CN220019178U - Positioning assembly and pressure testing device - Google Patents

Abstract

The utility model discloses a positioning assembly and a pressure testing device, and relates to the technical field of optical device detection equipment. The positioning structure comprises a movable clamping part, the positioning platform is provided with a feeding groove and a positioning groove, the clamping part is matched with the positioning groove to position the positioning platform, and the feeding groove is used for placing a light device. According to the utility model, the clamping part on the positioning structure is matched with the positioning groove on the placing platform, so that the placing platform can be more quickly fixed, the optical device can be more efficiently and accurately moved to the pressurizing position, and the pressurizing test efficiency of the optical device is improved.

Description

Positioning assembly and pressure testing device

Technical Field

The utility model belongs to the technical field of optical device detection equipment, and particularly relates to a positioning assembly and a pressure testing device.

Background

The pressure test of the optical device is an indispensable detection procedure in the production process, and is used for detecting whether the pressure which the optical device can bear meets the requirements. The pressure test generally applies a preset pressure with a specified value to the optical device by adopting a pressure structure, if the optical device is not damaged, the optical device meets the requirements, and if the optical device is damaged, the optical device is failed. When the pressure of the optical device is detected, the optical device is required to be positioned first, so that the pressurizing structure can pressurize the optical device directly, and the detecting structure is more accurate.

However, the optical device is small in size, and the length and width are usually in millimeter scale, so that the position accuracy is required when the optical device is placed. In order to improve the pressurizing efficiency, the interval between the pressurizing structure and the optical device in place is small, so that the pressurizing stroke is shortened, the pressurizing structure can contact the optical device in a shorter time, and the pressurizing efficiency is improved. The distance between the pressing structure and the placed optical device is small, and the optical device is blocked by the pressing structure, so that the optical device is difficult to be placed on the lower side of the pressing structure in a direct placement mode. And the small size of the optical device can lead to the difficulty that the optical device is accurately placed at the appointed pressurizing position at the lower side of the pressurizing structure, and the positioning efficiency of the optical device is low, so that the detection efficiency of the optical device is low.

Disclosure of Invention

The utility model aims to provide a positioning assembly and a pressure testing device, which are used for solving the problem of low positioning efficiency of an optical device.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model provides a locating component and pressure testing arrangement, includes location structure, place platform and slip subassembly, place the platform with slip subassembly is connected, location structure set up in place platform's slip path one side, location structure includes mobilizable screens portion, place the platform and be provided with feed chute and constant head tank, screens portion with the constant head tank cooperation realizes place the location of platform, the feed chute is used for placing the optical device.

When the placing platform slides to one side of the positioning structure, the position of the placing platform can be positioned by matching the clamping part with the positioning groove, so that the position of the optical device on the placing platform can be rapidly and accurately positioned. Under the combined action of the clamping part and the positioning groove, the optical device can be placed at other positions, and then can be rapidly and accurately moved to a pressurizing position for pressurizing test, so that the positioning efficiency of the optical device is improved, and the detection efficiency of the optical device is improved.

The positioning structure further comprises an elastic piece and a mounting block, wherein the elastic piece is connected with the mounting block, and the clamping part is connected with the elastic piece.

After the elastic piece and the mounting block are arranged, the clamping part and the positioning groove can be automatically matched by utilizing the elastic force of the elastic piece, and when the positioning groove moves to the position of the clamping part along with the placing platform, the elastic force of the elastic piece can enable the clamping part to be automatically clamped into the positioning groove, so that the positioning effect on the placing platform is completed.

The sliding assembly comprises a guide rail, a sliding block and a linear mechanism, wherein the sliding block is slidably connected with the guide rail, the placing platform is connected with the sliding block, and the linear mechanism is used for driving the sliding block to move.

The moving direction of the placing platform can be restrained by adopting the matching of the guide rail and the sliding block. The linear mechanism is used for providing power for the sliding block, so that the sliding block can slide on the guide rail, and the placing platform is driven to move along the guide rail.

The linear mechanism is an air cylinder, a screw rod, an oil cylinder or a clamp.

The linear mechanism may be electric, pneumatic, hydraulic or manual. Only the linear mechanism is required to drive the sliding block to move.

The end part of the guide rail is provided with a limiting part, and the limiting part is used for preventing the sliding block from being separated from the guide rail.

