Air tightness testing device for forklift bearing seat

Abstract

The utility model relates to an air tightness testing device for a forklift bearing seat. The air tightness testing device comprises a bottom plate, a lower module fixed at the top of the bottom plate, and a mold closing mechanism arranged above the lower module, the mold closing mechanism comprises a transversely-arranged top plate, a lifting plate transversely arranged below the top plate, four guide columns vertically arranged in the lifting plate in a penetrating mode and symmetrically distributed in pairs, at least one first lifting air cylinder fixed to the top of the top plate, and an upper mold assembly arranged at the bottom of the lifting plate. The upper die assembly comprises an upper die block fixed to the lifting plate and matched with the lower die block, and a plurality of pressing seats vertically embedded in the bottom of the upper die block and sequentially distributed at equal intervals from left to right. According to the utility model, the operation steps are greatly simplified, and the detection efficiency is effectively improved; in addition, the leakage position can be quickly and accurately found, so that the time-saving and labor-saving effects are achieved.

Description

Technical Field

[0001] The utility model relates to an air tightness testing device for a forklift bearing seat. Background Art

[0002] A forklift refers to various wheeled handling vehicles for loading, unloading, stacking and short-distance transportation operations of palletized goods in pieces; the steering wheel steering shaft of a forklift is a very important component in its steering system, and its main function is to transmit the steering torque applied by the driver to the steering wheel to the steering gear. The steering wheel steering shaft of the forklift is installed in a supporting bearing seat. The processing of the bearing seat requires multiple processes, and air tightness testing must also be carried out before leaving the factory.

[0003] When the existing forklift bearing seats are subjected to air tightness testing, most of them need to rely on manual operation to complete the positioning and fixing of the bearing seats and the sealing and plugging of the air inlet and outlet joints. Therefore, the operation steps are relatively cumbersome, and only one bearing seat can be tested at a time, so the detection efficiency is low; in addition, when finding the leakage position of the unqualified bearing seats selected through testing, it is time-consuming and laborious, and there is room for further improvement. Summary of the Utility Model

[0004] Aiming at the current situation of the above-mentioned existing technology, the technical problem to be solved by the utility model is to provide an air tightness testing device for a forklift bearing seat that greatly simplifies the operation steps, effectively improves the detection efficiency, and can quickly and accurately find the leakage position to achieve the effect of saving time and effort.

[0005] The technical solution adopted by the utility model to solve the above technical problems is as follows: an air tightness testing device for a forklift bearing seat, characterized in that it includes a bottom plate, a lower module fixed on the top of the bottom plate, and a mold closing mechanism arranged above the lower module;

[0006] The mold closing mechanism includes a horizontally arranged top plate, a lifting plate horizontally arranged below the top plate, four guiding columns vertically inserted through the lifting plate and symmetrically distributed in pairs, at least one first lifting cylinder fixed on the top of the top plate, and an upper mold assembly arranged at the bottom of the lifting plate. The telescopic end of each first lifting cylinder vertically passes through the top plate downward and is detachably fixed on the top of the lifting plate;

[0007] The upper mold assembly includes an upper module fixed on the lifting plate and cooperating with the lower module, and a plurality of pressing seats vertically embedded at the bottom of the upper module and equally spaced from left to right in sequence. A concentric pressing block is formed downward at the bottom of each pressing seat, and a first air outlet hole is opened between the center of the end of the pressing block and the outer wall of the top of the pressing seat;

[0008] The top of the lower module is provided with a plurality of air extraction cavities distributed in sequence from left to right. The number of the air extraction cavities is equal to the number of the pressing seats. The center distance between any two adjacent air extraction cavities is equal to the center distance between any two adjacent pressing seats.

[0009] On the bottom surface of each air extraction cavity, a triangular convex block is formed upward. A sunken groove is formed at the end of each triangular convex block.

[0010] A first through hole distributed horizontally is formed between the outer walls on the left and right sides of the lower module. A plurality of second through holes distributed in sequence from left to right are formed between the outer wall on the front or rear side of the lower module and the inner wall of the first through hole. The number of the second through holes is equal to the number of the air extraction cavities. Each second through hole is arranged below a corresponding air extraction cavity. A third through hole is formed between the bottom surface of each sunken groove and the inner wall of a second through hole located below it.

