CN214621585U - Torque wrench detection device - Google Patents
Torque wrench detection device Download PDFInfo
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- CN214621585U CN214621585U CN202121161118.4U CN202121161118U CN214621585U CN 214621585 U CN214621585 U CN 214621585U CN 202121161118 U CN202121161118 U CN 202121161118U CN 214621585 U CN214621585 U CN 214621585U
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Abstract
The utility model discloses a torque wrench detection device, which comprises a fixed outer sleeve and a rotary inner sleeve component arranged inside the fixed outer sleeve, wherein an elastic component is arranged inside the rotary inner sleeve component, and a rotary lifting component matched with a torque wrench is assembled on the top thread of the rotary inner sleeve component; the lower part of the elastic component is provided with a force transmission sleeve, the bottom end of the force transmission sleeve is provided with a lifting loading mechanism, a torque sensor is arranged in the force transmission sleeve, and a torque transmission component is assembled in the rotary inner sleeve component and the force transmission sleeve in a sliding mode. The utility model discloses with torque sensor setting in the inside that passes power cover to transmit the moment of torsion of rotatory lift subassembly to torque sensor through moment of torsion transmission subassembly, and the moment of torsion sensor passes the turn round and does not pass power, and lift loading mechanism can not exert an influence to torque sensor when carrying out the loading to elastic component, need not to install, dismantle torque sensor when the moment of torsion detects, and it is very convenient to detect, has improved the detection precision widely.
Description
Technical Field
The utility model relates to a torque wrench detection device technical field, more specifically relates to a torque wrench detection device.
Background
Torque wrenches are widely used for assembling and maintaining threaded fasteners, such as bolt and nut connections, that are tightened or loosened during mechanical work. For high precision machines, the threaded fasteners must be tightened or loosened according to a prescribed operational sequence at a preset level of torque. An improper manual operating torque may inadvertently cause damage or destruction of the threaded fastener or threaded bore, and thus may result in damage to machine function and operating accuracy. In the long-term frequent use process of the torque wrench, the preset torque value may change, and the torque wrench needs to be periodically checked and calibrated through a torque wrench detection device.
The invention discloses a bolt simulator structure, which comprises a base and a transmission bolt, wherein a vertical inner hole is formed in the base, a piston capable of sliding relatively is arranged in the inner hole, a sealed oil pressure cavity is formed between the piston and the inner hole, the transmission bolt acts on the upper end of the piston to drive the piston to move axially, an oil duct communicated with the oil pressure cavity is arranged on the base, the oil duct is connected with a counter-force device, and the counter-force device provides a counter-acting force for the oil pressure cavity. The torque wrench sleeve is connected with a transmission bolt of the simulator. Although the torque detection of the torque wrench can be realized, when the torque detection is carried out, the torque sensor needs to be connected to a torque plate sleeve of the torque wrench, if the torque sensor is connected insecurely, the detection precision is affected, and the torque sensor needs to be mounted and dismounted once when the torque is detected every time, so that time and labor are wasted; in addition, the torque sensor is exposed to the atmosphere, and external dust is easily deposited on the surface of the torque sensor.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a torque wrench detection device to solve at every turn moment of torsion and examine time measuring all need carry out torque sensor's installation, dismantlement, and the problem that wastes time and energy, with need not to install, dismantle torque sensor when the moment of torsion detects, improve and detect the precision.
In order to solve the technical problem, the utility model adopts the following technical proposal.
The torque wrench detection device comprises a fixed outer sleeve and a rotary inner sleeve assembly arranged in the fixed outer sleeve, wherein an elastic assembly is arranged in the rotary inner sleeve assembly, and a rotary lifting assembly which is assembled with the torque wrench and used for extruding the elastic assembly during rotation is assembled at the top end of the rotary inner sleeve assembly through threads; the torque transmission device is characterized in that a force transmission sleeve capable of extruding the elastic assembly is arranged below the elastic assembly, a lifting loading mechanism capable of lifting and preloading the elastic assembly is arranged at the bottom end of the force transmission sleeve, a torque sensor is arranged in the force transmission sleeve, and a torque transmission assembly used for transmitting the torque of the rotary lifting assembly to the torque sensor is assembled in the rotary inner sleeve assembly and the force transmission sleeve in a vertically sliding mode.
