CN217132447U

CN217132447U - Hydraulic torque wrench calibrating device

Info

Publication number: CN217132447U
Application number: CN202123393849.4U
Authority: CN
Inventors: 宋新潮; 徐峰; 吴中华; 李华栋
Original assignee: Avic Shaanxi Dongfang Aviation Instrument Co ltd
Current assignee: Avic Shaanxi Dongfang Aviation Instrument Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-08-05
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a hydraulic torque wrench calibrating device, wherein a bolt simulator is arranged at the input end of a sensor, and the bolt simulator comprises a square head bolt, two disc springs and a hexagon nut; the flaring of the two disk springs are abutted, and a round hole is arranged in the center of each disk spring and sleeved on the square head bolt through the round hole; the hexagonal nut is in threaded connection with the square-head bolt; the disk springs are extruded by the square-head bolts and the hexagon nuts, and an extrudable space is reserved between the two disk springs; the end of the square head bolt extends out of the hexagon nut. The utility model has the advantages that: due to the fact that the bolt simulation device is arranged, the movement of the bolt can be well simulated in the detection process, and the fact that the detection of the hydraulic torque wrench is closer to an actual torque value is further guaranteed. A step-type stop block assembly is further arranged, and a reliable reaction arm is provided for the wrench rods with different sizes.

Description

Hydraulic torque wrench calibrating device

Technical Field

The utility model belongs to torque wrench check out test set specifically is a hydraulic torque wrench calibrating installation.

Background

In order to complete the detection of the accuracy of the output torque of the hydraulic torque wrench, the technology and products of a hydraulic torque wrench calibrator are available, such as the hydraulic torque wrench calibrator named as patent No. CN201289421Y applied by my company. The existing hydraulic torque wrench calibrator mainly comprises a digital display instrument, a shell, a torque sensor, an adapter, a reaction arm stop block, a bottom plate and the like. Although the existing detector can detect, the actual torque value of the hydraulic torque wrench cannot be obtained due to the defects of the structure. The specific reasons are that: the torque sensor adopted by the detector is a static torque sensor, and a measuring elastic body of the static torque sensor cannot participate in relative movement. When detecting hydraulic torque spanner, static torque sensor is fixed on the casing, and hydraulic torque spanner is fixed after the square tenon or the hexagonal mouth as the output cooperates with static sensor's interface, can not rotate. Thus, when the hydraulic torque wrench is loaded and detected, the position of the piston in the hydraulic torque wrench is fixed in the loading process. When the hydraulic torque wrench loads the bolt, the piston needs to stretch and move in the oil cylinder, and the piston drives the ratchet driving mechanism to output torque. In such a mechanism, the magnitude of the torque output is affected by the position of the piston at the same pressure. Within the range of piston stroke, the torque output variation range can reach +/-10% -15%. It is generally the case that the torque value output by the piston at the starting position is minimal; the piston is near the middle of the stroke, and the output torque value is the largest.

In a production line, bolts are usually broken, and the detection result of the hydraulic torque wrench is qualified. The fundamental reason is that the existing detection equipment has defects, so that the piston position of the hydraulic torque wrench is fixed during pressurization detection, and the piston is easily in the initial position, so that the detected output torque value is minimum. And users often use this torque value as the output value of the hydraulic torque wrench. In practical use, because the bolt or the nut loaded by the hydraulic torque wrench is rotatable, the torque value gradually increases to the maximum value along with the extending process of the piston in the loading process, so that the allowable torque value of the bolt can be easily exceeded to damage the bolt.

Disclosure of Invention

In view of this, the utility model provides a hydraulic torque wrench calibrating installation obtains the testing result that is closest with actual torque value through simulating hydraulic torque wrench to the true loading process of bolt, has solved original check out test set structural defect and has caused the unsafe problem of result.