[0011] An air extraction hole is formed between the bottom outer wall of the lower module and the inner wall of the first through hole.

[0012] Preferably, a plurality of air ventilation cavities distributed in sequence from left to right are formed on the top of the upper module. An opening groove is formed between the edges of the openings of any two adjacent air ventilation cavities. A cavity hole is formed between the center of the bottom surface of each air ventilation cavity and the bottom outer wall of the upper module.

[0013] Preferably, the number of the air ventilation cavities is equal to the number of the pressing seats. Each pressing seat is movably embedded in a corresponding air ventilation cavity. Each pressing block on each pressing seat is movably embedded in a corresponding cavity hole. The end of each pressing block extends below the bottom of the upper module. The height of the pressing seat is less than the depth of the air ventilation cavity.

[0014] Preferably, two horizontally distributed air intake cavities are formed on the left or right outer wall of the upper module. The inner walls of the two air intake cavities are respectively communicated with the front and rear inner walls of the leftmost or rightmost air ventilation cavity. An air release hole is also formed between the left or right outer wall of the upper module and the inner wall of the nearest air ventilation cavity.

[0015] Preferably, a horizontally arranged and detachable cover plate is further fixed on the top of the upper module. The bottom outer wall of the cover plate is hermetically attached to the opening of each air ventilation cavity. A vertically distributed spring is further arranged between the cover plate and each pressing seat. An annular notch groove is formed at the edge of the top opening of the first air outlet hole. The lower end of each spring is embedded in an annular notch groove on a corresponding pressing seat and is tightly pressed against the inner wall of the bottom surface of the annular notch groove. The upper end of each spring is tightly pressed against the bottom outer wall of the cover plate to always apply a vertically downward thrust to the pressing seat.

[0016] Preferably, a vacuum pumping assembly is further provided below the bottom plate. The vacuum pumping assembly includes a support plate horizontally arranged below the bottom plate, a plurality of upright columns vertically fixed between the bottom plate and the support plate, a second lifting cylinder fixed on the support plate, and an air extraction column vertically inserted through the bottom plate. The telescopic end of the second lifting cylinder is vertically upward and fixed to the lower end of the air extraction column.

[0017] Preferably, a vertically distributed air extraction sink is opened at the center of the upper end of the air extraction column. A communication hole is opened between the outer wall of one side of the upper end of the air extraction column and the inner wall of the air extraction sink. The opening of the air extraction sink is matched with the lower opening of the air extraction hole.

[0018] Preferably, a horizontally movable carrier block is further connected to the top of the bottom plate. The bottom of the lower module is fixed on the carrier block. A material transfer cylinder is further provided on one side of the carrier block. The telescopic end of the material transfer cylinder is horizontally arranged and parallel to the moving direction of the carrier block and fixed on the carrier block.

[0019] Preferably, a plurality of positioning sinks are further opened on the top of the lower module, which are distributed in sequence from left to right. The number of positioning sinks is equal to the number of air extraction sinks. Each positioning sink is arranged in front of a corresponding air extraction sink; a groove is opened between the edge of the opening of each air extraction sink and the edge of the opening of an air extraction sink located behind it.

[0020] Preferably, a sealing gasket is embedded at the bottom of each air extraction sink. A triangular hole matched with the triangular convex block is opened in the sealing gasket. The sealing gasket is sleeved outside the triangular convex block through the triangular hole. A convex ring is formed upward at the top of each sealing gasket.

[0021] Compared with the prior art, the advantages of the present utility model are as follows: The present utility model not only realizes the automatic positioning and fixing of the bearing seat, but also can realize the automatic sealing and plugging of the air inlet and outlet joints, thereby greatly simplifying the operation steps. Moreover, it can simultaneously test multiple bearing seats at one time, thereby effectively improving the detection efficiency; in addition, it can quickly and accurately find the leakage position under the combined action of the color-developing gas and the color-developing powder to achieve the effect of saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a left front side structure diagram of the present utility model;

[0023] Figure 2 It is a right rear side exploded structure diagram of the upper die assembly of the present utility model;

[0024] Figure 3 It is a right rear side exploded structure diagram of the lower module, the sealing gasket and the first sealing ring of the present utility model;

[0025] Figure 4 The right front elevation view of the lower module of the present utility model;

[0026] Figure 5 The right front exploded view of the vacuum pumping assembly of the present utility model. Specific embodiments

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those of ordinary skill in the field to which the present utility model pertains. The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute positions of the objects being described change, the relative positional relationships may also change accordingly.