Further optimize technical scheme, rotatory inner skleeve subassembly is including rotating spiral sleeve and the dish spring sleeve that sets up fixed connection between fixed overcoat is inside in proper order, and spiral sleeve and the telescopic inside intercommunication setting of dish spring offer the internal thread on spiral sleeve's the inside wall.
According to the technical scheme, the rotary lifting assembly comprises a rotary bolt which is arranged inside the spiral sleeve in a threaded fit mode.
Further optimize technical scheme, elastic component is the dish spring group of setting in dish spring sleeve inside.
According to the technical scheme, the torque transmission assembly comprises a push rod arranged between the elastic assembly and the torque sensor; the ejector rod comprises an ejector rod big head which is assembled in the disc spring sleeve in a sliding mode up and down and is contacted with the elastic component, and an ejector rod small head which is integrally connected and arranged below the ejector rod big head, the bottom end of the ejector rod small head has a certain distance with the torque sensor, a square hole is formed in the bottom end of the ejector rod small head, and a square shaft arranged in the square hole is arranged at the bottom end of the torque sensor; the top end of the force transmission sleeve is contacted with the big end of the ejector rod.
According to the technical scheme, the outer side wall of the large end of the ejector rod is vertically provided with a plurality of guide keys, and the inner side wall of the disc spring sleeve is vertically provided with a plurality of guide grooves which are respectively matched with the guide keys.
According to the technical scheme, the lifting loading mechanism comprises a top disc fixedly arranged at the bottom end of the force transmission sleeve and a hydraulic cylinder with a piston rod end fixed with the bottom end of the top disc, a small end of a mandril is arranged in the force transmission sleeve in a sliding assembly mode, and the torque sensor is arranged in the force transmission sleeve through a sensor fixing seat fixed with the top disc.
According to the technical scheme, the spiral sleeve and the disc spring sleeve are rotatably arranged in the fixed outer sleeve through bearings embedded in the fixed outer sleeve.
Further optimize technical scheme, the top fixed mounting of fixed overcoat has the end cover.
Further optimize technical scheme, the lateral wall of biography power cover is seted up rectangular observation hole.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
1. Rolling replaces fixing, and high-precision measurement is realized: through the setting of angular contact ball bearing, guaranteed to have the rotational degree of freedom between rotatory lift subassembly and the fixed overcoat, realized the dynamic measurement of bolt moment of torsion, avoided the measuring result to receive great sliding friction's influence for measurement accuracy is higher.
2. And (3) dynamic and static combination to realize out-of-phase measurement: the rotating bolt can rotate 720 degrees, the phase must be dynamically changed, the torque sensor measures statically with high precision, and the phase cannot be changed; the separation of loading and measurement of the upper part and the lower part is realized through the arrangement of the double guide keys.
3. Torque transmission and force non-transmission of the torque sensor: the arrangement of the double guide keys and the upper hole of the top column ensures the axis movement freedom degree of the torque sensor, so that the torque sensor is not influenced by axial force when accurately measuring torque, and the influence of axial loading on the torque sensor is avoided when realizing high-precision measurement.
4. The circumference is uniformly loaded, and the rigidity and balance are ensured: the thrust of the hydraulic cylinder is transferred to the disc spring group by the force transfer sleeve, so that the rigidity is good and the balance is high; the torque sensor is arranged inside the force transmission sleeve, so that the interference and the damage of external force are avoided.
5. The combination of many specifications butterfly spring guarantees that the multirange matches: more than three specifications of butterfly springs are adopted to form a butterfly spring group, and the load of the butterfly spring group is adjusted by adjusting the thrust of a hydraulic cylinder so as to meet the requirements of different measuring ranges.
The utility model discloses with torque sensor setting in the inside that passes power cover to transmit the moment of torsion of rotatory lift subassembly to torque sensor through moment of torsion transmission subassembly, and the moment of torsion sensor passes the turn round and does not pass power, and lift loading mechanism can not exert an influence to torque sensor when carrying out the loading to elastic component, consequently need not to install torque sensor, dismantle when the moment of torsion detects, and it is very convenient to detect, has improved the detection precision widely.