The stability of locating component can be improved to setting up spacing portion, and spacing portion forms the effect of blockking to the slider from the tip of guide rail, ensures that the slider can not follow the guide rail landing.

The limiting part is a limiting block, and the limiting block is provided with an adsorption structure.

After the detection of the optical device on the placing platform is completed, the placing platform needs to be moved out of the pressurizing position, so that the optical device is convenient to replace. The placing platform is moved to the position of the limiting part, so that the limiting part also plays a role in positioning, the optical devices are replaced at the same position, muscle memory is easier to form for manual replacement, and the replacement efficiency is improved; the replacement position of the optical device is fixed, so that the replacement of the optical device can be automated, and the replacement operation of the optical device is more convenient. The adsorption structure can further fix the placing platform, and the placing platform is prevented from moving in the replacement process. And under the combined action of the adsorption structure and the limiting part, the placing platform can be clung to the limiting part, so that the placing platform is more accurate in position.

The limiting part is of a buffer structure.

When the placing platform moves towards the pressurizing area, because the resistance of the clamping part is overcome, when the placing platform is pushed to move to the pressurizing area, larger pushing force is needed, the buffer structure can play a limiting role on the movement of the placing platform, the moving speed of the placing platform can not stop immediately when the placing platform collides with the buffer structure, the impact suffered by the placing platform can be slowed down, and therefore the light device is prevented from being separated from the feeding groove. Avoiding the loss or damage of the optical device.

The pressure testing device comprises the positioning assembly, a mounting bracket and a pressurizing structure, wherein the positioning assembly and the pressurizing structure are both connected to the mounting bracket, and the positioning assembly is located at the lower side of the pressurizing structure.

And the positioning component is used for positioning the optical device, and the pressurizing structure is used for pressurizing and testing the optical device on the positioning component. The positioning assembly can improve the positioning efficiency of the optical device, so that the optical device can be more efficiently placed at the pressurizing position of the pressurizing structure, and the pressurizing detection efficiency of the optical device is improved in a mode that the positioning assembly improves the positioning efficiency.

The pressurizing structure comprises a pressure test pen and a sliding component, wherein the pressure test pen is connected with the sliding component, and the sliding component drives the pressure test pen to move.

The sliding assembly is used for controlling the movement of the pressure test pen, so that the pressure test pen applies pressure to the optical device on the positioning assembly. The sliding component restrains the moving direction of the pressure test pen, and ensures that the pressure applied to the optical device is accurate.

The mounting support is provided with the guide way, the location structure is provided with the guide block, the guide block slidable sets up in the guide way, the guide way with place platform's removal orbit is parallel.

When the model of the optical device to be tested is changed, the pressing position of the optical device may be changed, and thus the position of the positioning structure is adjusted in the direction of the guide groove, thereby changing the position of the click portion. After the position of the clamping part is changed, when the positioning groove and the clamping part are matched to form a positioning function, the position of the placing platform is changed, and the relative position of the optical device and the pressurizing area is changed, so that the pressurizing position of the optical device is adjusted. Similarly, after the placement platform is replaced, the position of the positioning groove may be changed, and the optical device is positioned in the pressurizing area when the positioning groove and the clamping part are matched to form a positioning effect by adjusting the position of the positioning structure.

The utility model has the following beneficial effects:

according to the utility model, the clamping part on the positioning structure is matched with the positioning groove on the placing platform, so that the placing platform can be more quickly fixed, the optical device can be more efficiently and accurately moved to the pressurizing position, and the pressurizing test efficiency of the optical device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of one embodiment of a positioning assembly;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

FIG. 4 is a top view of FIG. 1;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is a schematic diagram of a pressure testing device;

FIG. 7 is a schematic diagram of a pressure test pen;

fig. 8 is a schematic view of the internal structure of the pressure test pen.

In the drawings, the list of components represented by the various numbers is as follows:

1. a positioning structure; 2. placing a platform; 3. a buffer structure; 4. a clamp; 5. a slide block; 6. a guide rail; 7. a limiting block; 8. an adsorption structure; 9. a clamping part; 10. a positioning groove; 11. a guide groove; 12. a guide block; 13. a pressure test pen; 14. a mounting bracket, 401, and an operating lever; 402. a fixing seat; 403. a transmission rod; 404. a thrust rod; 1301. a penholder; 1302. an adjusting bolt; 1303. a pen container; 1304. a spring; 1305. a pen point; 1306. a limit structure; 1307. a clamping surface; 1308. a strip hole; 1309. a stop ring; 1310. a fixing part; 1311. and a pen tail.