The utility model adopts the technical proposal that: a hydraulic torque wrench calibrating device comprises a shell, a sensor arranged in the shell and a reaction arm component arranged on the shell, wherein the output end of the sensor is connected with an external digital display instrument through a cable; the method is characterized in that: the input end of the sensor is provided with a bolt simulation device, and the bolt simulation device comprises a square head bolt, two disc springs and a hexagon nut; the flaring of the two disk springs are abutted, and a round hole is arranged in the center of each disk spring and sleeved on the square head bolt through the round hole; the hexagonal nut is in threaded connection with the square-head bolt; the disk springs are extruded by the square-head bolts and the hexagon nuts, and an extrudable space is reserved between the two disk springs; the end of the square head bolt extends out of the hexagon nut.

Furthermore, the height of the end of the square-head bolt extending out of the hexagon nut is L, one thread pitch of the thread of the square-head bolt is P, and L is less than or equal to P.

Furthermore, the height of the extrusion space of the disc spring is h, and h is more than or equal to P.

Further, the reaction arm assembly is a stepped stop block assembly and comprises a fixed seat and a stepped stop block, the fixed seat comprises a cylinder fixed at the upper end of the square body, and the bottom end of the square body is fixedly connected with the shell; the through hole in the center of the stepped stop block is sleeved outside the cylinder of the fixed seat to form clearance fit; the outer contour of the stepped stop block comprises one section of circular arc and more than two steps, the circular arc is concentric with the through hole, the distance between the plane of the adjacent steps and the center of the through hole is increased and distributed, and the connecting line between the step plane and the center of the through hole is perpendicular to the step plane.

Further, the lengths of the step planes are the same.

Furthermore, the stepped stop block assembly is also provided with an adjusting cushion block. The adjusting cushion block is an L-shaped plate, and the width of the adjusting cushion block is matched with the length of the step plane.

Furthermore, a sleeve is sleeved on the hexagon nut, one end of the sleeve is a hexagonal opening, and the other end of the sleeve is a square opening.

The utility model has the advantages that: due to the fact that the bolt simulation device is arranged, the movement of the bolt can be well simulated in the detection process, and the fact that the detection of the hydraulic torque wrench is closer to an actual torque value is further guaranteed. A step-type stop block assembly is further arranged, and a reliable reaction arm is provided for the wrench rods with different sizes.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the middle bolt simulator of the present invention.

Fig. 3 is a schematic structural view of a square head bolt.

Fig. 4 is an assembly view of the stepped stopper assembly.

Fig. 5 is a schematic structural diagram of the fixing base.

Fig. 6 is a schematic view of a stepped stopper.

Fig. 7 is a schematic view of the structure of the adjusting pad.

Fig. 8 is a schematic diagram of the detection of the driving hydraulic torque wrench of the present invention.

Fig. 9 is a schematic diagram of the detection of the hollow hydraulic torque wrench according to the present invention.

In the figure: 1. the digital display instrument comprises a digital display instrument body, 2 parts of a shell, 3 parts of a sensor, 4 parts of a bolt simulation device, 4-1 parts of a hexagon nut, 4-2 parts of a disc spring, 4-3 parts of a square head bolt, 4-4 parts of a baffle table, 5 parts of a sleeve, 6 parts of a stepped stop block assembly, 6-1 parts of a fixed seat, 6-2 parts of a stepped stop block, 6-3 parts of an adjusting cushion block, 7 parts of a cable, 8 parts of a driving type hydraulic torque wrench, 9 parts of a hollow type hydraulic torque wrench.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the utility model discloses a sensor 3 of installing in casing 2 and install the reaction arm subassembly on casing 2, the output of sensor 3 passes through cable 7 and is connected with outside digital display 1. The structure is a common structure of the calibrating apparatus, and is not described herein in detail.

