Horizontal type numerical control machine tool tray exchange structure

Abstract

The utility model relates to the technical field of numerical control machine tools, discloses a tray exchange structure of a horizontal numerical control machine tool, and solves the problem that trays cannot be accurately and stably aligned during exchange. The electric push rod B drives the lifting disc and the suction cup to move upwards to support the bottom of the tray until the tray completely moves to the position above the suction cup, the suction cup is opened to fix the tray, then the electric push rod B drives the lifting disc to contract and move downwards, one end of the movable plate A is driven to move downwards, and the telescopic plate rotates towards the suction cup under the rotating action of the sleeve; and the connecting vertical plate and the clamping plate are driven to clamp towards the middle, the suction cup is closed after one side of the clamping plate makes contact with the tray, the position of the tray is corrected through the clamping plate, and finally the purpose of guaranteeing the accuracy and stability of tray exchange and installation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to a pallet changing structure for a horizontal numerical control machine tool. Background Technique

[0002] The pallet changing structure of a horizontal numerical control machine tool is usually designed to have the function of high-efficiency automation. Its basic principle is to realize the automatic replacement of the workpiece pallet on the working table of the numerical control machine tool through a manipulator or an automatic pallet changing system. This structure usually includes a fixed base, a slide rail guide, a pallet changing mechanism and a control system. During operation, when the machining of the workpiece on one pallet is completed, the machine tool can automatically retract it to the base, and then automatically move another pallet loaded with the workpiece to be machined into the working position through the pallet changing mechanism. However, when the existing pallet changing structure is used, it is easy to have deviations when aligning the pallets, resulting in inaccurate replacement of the pallet positions. Moreover, the manipulator structure is relatively complex and the cost is too high.

[0003] In view of the above problems, a pallet changing structure for a horizontal numerical control machine tool is proposed to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pallet changing structure for a horizontal numerical control machine tool. By using this device for work, the problem that the existing pallet changing cannot be accurately and stably aligned is solved.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A pallet changing structure for a horizontal numerical control machine tool, including an exchange table, a machine tool frame body is fixedly connected to one side of the exchange table, a blanking frame is fixedly connected to one side of the exchange table, a positioning mechanism for positioning and exchanging pallets is arranged inside the exchange table, a guide rail is fixedly connected to the bottom surface of the inner wall of the machine tool frame body, there are two groups of the guide rails in total, the two groups of guide rails are symmetrically arranged, and a fixing component for fixing the pallet is arranged inside the guide rail;

[0006] The positioning mechanism includes an electric push rod B arranged inside the switching table. The upper end of the electric push rod B is fixedly connected with a lifting plate. A spring is fixedly connected to the upper surface of the lifting plate, and a suction cup is fixedly connected to the upper end of the spring. A blocking block is fixedly connected to the upper surface of the switching table, and the suction cup is arranged above the blocking block. A connecting frame A is fixedly connected to the outside of the lifting plate. There are two groups of the connecting frame A in total, and the two groups of the connecting frame A are symmetrically arranged. A connecting short rod is fixedly connected between the connecting frames A. A movable plate A is sleeved outside the connecting short rod. One end of the movable plate A is fixedly connected with a sleeve. A fixed shaft is fixedly connected to the inner wall of the switching table, and the sleeve is sleeved outside the fixed shaft. A telescopic plate is fixedly connected to the outside of the sleeve. One end of the telescopic plate is movably connected with a connecting vertical plate. A clamping plate is fixedly connected to one side of the connecting vertical plate. Side grooves are formed on the closer sides of the two clamping plates, and a transmission component for driving the tray is arranged inside the side grooves. A push plate is fixedly connected to the upper surface of the clamping plate away from the blanking rack, and a blanking component for guiding materials is arranged on the upper surface of the other clamping plate.

[0007] Preferably, a sliding groove is formed on the upper surface of the switching table, and the connecting vertical plate is slidably connected inside the sliding groove. Limit blocks are fixedly connected to both sides of the connecting vertical plate, and sliding grooves are formed on the inner wall of the sliding groove, and the limit blocks are slidably connected inside the sliding grooves.

[0008] Preferably, a telescopic rod is fixedly connected to the upper surface of the lifting plate, and the upper surface of the telescopic rod is fixedly connected to the bottom surface of the suction cup.

[0009] Preferably, the transmission component includes a vertical rod rotatably connected to the inner wall of the side groove. A transmission roller is fixedly connected to the outside of the vertical rod, and a buffer sleeve is fixedly connected to the outside of the transmission roller.

[0010] Preferably, a guardrail plate is fixedly connected to the upper surface of the switching table. A placing plate is fixedly connected to the upper surface of the switching table. An electric push rod A is fixedly connected to the upper surface of the placing plate. A pushing plate is fixedly connected to one end of the electric push rod A. A blanking baffle is fixedly connected to the upper surface of the blanking rack.

