Ⅰ.Purpose and characteristics

The JW series anchor rod pull-out instrument is developed and produced by our company, mainly used for anchor force testing of anchor rods, anchor cables, steel bars, expansion bolts and other anchoring components. It is an essential instrument for anchor rod construction support engineering testing.

The JW series anchor rod puller mainly consists of a manual pump, a hydraulic cylinder, an intelligent pressure numerical display, and a high-pressure oil pipe (accessory anchor, conversion joint) with a quick connector. When in use, first connect the manual pump to the hydraulic cylinder with a quick connector, and then connect the intelligent pressure numerical display to the pressure sensor on the manual pump through a sensor connection wire.

The performance characteristics of this instrument are as follows:

●Segmented LCD display
●LCD lighting function
●Peak holding function
●Can store up to 500 pieces of data
●Adopting an overload protection structure, the oil cylinder will not be damaged when the no-load exceeds the range, so you can use it with confidence.

◆According to standard: National Standard of the People's Republic of China
◆Design Code for Reinforcement of Concrete Structures (GB50367-2006)
◆Technical Specification for Post Anchorage of Concrete Structures (JGJ145-2013)


Ⅱ.Main technical parameters

ModelDiameter of the center hole of the oil cylinderCylinder strokeMeasuring rangeCylinder weightResolving power
JW-10 27mm60mm0-100 KN7kg0.01KN
JW-20 34mm80mm0-200KN13Kg
JW-30 45mm80mm0-300 KN15Kg
JW-50 60mm120mm0-500 KN29Kg
JW-60 75mm120mm0-600 KN35Kg
JW-100 86mm150mm0-1000 KN50Kg 0.1KN

Ⅲ.Operation steps

The schematic diagram of the JW-10-30 series anchor rod puller is as follows: 


The schematic diagram of the JW-50-100 series anchor rod puller is as follows: 


Install the high-pressure oil pipe of the sensor and connect it to the oil inlet, while the other oil pipe is connected to the oil outlet
When pressurizing, turn the directional valve to the pressurization position. When depressurization, turn the directional valve to the depressurization position

(1)Checking the oil level

If the hydraulic cylinder piston does not fully retract into the cylinder body, it should first be connected to the manual pump through an oil pipe. A 10-30 anchor rod puller should rotate the unloading valve on the pump body counterclockwise, and a 50-100 anchor rod puller should pull the directional valve to the pressure relief position, allowing the hydraulic oil in the hydraulic cylinder to be discharged back into the oil reservoir of the manual pump. Unscrew the oil cap from the rear of the manual pump and check the oil level. There should be 1/5 of space left in the oil storage tank. If the oil is not enough, N32 wear-resistant hydraulic oil can be added.


After the hydraulic system is connected, there is often air mixed in the oil reservoir, oil pipe, and hydraulic cylinder. To ensure the normal operation of the hydraulic system, this air must be discharged. Method: Loosen the oil injection hole cover to allow air to be discharged from the oil storage cylinder. Place the manual pump slightly higher than the hydraulic cylinder, tighten the unloading valve clockwise, press the manual pump to extend the hydraulic cylinder piston to its maximum stroke, then open the unloading valve to retract the piston, and repeat this process several times.

Ⅳ.Intelligent pressure numerical display parameters 

(1) The working principle and usage method of intelligent pressure numerical display
The JW-S3 series intelligent pressure numerical display mainly consists of pressure sensors and measurement display circuits, which are connected through data connection lines. The pressure sensor generates a voltage signal when subjected to force, which is converted into a digital signal through a 20 bit A/D converter. After being processed by a microcontroller, the pressure value is displayed on a liquid crystal display.
The panel of the intelligent pressure numerical display is shown in the following figure


(2) Key Function Description

图片17.pngPress this key in the main interface to enter the parameter setting state.

图片19.pngThere is a peak holding function in the measurement state and a value increasing function in the setting state.

图片15.pngStore the current measurement value and move the number to the right in the set state function 

图片18.pngValue reduction function. There is a display value reset function in the measurement state.

Press and图片8.pnghold this button for about 2 seconds to turn on/off the instrument power.