The utility model discloses a focus is on, adds a bolt analogue means 4 at sensor 3's input to this true state that simulates hydraulic torque wrench when screwing up the bolt. Under the detection environment, the hydraulic torque wrench is detected, and a more real torque value can be obtained. The concrete structure of the bolt simulator 4 is as follows:

as shown in fig. 2, the bolt simulator 4 includes a square head bolt 4-3, two disc springs 4-2, and a hexagonal nut 4-1. As shown in FIG. 3, the square head bolt 4-3 comprises a square head and a section of bolt, and a stop 4-4 is arranged between the square head and the bolt. The shape of the square head is matched with the shape of the input end of the sensor 3. The square head can be plugged into the input end of the sensor 3. The centers of the two disk springs 4-2 are provided with round holes. The flaring of the two disk springs 4-2 are abutted and sleeved on the bolt through a round hole. The diameter of the upper baffle table 4-4 of the square head bolt 4-3 is larger than that of the round hole of the disc spring 4-2. The hexagon nut 4-1 is screwed on the bolt extending out of the round hole of the disc spring 4-2. The lower end of the disk spring 4-2 is propped against the baffle table 4-4, and the upper end of the disk spring 4-2 is propped against the hexagonal nut 4-1. Screwing the hexagon nut 4-1 can extrude the two disk springs 4-2 to the baffle table 4-4.

It should be noted that: the height L of the end of the bolt exceeding the hexagon nut 4-1 is less than or equal to one thread pitch P of the thread on the bolt. After the bolt simulator 4 bears the test torque load, the total compression h of the belleville spring meets the condition that h is more than or equal to P. This is because: the maximum angle that the piston can push the nut to rotate each time is not more than 40 degrees, which is limited by the size of the ratchet mechanism in the hydraulic torque wrench and the stroke of the piston. For a hydraulic torque wrench, detection of an accurate torque value requires that the piston perform at least 3 reciprocations until the nut can no longer rotate. That is, the nut needs to be rotated 120 °. Corresponding to the utility model discloses an on the bolt simulator, a pitch P is equivalent to hexagon nut 4-1 and rotates 360. When the hydraulic torque wrench is loaded with torque for more than 3 times, the hexagonal nut 4-1 should be rotated at least by an angle phi of 120 deg. Therefore, the compression amount of the disc spring 4-2 should satisfy h.gtoreq.P.

As shown in fig. 8, when the driving hydraulic torque wrench 8 is detected, a socket 5 is required to be sleeved on the hexagon nut 4-1 of the bolt simulator 4, one end of the socket 5 is a square opening, and the other end is a hexagon opening. The wrench head of the driving hydraulic torque wrench is connected with the square opening of the sleeve 5, and the hexagonal opening of the sleeve 5 is connected with the hexagon nut 4-1 on the bolt simulation device 4.

As shown in fig. 9, when the hollow hydraulic torque wrench 9 is detected, the wrench head is directly sleeved on the hexagon nut 4-1 of the bolt simulator 4 without adding the sleeve 5.

As shown in fig. 4 to 6, in order to match hydraulic torque wrenches with different arm lengths, the original reaction arm stopper on the housing 2 is modified to be a stepped stopper assembly 6. The step-type stop block assembly 6 comprises a fixed seat 6-1 and a step-type stop block 6-2. The fixed seat 6-1 is fixedly connected with the shell 2, and the stepped stop 6-2 is sleeved on the fixed seat 6-1. The concrete structure is as follows:

as shown in fig. 5, the fixing base 6-1 is composed of a cylinder and a square. The bottom of the square body is fixedly connected with the shell 2 through a locking bolt, and the cylinder is fixed at the top end of the square body. The central axis of the cylinder coincides with that of the square.

As shown in fig. 6, the stepped stopper 6-2 is a cylindrical member. The center of the stepped stop block 6-2 is provided with a through hole, and the aperture of the through hole is matched with the outer diameter of the cylinder of the fixed seat 6-1. The stepped stop 6-2 is sleeved on the cylinder of the fixed seat 6-1 through the through hole to form clearance fit. The outer contour of the step-shaped stop block 6-2 comprises a section of circular arc and more than two steps. As one example, the number of steps may be set to 5. The arc is concentric with the through hole. The distances between the planes of the adjacent steps and the center of the through hole are distributed in an equidifferent and increasing mode. The connecting line of the step plane and the center of the through hole is vertical to the step plane. The length K of each step plane is the same.