The utility model discloses it is very convenient that lift loading mechanism is to elastic component's loading, only needs the piston rod extension effect through the pneumatic cylinder to realize to can adjust elastic component's load, with the requirement of realizing different ranges.
The utility model discloses the dress setting is joined in marriage inside the dish spring sleeve to the ejector pin major part is slided from top to bottom to contact with elastic component. The small end of the ejector rod is integrally connected and arranged below the large end of the ejector rod, and a certain distance is reserved between the bottom end of the ejector rod and the torque sensor. The square hole has been seted up to the bottom of ejector pin microcephaly, and torque sensor's bottom is provided with the square shaft, and the square shaft setting is inside the square hole, and ejector pin and torque sensor pass through the square hole and the square shaft cooperation, when guaranteeing that both the phase place is the same, can realize the relative micro displacement of axial again.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a cut-away view of the present invention;
fig. 3 is a top view of the present invention;
fig. 4 is a sectional view taken along line a-a of fig. 3 according to the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3 according to the present invention
Fig. 6 is a partially exploded view of the present invention.
Wherein: 1. the device comprises a fixed outer sleeve, 2, a rotary lifting component, 21, a rotary bolt, 22, a positioning groove, 3, an elastic component, 31, a disc spring group, 4, a lifting loading mechanism, 41, a hydraulic cylinder, 42, a top disc, 43, a force transmission sleeve, 44, a long strip observation hole, 5, a torque transmission component, 51, a top rod, 511, a small top rod head, 512, a large top rod head, 52, a guide key, 53, a guide groove, 54, a square hole, 55, a square shaft, 6, a rotary inner sleeve component, 61, a spiral sleeve, 62, a disc spring sleeve, 7, a torque sensor, 71, a sensor fixing seat, 8, a bearing, 81, a first angular contact bearing, 82, a second angular contact bearing, 9, an end cover, 91 and a lifting lug.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The torque wrench detection device, as shown in fig. 1 to 6, includes a fixed outer sleeve 1, a rotating inner sleeve assembly 6, an elastic assembly 3, a rotating lifting assembly 2, a force transmission sleeve 43, a lifting loading mechanism 4, a torque sensor 7, and a torque transmission assembly 5.
The fixed outer sleeve 1 is positioned on a workbench of the box body through screws, a flange plate is arranged at the top end of the fixed outer sleeve 1, and the fixed outer sleeve 1 is arranged in a stepped hole shape.
The inner rotating sleeve assembly 6 is rotatably arranged inside the fixed outer sleeve 1, the elastic assembly 3 is arranged inside the inner rotating sleeve assembly 6, and the top end of the inner rotating sleeve assembly 6 is provided with the rotating lifting assembly 2 in a threaded mode. The rotating lifting assembly 2 is fitted with a torque wrench for being able to squeeze the elastic assembly 3 when turned. The inner rotating sleeve assembly 6 is capable of slight rotation when the rotating lift assembly 2 is rotated.
Rotatory inner skleeve subassembly 6 is including rotating spiral sleeve 61 and the dish spring sleeve 62 that sets up in fixed overcoat 1 inside in proper order, adopts screw fixed connection between the bottom face of spiral sleeve 61 and the top face of dish spring sleeve 62, and the inside intercommunication setting of spiral sleeve 61 and dish spring sleeve 62 has seted up the internal thread on the inside wall of spiral sleeve 61.
The spiral sleeve 61 and the disc spring sleeve 62 are rotatably disposed in the fixed housing 1 through bearings 8 fitted in the fixed housing 1. The screw sleeve 61 is rotatably arranged in the fixed housing 1 via a first angular contact bearing 81, and the disc spring sleeve 62 is rotatably arranged in the fixed housing 1 via a second angular contact bearing 82. The utility model discloses in the cooperation of the outer face of cylinder of first angular contact bearing 81 and second angular contact bearing 82 and spiral sleeve 61 and dish spring sleeve 62 that sets up, guaranteed that rotatory inner skleeve subassembly 6 has the degree of freedom that can wind 1 central line relative rotation of fixed overcoat, guarantee that the friction between fixed overcoat and the rotatory inner skleeve subassembly is rolling friction, and the utility model provides a rotatory inner skleeve subassembly 6 can transmit the friction torque between rotatory bolt 21 and the spiral sleeve 61 for ejector pin 51.