Detailed Description

The technical scheme of the utility model is clearly and completely described by a specific implementation mode of the embodiment of the utility model with the aid of the attached drawings.

Referring to fig. 1, the present utility model is a positioning assembly and a pressure testing device, wherein the positioning assembly comprises a positioning platform 2 and a positioning structure 1, the positioning structure 1 is disposed on one side of a sliding path of the positioning platform 2, the positioning structure 1 is provided with a movable clamping portion 9, the positioning platform 2 is provided with a positioning slot 10, and the positioning slot 10 is adapted to the clamping portion 9. When the placement platform 2 slides to one side of the positioning structure 1, the clamping part 9 can be clamped into the positioning groove 10, so that the position of the placement platform 2 is positioned. The placing platform 2 is provided with a feed chute for placing optical devices. After the clamping part 9 positions the placing platform 2, the optical device in the feeding chute is positioned. Therefore, when the positioning part 9 is only needed to position the placing platform 2, the feeding chute is positioned under the pressurizing structure, so that the positioning of the optical device and the pressurizing structure can be realized, and the optical device is positioned at the appointed pressurizing position of the pressurizing structure. When the optical device is pressurized and detected, the optical device is only required to be placed in the feed chute, then the placement platform 2 is pushed to move to the lower side of the pressurizing structure, and the positioning structure 1 is used for positioning the placement platform 2, so that the rapid positioning of the pressurizing structure and the optical device is realized, the positioning efficiency is improved, and the detection efficiency of the pressurizing detection is improved. After the pressurization detection of one optical device is finished, the placing platform 2 is led out of the lower side of the pressurization structure, and the optical device in the feed chute is replaced to carry out the next pressurization detection. Therefore, the combination of the platform and the positioning structure 1 is prevented, and the positioning efficiency of the optical device can be improved, so that the detection efficiency of the optical device is improved.

The positioning structure 1 comprises a mounting block, a clamping part 9 and an elastic piece, and the clamping part 9 can be automatically clamped into the positioning groove 10 under the elastic action of the elastic piece.

In one embodiment, the clamping portion 9 is a ball plunger, the mounting block is provided with a mounting hole of the ball plunger, an axis of the mounting hole of the ball plunger is perpendicular to the placement platform 2, a spring 1304 is arranged in the mounting hole of the ball plunger, and the spring 1304 enables the ball plunger to move towards the placement platform 2 by elastic force of the spring 1304. The ball head part of the ball plunger faces the placing platform 2, the mounting hole is a through hole, one end of the through hole, which is close to the placing platform 2, is provided with a step, the diameter of an inner ring of the step is smaller than that of the ball plunger, so that only part of the ball head of the ball plunger penetrates through the mounting hole, the other side of the mounting hole is provided with a jacking screw, the spring 1304 and the ball plunger are located on the same axis, the jacking screw and the ball plunger compress the spring 1304 from two sides, the spring 1304 is in a compressed state, the ball plunger is ensured to always bear the thrust of the spring 1304 along the axis direction, and the positioning of the ball plunger is ensured to be stable. When the placing platform 2 moves to one side of the positioning structure 1, the placing platform 2 can compress the ball plunger to enable the ball plunger to retract into the mounting hole, and when the positioning groove 10 moves to the position of the ball plunger, the ball plunger pops up under the action of elasticity so as to be matched with the positioning groove 10, and the positioning effect on the placing platform 2 is completed. After the pressurization detection of the optical device is completed, the placement platform 2 is moved to enable the notch of the positioning groove 10 to compress the ball plunger, so that the ball plunger retreats to the mounting hole, the placement platform 2 can be retreated from the pressurization position, and the optical device on the placement platform 2 is replaced. Similarly, the ball plunger can be replaced by a ball.