As shown in fig. 7, the stepped stopper assembly 6 is further provided with a setting block 6-3. The adjusting cushion block 6-3 is an L-shaped plate-shaped object. The width of the adjusting cushion block 6-3 is matched with the length K of the step plane. When in use, the adjusting cushion block 6-3 is hung on the step surface of the step-shaped stop block 6-2. The replacement position can be removed at any time.

When the stepped stop block assembly 6 is used, the stepped stop block is sleeved on the cylinder of the fixed seat 6-1. As shown in fig. 8 and 9, the wrench head of the hydraulic torque wrench is connected to the bolt simulator 4, and the wrench rod abuts against one of the stepped planes of the stepped stoppers 6-2, so that the stepped plane is parallel to the stress surface of the wrench rod, and a reliable reaction force can be provided for the hydraulic torque wrench. The stepped plane and the stress surface of the wrench rod can be adjusted to be parallel by rotating the position of the stepped stop block 6-2 on the cylinder. The wrench rods with different sizes can realize the parallel offset of the ladder plane and the stress surface of the wrench rod by replacing the ladder plane at different positions or increasing the means of adjusting the cushion blocks 6-3.

It should be noted that, after the hydraulic torque wrench is detected, the bolt simulator 4 needs to be unloaded to restore the deformation amount of the belleville spring to the initial state.

The utility model discloses owing to set up bolt analogue means 4, can be in the motion of the fine simulation bolt of testing process, and then guaranteed that hydraulic torque wrench's detection is closer to actual torque value. A step-shaped stop block assembly 6 is further arranged, and a reliable reaction arm is provided for the wrench rods with different sizes.

Claims

1. A hydraulic torque wrench calibrating device comprises a shell, a sensor arranged in the shell and a reaction arm component arranged on the shell, wherein the output end of the sensor is connected with an external digital display instrument through a cable; the method is characterized in that: the input end of the sensor is provided with a bolt simulation device, and the bolt simulation device comprises a square head bolt, two disc springs and a hexagon nut; the flaring of the two disk springs are abutted, and a round hole is arranged in the center of each disk spring and sleeved on the square head bolt through the round hole; the hexagonal nut is in threaded connection with the square-head bolt; the disk springs are extruded by the square-head bolts and the hexagon nuts, and an extrudable space is reserved between the two disk springs; the end of the square head bolt extends out of the hexagon nut.

2. A hydraulic torque wrench calibrating device as claimed in claim 1, wherein: the height of the end of the square head bolt extending out of the hexagon nut is L, one thread pitch of the thread of the square head bolt is P, and the L is required to be less than or equal to P.

3. A hydraulic torque wrench calibrating device as claimed in claim 2, wherein: the height of the extrusion space of the disc spring is h, and h is more than or equal to P.

4. A hydraulic torque wrench calibrating device as claimed in claim 1, wherein: the reaction arm assembly is a stepped stop block assembly and comprises a fixed seat and a stepped stop block, the fixed seat comprises a cylinder fixed at the upper end of a square body, and the bottom end of the square body is fixedly connected with the shell; the through hole in the center of the stepped stop block is sleeved outside the cylinder of the fixed seat to form clearance fit; the outer contour of the stepped stop block comprises one section of circular arc and more than two steps, the circular arc is concentric with the through hole, the distance between the plane of the adjacent steps and the center of the through hole is increased and distributed, and the connecting line between the step plane and the center of the through hole is perpendicular to the step plane.

5. A hydraulic torque wrench calibrating device as claimed in claim 4, wherein: the length of the step planes is the same.

6. A hydraulic torque wrench calibrating device as claimed in claim 4, wherein: the stepped stop block assembly is also provided with an adjusting cushion block; the adjusting cushion block is an L-shaped plate, and the width of the adjusting cushion block is matched with the length of the step plane.

7. A hydraulic torque wrench calibrating device as claimed in claim 1, wherein: the hexagonal nut is sleeved with a sleeve, one end of the sleeve is a hexagonal opening, and the other end of the sleeve is a square opening.