[0028] In order to keep the following description of the embodiments of the present utility model clear and concise, the detailed descriptions of known functions and known components are omitted in the present utility model.

[0029] As Figures 1 to 5 shown, an airtightness testing device for a forklift bearing seat includes a bottom plate 1, a lower module 2 fixed to the top of the bottom plate 1, and a mold clamping mechanism 3 disposed above the lower module 2;

[0030] The mold clamping mechanism 3 includes a horizontally arranged top plate 31, a lifting plate 32 horizontally disposed below the top plate 31, four guiding columns 33 vertically inserted through the lifting plate 32 and symmetrically distributed in pairs, at least one first lifting cylinder 34 fixed to the top of the top plate 31, and an upper mold assembly disposed at the bottom of the lifting plate 32. The telescopic end of each first lifting cylinder 34 vertically passes through the top plate 31 downward and is detachably fixed to the top of the lifting plate 32;

[0031] The upper mold assembly includes an upper module 35 fixed to the lifting plate 32 and cooperating with the lower module 2, and a plurality of pressing seats 36 vertically embedded in the bottom of the upper module 35 and equally spaced from left to right in sequence. A concentric pressing block 361 is formed downward at the bottom of each pressing seat 36, and a first air outlet hole 362 is formed between the center of the end of the pressing block 361 and the outer wall of the top of the pressing seat 36;

[0032] The top of the lower module 2 is provided with a plurality of air extraction cavities 201 which are distributed in sequence from left to right. The number of the air extraction cavities 201 is equal to the number of the pressure seats 36. The center distance between any two adjacent air extraction cavities 201 is equal to the center distance between any two adjacent pressure seats 36.

[0033] On the bottom surface of each air extraction cavity 201, a triangular convex block 202 is formed upward. A sinking groove 203 is provided at the end of each triangular convex block 202.

[0034] A horizontally distributed first through hole 204 is provided between the outer walls on the left and right sides of the lower module 2. A plurality of second through holes 206 which are distributed in sequence from left to right are provided between the outer wall on the front or rear side of the lower module 2 and the inner wall of the first through hole 204. The number of the second through holes 206 is equal to the number of the air extraction cavities 201. Each second through hole 206 is arranged below a corresponding air extraction cavity 201. A third through hole 205 is provided between the bottom surface of each sinking groove 203 and the inner wall of a second through hole 206 located below it.

[0035] An air extraction hole 207 is provided between the outer wall at the bottom of the lower module 2 and the inner wall of the first through hole 204.

[0036] The top of the upper module 35 is provided with a plurality of air ventilation cavities 351 which are distributed in sequence from left to right. An opening groove 352 is provided between the edges of the openings of any two adjacent air ventilation cavities 351. A cavity hole 353 is provided between the center of the bottom surface of each air ventilation cavity 351 and the outer wall at the bottom of the upper module 35.

[0037] The number of the air ventilation cavities 351 is equal to the number of the pressure seats 36. Each pressure seat 36 is movably embedded in a corresponding air ventilation cavity 351. Each pressing block 361 on each pressure seat 36 is movably embedded in a corresponding cavity hole 353. The end of each pressing block 361 extends below the bottom of the upper module 35. The height of the pressure seat 36 is less than the depth of the air ventilation cavity 351.

[0038] Two horizontally distributed air intake cavities 354 are provided on the left or right outer wall of the upper module 35. The inner walls of the two air intake cavities 354 are respectively communicated with the front and rear inner walls of the leftmost or rightmost air ventilation cavity 351. An air release hole 355 is also provided between the left or right outer wall of the upper module 35 and the inner wall of the nearest air ventilation cavity 351.

[0039] A horizontally-disposed and detachable cover plate 38 is also fixed to the top of the upper module 35. The bottom outer wall of the cover plate 38 is hermetically attached to the opening of each ventilation sink hole 351. A vertically-distributed spring 37 is provided between the cover plate 38 and each pressure seat 36. An annular notch groove 363 is formed at the edge of the top opening of each first air outlet hole 362. The lower end of each spring 37 is embedded in the annular notch groove 363 on the corresponding pressure seat 36 and is tightly abutted against the inner wall of the bottom surface of the annular notch groove 363. The upper end of each spring 37 is tightly abutted against the bottom outer wall of the cover plate 38 to always apply a vertically downward thrust to the pressure seat 36.