In another embodiment, the elastic member is a spring 1304 piece, the clamping portion 9 is in a hemispherical structure, a plane of the hemispherical structure is fixedly connected with one end of the spring 1304 piece in a welding or screw connection mode, and the other end of the spring 1304 piece is fixedly connected with the positioning structure 1. When the positioning platform 2 moves to one side of the positioning structure 1, the side surface of the positioning platform 2 can compress the hemispherical structure, so that the spring 1304 piece deforms, and when the positioning groove 10 moves to the hemispherical structure, the elastic force of the spring 1304 piece can enable the hemispherical structure to be clamped into the positioning groove 10, so that the positioning effect on the positioning platform 2 is completed. When the placement platform 2 is withdrawn from the pressing position, the slot opening of the placement groove also presses the hemispherical structure, so that the spring 1304 is deformed, the hemispherical structure is withdrawn from the positioning groove 10, and the placement platform 2 is withdrawn from the pressing position, so that the optical device can be replaced.

In yet another embodiment, as shown in fig. 5, a separate elastic member is not provided, and the detent portion 9 is a ball plunger structure made of an elastic material. When the positioning platform 2 moves to press the clamping part 9, the clamping part 9 is compressed and deformed, and when the positioning groove 10 moves to the position of the clamping part 9, the clamping part 9 can restore the shape, and the clamping part 9 with the restored shape can be clamped into the positioning groove 10, so that the positioning platform 2 is positioned. The clamping part 9 adopts the structure of a ball plunger, the ball part is positioned at one end contacted with the placing platform 2, and the spherical surface of the ball part can generate axial force when being extruded by the placing platform 2, so that the ball plunger is compressed towards the axial direction, the placing platform 2 can smoothly compress the ball plunger, and in the same way, the spherical surface can also be replaced by a conical surface or an inclined surface.

The shape of the positioning groove 10 can be matched with the shape of the clamping part 9, and when the clamping part 9 is positioned in the positioning groove 10, the placement platform 2 cannot slide continuously along the sliding direction under the condition of not receiving external force. When the contact surface between the clamping part 9 and the positioning groove 10 is spherical, the positioning groove 10 is hemispherical, rectangular or trapezoidal, and can be a groove perpendicular to the moving direction of the placing platform 2, so that the clamping part 9 can enter the positioning groove 10, and meanwhile, the positioning groove 10 and the clamping part 9 cannot translate relatively.

The device further comprises a guide rail 6 and a slide block 5, wherein the slide block 5 is slidably connected with the guide rail 6, and the placement platform 2 is connected with the slide block 5 and moves along the direction of the guide rail 6 along with the slide block 5.

And a linear mechanism for driving the slider 5 to move. The linear mechanism may be an automatic structure such as an air cylinder or a manual structure such as a clamp 4.

As shown in fig. 3, in one embodiment, the linear mechanism is a clamp 4, the clamp 4 includes a fixing base 402, an operation rod 401, a transmission rod 403, and a thrust rod 404, the fixing base 402 is provided with a guide hole, the thrust rod 404 is slidably connected with the guide hole, the operation rod 401 is provided with two hinge holes, the operation rod 401 is respectively hinged with the fixing base 402 and the transmission rod 403 through the two hinge holes, the transmission rod 403 is also provided with two hinge holes, and the transmission rod 403 is respectively hinged with the operation rod 401 and the thrust rod 404 through the two hinge holes. When the operation rod 401 is shifted, the operation rod 401 swings around the hinge point with the fixed seat 402, so as to push the transmission rod 403 to move, and the movement of the transmission rod 403 causes the thrust rod 404 to slide along the guide hole, so that the swinging movement of the operation rod 401 is converted into the linear movement of the thrust rod 404. The thrust rod 404 is fixedly connected with the sliding block 5, and the axis of the thrust rod 404 is parallel to the sliding direction of the sliding block 5. Thus, pulling the lever 401 can slide the slider 5 along the guide rail 6, so that the placement platform 2 can reciprocate along the guide rail 6.

The guide rail 6, the sliding block 5 and the linear mechanism form a sliding assembly, and the sliding assembly controls the movement of the placement platform 2.

As shown in fig. 4, the two ends of the guide rail 6 are both provided with a limiting portion, when the force applied by the linear mechanism is too large, the positioning groove 10 may directly pass through the clamping portion 9, so that the placement platform 2 and the slide block 5 continue to slide along the guide rail 6, and the anti-disengagement structure is used for preventing the slide block 5 from disengaging from the guide rail 6.

As shown in fig. 2, the limiting part at one end is a limiting block 7, the limiting block 7 is provided with an adsorption structure 8, and the adsorption structure 8 is used for adsorbing the placement platform 2 or the adsorption sliding block 5, so that the position of the placement platform 2 is fixed, and the placement platform 2 is prevented from moving when the optical device is replaced.