The rotary lifting assembly 2 comprises a rotary bolt 21 which is arranged in the spiral sleeve 61 in a threaded fit mode, an external thread is arranged on the outer surface of the rotary bolt 21, and the rotary bolt 21 and the thread on the inner side of the spiral sleeve 61 are matched to form a spiral pair. The rotary bolt 21 is a left-hand screw or a right-hand screw. The top end of the rotary bolt 21 extends out of the box body 12, a positioning groove 22 is formed in the top end face of the rotary bolt 21, and the positioning groove 22 is used for positioning the end portion of the torque wrench.
The elastic component 3 is a disc spring set 31 disposed inside the disc spring sleeve 62, and the disc spring set 31 can be deformed by the pressing of the rotary bolt 21. When the rotary bolt 21 is moved axially downward, the disc spring assembly is pressed and generates a reaction force.
The lifting loading mechanism 4 capable of lifting and preloading the elastic component 3 is arranged below the elastic component 3, and the lifting loading mechanism 4 can preload the elastic component 3 differently, so that the load of the elastic component 3 can be adjusted to meet the requirements of different ranges.
According to the design requirement, the rotating bolt 21 needs to rotate 720 degrees, namely two circles, to achieve the required friction torque. At the same time, the rotary bolt 21 can be preloaded by the hydraulic cylinder, reducing the axial displacement. It is required to transmit torque to the torque sensor while the rotation bolt 21 is rotated. Therefore, the utility model discloses be provided with torque sensor 7 in the inside of biography power cover 43, the slip is furnished with moment of torsion transmission subassembly 5 about rotatory inner skleeve subassembly 6 and lift loading mechanism 4's inside, and moment of torsion transmission subassembly 5 is used for transmitting the moment of torsion of rotatory elevating assembly 2 to torque sensor 7.
The torque transmission assembly 5 comprises a push rod 51 arranged between the elastic assembly 3 and the torque sensor 7. The ram 51 includes a ram large head 512 and a ram small head 511. The ejector pin big head 512 is arranged in the disc spring sleeve 62 in a vertically sliding fit mode and is in contact with the elastic component 3. The small mandril head 511 is integrally connected and arranged below the big mandril head 512, and the bottom end of the small mandril head 511 has a certain distance with the torque sensor 7. The square hole 54 has been seted up to the bottom of ejector pin stub 511, and torque sensor 7's bottom is provided with square shaft 55, and square shaft 55 sets up inside square hole 54, and ejector pin 51 and torque sensor 7 pass through the square hole and the square shaft cooperation, when guaranteeing that both the looks phase place is the same, can realize the relative micro displacement of axial again.
The outer side wall of the ejector rod big head 512 is vertically provided with a plurality of guide keys 52, the inner side wall of the disc spring sleeve 62 is vertically provided with a plurality of guide grooves 53 which are respectively assembled with the guide keys 52, and the guide keys 52 and the guide grooves 53 are matched to form a sliding pair.
The force transmission sleeve 43 is in a conical cylinder shape with the inner diameter gradually reduced from top to bottom, a force transmission sleeve flange plate is integrally arranged at the bottom end of the force transmission sleeve 43 and installed on the top plate 42, and the top end of the force transmission sleeve 43 is in contact with the bottom end face of the large head 512 of the ejector rod and can extrude the elastic component 3. Therefore, when the piston rod of the hydraulic cylinder extends, the force transmission sleeve 43 transmits the thrust of the hydraulic cylinder to the top pillar 51, and the torque sensor 7 can be effectively prevented from being subjected to axial force.
The side wall of the force transmission sleeve 43 is provided with a long-strip observation hole 431, so that the displayed numerical value of the torque sensor 7 can be observed conveniently, and transparent glass can be arranged at the long-strip observation hole 431 to play a role in dust prevention.
The elevating and loading mechanism 4 includes a top plate 42 and a hydraulic cylinder 41.
The top disk 42 is fixedly arranged at the bottom end of the force transmission sleeve 43 and is fixed with the force transmission sleeve 43 by screws.