[0040] A vacuum pumping assembly 4 is also provided below the bottom plate 1. The vacuum pumping assembly 4 includes a support plate 41 horizontally disposed below the bottom plate 1, a plurality of upright columns 42 vertically fixed between the bottom plate 1 and the support plate 41, a second lifting cylinder 43 fixed to the support plate 41, and an air extraction column 44 vertically inserted through the bottom plate 1. The telescopic end of the second lifting cylinder 43 is vertically upward and fixed to the lower end of the air extraction column 44.

[0041] A vertically-distributed air extraction sink hole 441 is opened at the center of the upper end of the air extraction column 44. A communication hole 442 is opened between the outer wall of one side of the upper end of the air extraction column 44 and the inner wall of the air extraction sink hole 441. The opening of the air extraction sink hole 441 cooperates with the lower opening of the air extraction hole 207.

[0042] A horizontally movable carrier block 8 is also connected to the top of the bottom plate 1. The bottom of the lower module 2 is fixed to the carrier block 8. A material transfer cylinder 7 is also provided on one side of the carrier block 8. The telescopic end of the material transfer cylinder 7 is horizontally disposed and parallel to the moving direction of the carrier block 8 and is fixed to the carrier block 8.

[0043] A plurality of positioning sink cavities 208 are also opened at the top of the lower module 2 and are distributed in sequence from left to right. The number of the positioning sink cavities 208 is equal to the number of the air extraction sink cavities 201. Each positioning sink cavity 208 is disposed in front of a corresponding air extraction sink cavity 201.

[0044] A groove 209 is opened between the edge of the opening of each air extraction sink cavity 201 and the edge of the opening of an air extraction sink cavity 201 located behind it.

[0045] A sealing gasket 5 is also embedded at the bottom of each air extraction sink cavity 201. A triangular hole 51 that cooperates with the triangular convex block 202 is opened in the sealing gasket 5. The sealing gasket 5 is sleeved outside the triangular convex block 202 through the triangular hole 51. A convex ring 52 is formed upward at the top of each sealing gasket 5.

[0046] A sealing sink groove 2010 surrounding each air extraction sink cavity 201 is opened at the top of the lower module 2. A first sealing ring 6 is also embedded in the sealing sink groove 2010. The top of the first sealing ring 6 is higher than the top of the lower module 2.

[0047] The upper end of the air extraction column 44 is also embedded with a second sealing ring 46 concentrically surrounding the periphery of the air extraction sink hole 441, and the top of the second sealing ring 46 is higher than the upper end of the air extraction column 44.

[0048] Working principle:

[0049] The telescopic end of the driving material transfer cylinder 7 contracts inward to drive the lower module 2 to move horizontally to one side of the top of the bottom plate 1 by means of the carrier block 8. Then, a bearing seat is placed in each air extraction cavity 201 on the lower module 2, and the end of the triangular convex block 202 extends into the structural hole at the bottom of the bearing seat. At the same time, other parts of the bearing seat are embedded in the positioning sink cavity 208 and the groove 209 to play a limiting role, and the outer opening of the third through hole 205 communicates with the opening of the oil injection hole at the bottom of the bearing seat.

[0050] The telescopic end of the driving material transfer cylinder 7 extends outward to drive the lower module 2 to move below the upper module 35 in the same way. At this time, the air extraction hole 207 is directly above the air extraction sink hole 441; the telescopic end of the second lifting cylinder 43 in the air extraction assembly 4 is extended outward to drive the air extraction column 44 to move upward, so that the upper end of the air extraction column 44 passes through the carrier block 8 and abuts against the bottom of the lower module 2, and then is pressed against the outer wall of the bottom of the lower module 2 by means of the second sealing ring 46 to achieve sealing.

[0051] The telescopic end of each first lifting cylinder 34 in the mold closing mechanism 3 is extended outward to drive the lifting plate 32 to move downward along the four guide posts 33, and then drive the upper mold assembly to move downward to approach the lower module 2 until the outer wall of the bottom of the upper module 35 is pressed against the top of the first sealing ring 6 to achieve sealing between the upper module 35 and the lower module 2; at this time, the end of the pressing block 361 on each pressing seat 36 is elastically pressed against the outer wall of the top of a bearing seat below it, and each first air outlet 362 communicates with the opening of the oil injection hole at the top of the bearing seat.