The suction structure 8 may be a magnet or a suction cup.

The limit part at the other end is a square structure or a buffer structure 3 arranged at the end part of the guide rail 6. The damping structure 3 may be a hydraulic damper or a spring 1304.

Preferably, an oil buffer is adopted to play a role in buffering the placement platform 2, so that the situation that the placement platform 2 collides and scram to cause the optical device to separate is avoided.

As shown in FIG. 6, a pressure testing device comprises a mounting bracket 14, a positioning component and a pressurizing structure, wherein the positioning component and the pressurizing structure are connected with the mounting bracket 14, the positioning component is positioned at the lower side of the pressurizing structure, and the pressurizing structure can be used for performing pressure testing on an optical device on the positioning component by downward pressurization.

The mounting bracket 14 may be a frame structure of a profile structure or a bracket structure formed by a plurality of flat plates.

As shown in fig. 5, the mounting bracket 14 is provided with a guide groove 11, the positioning structure 1 is provided with a guide block 12, the guide block 12 is positioned in the guide groove 11, and the guide groove 11 is used for restricting the moving path of the guide block 12. The guide groove 11 is parallel to the moving track of the placement platform 2. When the pressurizing test is needed to be carried out on different optical devices, if the volumes of the optical devices are different, the placement platform 2 needs to be replaced, so that the shape of the feeding chute on the placement platform 2 is matched with the optical devices. After the placement platform 2 is replaced, the position of the optical device to be pressurized is different, and the position of the positioning groove 10 is also changed. Therefore, through the cooperation of the guide groove 11 and the guide block 12, the positioning structure 1 can be adjusted along the moving direction of the placement platform 2, so that the position of the positioning structure 1 is changed, and when the clamping part 9 of the positioning structure 1 is clamped into the positioning groove 10, the optical device on the placement platform 2 is positioned in the pressurizing area of the pressurizing structure.

The guide groove 11 is a strip hole, and after the position of the positioning structure 1 is adjusted, a bolt can be used to pass through the strip hole for fixing, so that the position of the clamping part 9 is fixed.

Similarly, the guide groove 11 is a groove structure, the mounting bracket 14 is separately provided with a strip hole for fixing the positioning structure 1, and after the position adjustment of the positioning structure 1 is completed, the position of the positioning structure 1 can be fixed through a bolt.

The pressurizing structure comprises a sliding component and a pressure test pen 13, wherein the sliding component is used for controlling the movement of the pressure test pen 13, so that the pressure test pen 13 is used for calendering the device, and the pressure test is carried out on the device.

The slide 5 of the slide assembly is connected to the pressure test pen 13 such that the movement of the linear mechanism is transmitted to the pressure test pen 13.

As shown in fig. 7 and 8, the pressure test pen 13 includes a pen holder 1303, a pen holder 1301, a spring 1304 and an adjusting bolt 1302, the pen holder 1301 is disposed in the pen holder 1303, the spring 1304 is sleeved in the pen holder 1301, one end of the spring 1304 is connected with the pen holder 1301, the other end is connected with the adjusting bolt 1302, and the adjusting bolt 1302 is in threaded connection with the pen holder 1303.

By screwing the adjusting bolt 1302, the compression degree of the spring 1304 can be changed, so that the pressure born by the pen holder 1301 is changed, the pressure range in which the pen holder 1301 starts to move can be overlapped with the detected preset pressure of the optical device, and the pressure can be accurately controlled in a stroke control mode in the process of fine adjustment of the pressure. In addition, when different optical devices are detected, the compression amount of the spring 1304 can be changed by screwing the adjusting bolt 1302, so that the acting force of the spring 1304 on the pen holder 1301 is changed, and the moving pressure range of the pen holder 1301 is overlapped with the preset pressure of the optical device to be detected. When the preset pressure difference between the optical device to be detected and the optical device to be detected is too large, the pressure range of the movement of the pen holder 1301 can be changed by changing the springs 1304 with different elasticity, so that the pressure test pen 13 can be suitable for pressure detection of optical devices with different types, and the universality of pressure detection of the optical devices is provided.

The pen further comprises a pen point 1305, wherein one end of the pen point 1305 is connected with the pen holder 1301, and the other end of the pen point 1305 penetrates through the pen holder 1303 and is positioned outside the pen holder 1303.