The piston rod end of the hydraulic cylinder 41 is fixed with the bottom end of the top disk 42, the small top rod head 511 is arranged in the force transmission sleeve 43 in a sliding fit mode, and the torque sensor 7 is arranged in the force transmission sleeve 43 through a sensor fixing seat 71 fixed with the top disk 42. The sensor fixing seat 71 is provided with a rectangular through hole, the bottom end of the torque sensor 7 is fixedly provided with a connector extending into the rectangular through hole, the side walls of the sensor fixing seat 71 and the connector are respectively provided with a connecting hole, and the sensor fixing seat 71 and the torque sensor 7 are fixed through a screw penetrating through the connecting hole. A certain distance is provided between the bottom end surface of the torque sensor 7 and the top end surface of the sensor fixing seat 71.
An end cover 9 is fixedly arranged at the top end of the fixed outer sleeve 1 and used for limiting the axial displacement of the angular contact ball bearing. A pair of lifting lugs 91 is fixedly arranged at the top end of the end cover 9.
The utility model discloses a high-speed torque measurement instrument of sampling frequency more than 1600 times/second, high measurement frequency dynamic torque sensor uses 1600 times/second's measuring instrument as an example, if pneumatic torque wrench's rotational speed is 60 revolutions per minute, reach 100% rotation angle from 10% according to the power value and be 27, 0.075 seconds of time spent, so torque measurement instrument has gathered 120 data in 0.075 seconds, theoretically every 1 times data force value of gathering changes 0.75 of nominal value. The higher the acquisition frequency, the slower the rotational speed of the torque wrench, and the more accurate the measured data.
The utility model discloses certain pressure is applyed in advance to pneumatic cylinder 41, with the certain stroke of dish spring group compression. Assuming that a 200 N.M torque wrench is detected, under the condition of hard connection, a bolt rotates 27 degrees under a fixed bolt pitch, the downward pressing displacement is a fixed value X0, and the deformation generated by stress of a selected disc spring group is in a linear relation with the magnitude of a force value, on the two bases, the disc spring can be compressed to a displacement value X1 in advance, then the torque wrench applies a load to 200 N.M, the disc spring is compressed to a displacement value X2, the force applied by the torque value is balanced with the force of the disc spring, and X1+ X0 is X2.
The utility model discloses the process of detecting torque wrench is as follows.
S1, the disc spring group 31 is loaded in advance by the elevation loading mechanism 4. The piston rod of the hydraulic cylinder 41 extends to generate thrust on the top disc 42 and the force transmission sleeve 43, and because the top end of the force transmission sleeve 43 directly contacts with the bottom end of the ejector rod big head 512 and a certain distance is reserved between the bottom end surface of the torque sensor 7 and the top end surface of the sensor fixing seat 71, the force transmission sleeve 43 directly transmits the thrust of the hydraulic cylinder to the ejector rod big head 512, and then the ejector rod big head 512 transmits the thrust to the disc spring group 31 to extrude the disc spring group 31. In the process, the thrust of the hydraulic cylinder cannot be transmitted to the torque sensor 7, and the torque sensor 7 is protected to a certain extent.
S2, the rotation bolt 21 is rotated by 720 ° or more, that is, two or more turns, the rotation bolt 21 presses the disc spring set 31 again, friction is generated between the rotation bolt 21 and the spiral sleeve 61, and the disc spring sleeve 62 is connected to the push rod 51 by the guide key 52, so that the inner rotation sleeve assembly 6 can transmit the friction torque between the rotation bolt 21 and the spiral sleeve 61 to the push rod 51, the push rod 51 transmits the friction torque to the torque sensor 7, and the torque sensor 7 measures the torque.