[0052] The air inlet of the air extraction pump is communicated with the outer opening of the communication hole 442 by means of the air extraction joint 45, and both ends of the first through hole 204 and the outer openings of each second through hole 206 are closed. After starting the air extraction pump, the air inside the bearing seat will enter the first through hole 204 through the third through hole 205 and the second through hole 206, then enter the air extraction sink hole 441 through the air extraction hole 207, and finally be sucked into the air inlet of the air extraction pump through the communication hole 442 to achieve vacuum extraction.

[0053] The color-developing gas is simultaneously introduced into the two air inlet counterbores 354 through two air inlet connectors 39, and then enters one of the leftmost or rightmost air vent counterbores 351. Thus, it enters each of the remaining air vent counterbores 351 through each opening slot 352, and then enters the first air outlet holes 362 in each pressure seat 36 and enters the oil injection holes of each bearing seat to maintain pressure. Since the outer walls of each bearing seat are coated with color-developing powder, if the color-developing powder comes into contact with the color-developing gas, the color-developing powder will react and change color. Therefore, during the test, it is only necessary to observe whether the outer walls of the bearing seats change color. If there is no color change, it indicates that the sealing performance of the bearing seat meets the standard; otherwise, it indicates that the sealing performance of the bearing seat does not meet the standard, and the air leakage position can be quickly determined according to the color-changing point.

[0054] If the pressure in the air vent counterbore 351 is too high, it can be discharged outward through the air release hole 355. After the test is completed, first evacuate the color-developing gas through the air release hole 355. Then, drive the telescopic ends of each first lifting cylinder 34 in the mold closing mechanism 3 to contract inward, and accordingly drive the upper module 35 to move upward to leave the lower module 2. Then, drive the telescopic end of the second lifting cylinder 43 in the vacuum pumping assembly 4 to contract inward, and accordingly drive the air extraction column 44 to move downward until the upper end of the air extraction column 44 leaves the bottom of the lower module 2. Finally, drive the telescopic end of the material transfer cylinder 7 to contract inward, and use the carrier block 8 to drive the lower module 2 to move horizontally to one side of the top of the bottom plate 1, and then take away each bearing seat upward.

[0055] The utility model not only realizes the automatic positioning and fixation of the bearing seat, but also can realize the automatic sealing and plugging of the air inlet and outlet connectors, thereby greatly simplifying the operation steps, and can simultaneously test multiple bearing seats at one time, thus effectively improving the detection efficiency. In addition, under the combined action of the color-developing gas and the color-developing powder, the leakage position can be quickly and accurately found to achieve the effect of saving time and effort.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An airtightness testing device for a forklift bearing seat, characterized in that, It includes a bottom plate, a lower module fixed on the top of the bottom plate, and a mold clamping mechanism arranged above the lower module; The mold clamping mechanism includes a horizontally arranged top plate, a lifting plate horizontally arranged below the top plate, four guide columns vertically inserted through the lifting plate and symmetrically distributed in pairs, at least one first lifting cylinder fixed on the top of the top plate, and an upper mold assembly arranged at the bottom of the lifting plate. The telescopic end of each first lifting cylinder vertically penetrates through the top plate and is detachably fixed on the top of the lifting plate; The upper mold assembly includes an upper module fixed on the lifting plate and cooperating with the lower module, and a plurality of pressure seats vertically embedded at the bottom of the upper module and equally spaced from left to right in sequence. A concentrically arranged pressing block is formed downward at the bottom of each pressure seat. A first air outlet hole is opened between the center of the end of the pressing block and the outer wall of the top of the pressure seat; A plurality of air extraction sink cavities are opened on the top of the lower module and distributed in sequence from left to right. The number of the air extraction sink cavities is equal to the number of the pressure seats. The center distance between any two adjacent air extraction sink cavities is equal to the center distance between any two adjacent pressure seats; A triangular convex block is formed upward on the bottom surface of each air extraction sink cavity, and a sink groove is opened at the end of each triangular convex block; A horizontally distributed first through hole is opened between the left and right outer walls of the lower module. A plurality of second through holes are opened between the front or rear outer wall of the lower module and the inner wall of the first through hole and distributed in sequence from left to right. The number of the second through holes is equal to the number of the air extraction sink cavities. Each second through hole is arranged below a corresponding air extraction sink cavity. A third through hole is opened between the bottom surface of each sink groove and the inner wall of a second through hole located below it; An air extraction hole is opened between the bottom outer wall of the lower module and the inner wall of the first through hole.