The pen point 1305 acts on the optical device, so that the material of the pen point 1305 can be different from the material of the pen holder 1301, the material of the pen holder 1301 can be made of more economical and cheap materials, and the manufacturing cost of the pressure test pen 13 is reduced.

The pen holder 1301 is provided with a limiting structure 1306, and the end of the spring 1304 abuts against the limiting structure 1306.

The connection between the pen holder 1301 and the spring 1304 is realized through the limiting structure 1306, so that the installation operation can be simplified, the spring 1304 is sleeved on the pen holder 1301, and the replacement of the spring 1304 is facilitated.

The pen further comprises a stop ring 1309, the stop ring 1309 is sleeved on the pen holder 1301, the stop ring 1309 is located between the spring 1304 and the adjusting bolt 1302, and the spring 1304 abuts against the end face of the stop ring 1309.

A stop ring 1309 is provided to indirectly connect the spring 1304 with the adjustment bolt 1302. The torsion of the spring 1304 caused by the rotation of the adjusting bolt 1302 can be avoided, the damage and dislocation of the spring 1304 are avoided, and the stability of the performance of the pressure test pen 13 is improved.

The outer side wall of the pen container 1303 is provided with at least one clamping surface 1307.

The grip surface 1307 is provided to prevent rotation of the brush pot 1303 when the adjustment bolt 1302 is screwed. The pressure test pen 13 can be held by hand without rotating.

And a fixing part 1310, wherein the fixing part 1310 is connected to the outer side wall of the pen container 1303.

The provision of the fixing portion 1310 can facilitate connection of the pressure test pen 13 with the pressurizing structure.

The pen further comprises a pen tail 1311, wherein the pen tail 1311 is of a cylindrical structure, and the pen tail 1311 is in threaded connection with the pen container 1303.

The pen tail 1311 is arranged, so that the pressure test pen 13 is more attractive, the external environment can be prevented from directly acting on the pen holder 1301 and the adjusting bolt 1302, the position of the adjusting bolt 1302 is ensured not to be changed, and the stability of the pressure test pen 13 is improved.

Claims (10)

1. A positioning assembly, characterized in that: including location structure (1), place platform (2) and slip subassembly, place platform (2) with slip subassembly is connected, location structure (1) set up in slip path one side of place platform (2), location structure (1) are including mobilizable screens portion (9), place platform (2) are provided with feed chute and constant head tank (10), screens portion (9) with the location of place platform (2) is realized in constant head tank (10) cooperation, the feed chute is used for placing the optical device.

2. A positioning assembly as defined in claim 1, wherein: the positioning structure (1) further comprises an elastic piece and a mounting block, the elastic piece is connected with the mounting block, and the clamping part (9) is connected with the elastic piece.

3. A positioning assembly as defined in claim 1, wherein: the sliding assembly comprises a guide rail (6), a sliding block (5) and a linear mechanism, wherein the sliding block (5) is slidably connected with the guide rail (6), the placing platform (2) is connected with the sliding block (5), and the linear mechanism is used for driving the sliding block (5) to move.

4. A positioning assembly as set forth in claim 3 wherein: the linear mechanism is an air cylinder, a screw rod, an oil cylinder or a clamp (4).

5. A positioning assembly as set forth in claim 3 wherein: the end part of the guide rail (6) is provided with a limiting part, and the limiting part is used for preventing the sliding block (5) from being separated from the guide rail (6).

6. A positioning assembly as defined in claim 5, wherein: the limiting part is a limiting block (7), and the limiting block (7) is provided with an adsorption structure (8).

7. A positioning assembly as defined in claim 5, wherein: the limiting part is a buffer structure (3).

8. A pressure testing device, characterized in that: a positioning assembly comprising the device of any of claims 1-7, further comprising a mounting bracket (14) and a pressing structure, both of which are connected to the mounting bracket (14), the positioning assembly being located on the underside of the pressing structure.

9. A pressure testing device according to claim 8, wherein: the pressurizing structure comprises a pressure test pen (13) and a sliding component, wherein the pressure test pen (13) is connected with the sliding component, and the sliding component drives the pressure test pen (13) to move.

10. A pressure testing device according to claim 9, wherein: the mounting support (14) is provided with a guide groove (11), the positioning structure (1) is provided with a guide block (12), the guide block (12) is slidably arranged in the guide groove (11), and the guide groove (11) is parallel to the moving track of the placement platform (2).