Claims (10)
1. Torque wrench detection device, its characterized in that: the device comprises a fixed outer sleeve (1) and a rotary inner sleeve assembly (6) arranged in the fixed outer sleeve (1), wherein an elastic assembly (3) is arranged in the rotary inner sleeve assembly (6), and a rotary lifting assembly (2) which is assembled with a torque wrench and used for extruding the elastic assembly (3) during rotation is assembled at the top end of the rotary inner sleeve assembly (6) through threads; the device is characterized in that a force transmission sleeve (43) capable of extruding the elastic assembly (3) is arranged below the elastic assembly (3), a lifting loading mechanism (4) capable of lifting and preloading the elastic assembly (3) is arranged at the bottom end of the force transmission sleeve (43), a torque sensor (7) is arranged inside the force transmission sleeve (43), and a torque transmission assembly (5) used for transmitting the torque of the rotary lifting assembly (2) to the torque sensor (7) is assembled inside the rotary inner sleeve assembly (6) and the force transmission sleeve (43) in a vertically sliding mode.
2. The torque wrench detection device of claim 1, wherein: rotatory interior sleeve subassembly (6) are including rotating spiral sleeve (61) and dish spring sleeve (62) that set up fixed connection between fixed overcoat (1) inside in proper order, and the inside intercommunication setting of spiral sleeve (61) and dish spring sleeve (62), set up on the inside wall of spiral sleeve (61) has the internal thread.
3. The torque wrench detection device of claim 2, wherein: the rotary lifting assembly (2) comprises a rotary bolt (21) which is arranged inside a screw sleeve (61) in a threaded fit.
4. The torque wrench detection device of claim 2, wherein: the elastic component (3) is a disc spring group (31) arranged in the disc spring sleeve (62).
5. The torque wrench detection device of claim 2, wherein: the torque transmission assembly (5) comprises a push rod (51) arranged between the elastic assembly (3) and the torque sensor (7); the ejector rod (51) comprises an ejector rod big head (512) which is arranged in the disc spring sleeve (62) in a vertically sliding fit mode and is in contact with the elastic component (3), and an ejector rod small head (511) which is integrally connected and arranged below the ejector rod big head (512) and has a certain distance between the bottom end and the torque sensor (7), a square hole (54) is formed in the bottom end of the ejector rod small head (511), and a square shaft (55) arranged in the square hole (54) is arranged at the bottom end of the torque sensor (7); the top end of the force transmission sleeve (43) is contacted with the big head (512) of the ejector rod.
6. The torque wrench detection device of claim 5, wherein: the outer side wall of the ejector rod big head (512) is vertically provided with a plurality of guide keys (52), and the inner side wall of the disc spring sleeve (62) is vertically provided with a plurality of guide grooves (53) which are respectively assembled with the guide keys (52).
7. The torque wrench detection device of claim 5, wherein: the lifting loading mechanism (4) comprises a top disc (42) fixedly arranged at the bottom end of the force transmission sleeve (43) and a hydraulic cylinder (41) with the piston rod end fixed with the bottom end of the top disc (42), a small ejector rod head (511) is arranged in the force transmission sleeve (43) in a sliding assembly mode, and the torque sensor (7) is arranged in the force transmission sleeve (43) through a sensor fixing seat (71) fixed with the top disc (42).
8. The torque wrench detection device of claim 2, wherein: the spiral sleeve (61) and the disc spring sleeve (62) are rotatably arranged in the fixed outer sleeve (1) through bearings (8) embedded in the fixed outer sleeve (1) respectively.
9. The torque wrench detection device of claim 2, wherein: the top end of the fixed outer sleeve (1) is fixedly provided with an end cover (9).
10. The torque wrench detection device of claim 1, wherein: the side wall of the force transmission sleeve (43) is provided with a long-strip observation hole (431).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121161118.4U CN214621585U (en) | 2021-05-27 | 2021-05-27 | Torque wrench detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121161118.4U CN214621585U (en) | 2021-05-27 | 2021-05-27 | Torque wrench detection device |
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| Publication Number | Publication Date |
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| CN214621585U true CN214621585U (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121161118.4U Active CN214621585U (en) | 2021-05-27 | 2021-05-27 | Torque wrench detection device |
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| CN (1) | CN214621585U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200768A (en) * | 2022-09-16 | 2022-10-18 | 运城飞华科技有限公司 | Detection equipment for detecting performance of hydraulic torque wrench |
-
2021
- 2021-05-27 CN CN202121161118.4U patent/CN214621585U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200768A (en) * | 2022-09-16 | 2022-10-18 | 运城飞华科技有限公司 | Detection equipment for detecting performance of hydraulic torque wrench |
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