2. The airtightness testing device for a forklift bearing seat according to claim 1, wherein, A plurality of air vent sink holes are opened on the top of the upper module and distributed in sequence from left to right. An opening groove is opened between the edges of the openings of any two adjacent air vent sink holes. A cavity hole is opened between the center of the bottom surface of each air vent sink hole and the bottom outer wall of the upper module.

3. The airtightness test device for a forklift bearing seat according to claim 2, characterized in that, The number of the air vent sink holes is equal to the number of the pressure seats. Each pressure seat is movably embedded in a corresponding air vent sink hole. The pressing block on each pressure seat is movably embedded in a corresponding cavity hole. The end of each pressing block extends below the bottom of the upper module. The height of the pressure seat is less than the depth of the air vent sink hole.

4. The airtightness testing device for a forklift bearing seat according to claim 3, characterized in that, Two horizontally distributed air inlet sink holes are opened on the left or right outer wall of the upper module. The inner walls of the two air inlet sink holes are respectively communicated with the front and rear inner walls of the leftmost or rightmost air vent sink hole; An air release hole is also opened between the left or right outer wall of the upper module and the inner wall of the nearest air vent sink hole.

5. An airtightness testing device for a forklift bearing seat according to claim 1, characterized in that, A horizontally and detachably mounted cover plate is also fixed to the top of the upper module. The bottom outer wall of the cover plate is hermetically attached to the opening of each ventilation sink hole. A vertically distributed spring is provided between the cover plate and each pressing seat. An annular notch groove is formed at the edge of the top opening of each first air outlet hole. The lower end of each spring is embedded in the annular notch groove on the corresponding pressing seat and abuts against the inner wall of the bottom surface of the annular notch groove. The upper end of each spring abuts against the bottom outer wall of the cover plate to always apply a vertically downward thrust to the pressing seat.

6. The airtightness testing device for a forklift bearing seat according to claim 1, characterized in that, A vacuum pumping assembly is further provided below the bottom plate. The vacuum pumping assembly includes a support plate horizontally disposed below the bottom plate, a plurality of columns vertically fixed between the bottom plate and the support plate, a second lifting cylinder fixed to the support plate, and an air extraction column vertically inserted through the bottom plate. The telescopic end of the second lifting cylinder is vertically upward and fixed to the lower end of the air extraction column.

7. An airtightness testing device for a forklift bearing seat according to claim 6, characterized in that, A vertically distributed air extraction sink hole is formed at the center of the upper end of the air extraction column. A communication hole is formed between the outer wall of one side of the upper end of the air extraction column and the inner wall of the air extraction sink hole. The opening of the air extraction sink hole cooperates with the lower opening of the air extraction hole.

8. The airtightness testing device for a forklift bearing seat according to claim 1, wherein, A horizontally movable carrier block is further connected to the top of the bottom plate. The bottom of the lower module is fixed to the carrier block. A material transfer cylinder is further provided on one side of the carrier block. The telescopic end of the material transfer cylinder is horizontally disposed and parallel to the moving direction of the carrier block and is fixed to the carrier block.

9. The airtightness testing device for a forklift bearing seat according to claim 1, characterized in that, A plurality of positioning sink cavities are further formed at the top of the lower module, which are sequentially distributed from left to right. The number of positioning sink cavities is equal to the number of air extraction sink cavities. Each positioning sink cavity is disposed in front of a corresponding air extraction sink cavity. A groove is formed between the edge of the opening of each air extraction sink cavity and the edge of the opening of an air extraction sink cavity located behind it.

10. The airtightness testing device for a forklift bearing seat according to claim 9, characterized in that, A sealing gasket is further embedded at the bottom of each air extraction sink cavity. A triangular hole that cooperates with the triangular convex block is formed in the sealing gasket. The sealing gasket is sleeved outside the triangular convex block through the triangular hole. A convex ring is formed upward at the top of each sealing gasket.

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