Ⅴ.Usage of intelligent pressure numerical display

Connect the sensor connection wire of the intelligent pressure numerical display to the sensor interface on the manual pump, and tighten the fastening ring on the connector
◆ Force value measurement

① After holding down the图片8.pngkey for 2 seconds, the instrument panel displays the startup screen (as shown in the following figure)


After 5 seconds, the instrument will automatically jump to the measurement state (as shown in the figure below)


First, press the key to图片19.pngenter the peak measurement state of the instrument, then press the图片18.pngkey to reset the displayed value of the instrument to zero and start pressurizing. The maximum value will be maintained at any time, making it convenient for you to read. (As shown in the figure below)


After the measurement is completed图片15.png, press the selection to save, and the instrument will automatically save the measurement results. This instrument can store 500 pieces of data, making it easier for users to store and protect data more effectively


◆ Data Query: Press the图片17.pngkey to query stored data, and图片18.pngview the previous or next data through the keys and


Press the图片17.pngkey twice again to return to measurement status
◆Data deletion: Press the图片17.pngkey twice


图片18.pngAfter pressing the button, the instrument panel will delete all saved data, the buzzer will sound once, and then return to the measurement status.

Ⅵ.Anchor rod detection

Connect the hydraulic cylinder to the tested anchor rod according to the diagram below. If the anchor rod is a threaded steel bar, refer to Figure A for connection. If the anchor rod is made of round steel with threads on the exposed part, it can be connected according to Figure B. JWMJ-1 type Φ 6~ Φ There are 14 types of anchors with 40 different specifications and various specifications of extension rods, which users can choose according to their actual needs.


Figure 1 Working diagram


1Tested anchor rod (threaded steel) 2. Hydraulic cylinder 3. Anchorage 4. Oil inlet (during loading) 5. Oil return port (limited to 50T and 100T only)
6 tested anchor rods (round steel) 7 nuts 8 extension rods
Figure 2 Working diagram

Tighten the unloading valve clockwise and slowly press the manual pump to extend the piston rod by about 10mm, in order to avoid图片18.pngWhen installing the anchor and striking the clip, the piston rod is damaged, which also brings convenience to the anchor removal. Install the anchor that matches the anchor and fix it reliably. Turn on the intelligent data processor and图片19.pngpress the "" button. A "peak" will appear in the upper right corner of the LCD screen, and then press the "" button to detect it. Evenly press the manual pump, increase the pressure until it reaches its maximum value, stop pressurizing, and the value displayed on the table is the maximum tensile strength of the steel bar. After use, turn off the processor. Loosen the unloading valve, and the piston can automatically retract back into the hydraulic cylinder. When necessary, you can tap the anchor ring of the anchor to make the clip fall off the anchor ring, and then remove the hydraulic cylinder.


1-The puller is strictly prohibited from being used for other tests unrelated to anchor rod testing.

2-The hydraulic system should be kept clean. After using the oil cylinder, the piston should be retracted and the inner and outer diameters of the piston rod should be regularly lubricated to prevent rust. The oil nozzle joint should be regularly paid attention to dust and collision prevention.

3-During the operation of the oil cylinder, the bottom must be leveled and placed stably, subjected to vertical force, and must not work beyond the stroke.

4-The oil added should be clean and free of impurities.

5-When conducting pull-out testing, it is strictly prohibited to stand around the oil cylinder and attention should be paid to safety

6-The oil storage pipe should be filled with clean N32 anti-wear hydraulic oil, and the amount of oil should not be too full, leaving 1/5 of the space.

Ⅶ.Common faults and troubleshooting methods

Fault phenomenonCause of malfunctionprocessing method
 Pressure gauge has no pressure display  Lack of oil in the oil cylinderOpen the oil filling valve to add oil

Unloading valve not tightenedTighten clockwise

Joint oil leakageTighten the joint

The manual pump is not placed horizontallyAfter leveling the water, apply pressure again

Pressure gauge damagedRemove for inspection or calibration
 Pressure cannot reachLack of oil in manual pumpcome on

Joint oil leakageCheck the joints and sealing rings

Incorrect oil quality or dirty oil usedOil change
Hydraulic cylinder oil leakageDamaged sealing ring inside the cylinder blockReplace the sealing ring
The pressure gauge reading has significantly decreasedSevere oil leakage at the jointTighten or replace the sealing ring

Sealing ring failureReplace the same type of sealing ring

The oil quality is too dirtyClean the oil cylinder, pump body oil pipe, and oil cylinder with kerosene before changing the oil

Poor sealing of all one-way valves inside the pump bodySend back to the factory for maintenance
The pressure gauge has a reading but the hydraulic cylinder has no pressureOil cylinder blockageUnblock the rubber hose

Joint blockageCleaning joints






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