[0011] Preferably, the fixing component includes an installation shell slidably connected inside the guide rail. There are four groups of the installation shells in total, and the four groups of the installation shells are symmetrically arranged in pairs. A roller is rotatably connected to the bottom surface of the installation shell. A connecting cross bar is fixedly connected between two symmetric installation shells. A sleeve plate is fixedly connected to one side of the connecting cross bar. A positioning groove is formed on the upper surface of the sleeve plate. A connecting frame B is slidably connected to one end of the sleeve plate. An elastic convex block is arranged on the upper surface of the connecting frame B, and the elastic convex block corresponds to the positioning groove. An electric push rod C is externally connected to one side of the connecting frame B.

[0012] Preferably, a tray main body is arranged inside the machine tool frame body. A magnetic block is fixedly connected to the bottom surface of the tray main body. An electromagnet is fixedly connected to the upper surface of the installation shell, and the electromagnet corresponds to the magnetic block.

[0013] Preferably, the blanking assembly includes a mounting frame fixedly connected to the upper surface of the clamping plate. A blanking roller is rotatably connected inside the mounting frame. A motor is fixedly connected to the upper surface of the clamping plate. A rotating shaft is fixedly connected to the output end of the motor. A feeding roller is fixedly connected to the outer side of the rotating shaft. Transmission grooves are formed on one side of the two clamping plates close to each other. One end of the feeding roller penetrates through the transmission groove. A support assembly for supporting the tray is arranged on the upper surface of the exchange table. The support assembly includes a cylinder arranged inside the exchange table. A support rod is fixedly connected to the output end of the cylinder. A support plate is fixedly connected to one end of the support rod.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] In a horizontal CNC machine tool tray exchange structure proposed by the present utility model, when the tray is transferred and exchanged, the tray moves above the suction cup. The electric push rod B is turned on. The electric push rod B drives the lifting plate, the spring and the suction cup to move upward to support the bottom of the tray. The tray continues to move until the tray completely moves above the suction cup. The suction cup is turned on to fix the tray. Subsequently, the electric push rod B drives the lifting plate to contract and move downward, and at the same time drives one end of the movable plate A to move downward. The telescopic plate rotates towards the suction cup under the rotation of the sleeve, drives the connecting vertical plate and the clamping plate to clamp towards the middle. After one side of the clamping plate contacts the tray, the suction cup is closed. The position of the tray is corrected by using the clamping plate, and finally the purpose of ensuring the accuracy and stability of the exchanged and installed tray is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 It is a schematic diagram of the positioning mechanism structure of the present utility model;

[0018] Figure 3 It is a schematic diagram of the blanking assembly structure of the present utility model;

[0019] Figure 4 It is a schematic diagram of the transmission assembly structure of the present utility model;

[0020] Figure 5 It is a schematic diagram of the fixing component structure of the present utility model;

[0021] Figure 6 It is a schematic diagram of the tray main body structure of the present utility model;

[0022] Figure 7 It is a schematic diagram of the support assembly structure of the present utility model.

[0023] In the figure: 1. Switchboard; 11. Guardrail plate; 111. Block; 12. Chute; 13. Placing plate; 14. Electric push rod A; 141. Pushing plate; 15. Discharging rack; 16. Discharging baffle; 2. Machine tool frame; 21. Guide rail; 3. Tray body; 31. Magnet; 4. Positioning mechanism; 41. Electric push rod B; 42. Lifting plate; 421. Telescopic rod; 422. Spring; 43. Connecting frame A; 44. Suction cup; 45. Movable plate A; 451. Fixed shaft; 452. Sleeve; 46. Telescopic plate; 47. Connecting vertical plate; 471. Clamping plate; 472. Side groove; 473. Transmission assembly; 4731. Vertical rod; 4732. Transmission roller; 4733. Buffer sleeve; 474. Limit block; 475. Motor; 476. Feeding roller; 48. Pushing plate; 49. Discharging assembly; 491. Mounting frame; 492. Discharging roller; 5. Fixing component; 51. Mounting shell; 52. Electromagnet; 53. Roller; 54. Connecting cross bar; 55. Sleeve plate; 56. Positioning groove; 57. Elastic convex block; 58. Connecting frame B; 6. Support assembly; 61. Cylinder; 62. Support rod; 63. Support plate. Detailed implementation mode

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] To further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings.

[0026] Combined with Figure 1 , a horizontal numerical control machine tool pallet exchange structure includes a switchboard 1. One side of the switchboard 1 is fixedly connected to a machine tool frame 2. One side of the switchboard 1 is fixedly connected to a discharging rack 15. A positioning mechanism 4 for positioning and exchanging the pallet is arranged inside the switchboard 1. The bottom surface of the inner wall of the machine tool frame 2 is fixedly connected to a guide rail 21. There are two groups of the guide rails 21, and the two groups of the guide rails 21 are symmetrically arranged. A fixing component 5 for fixing the pallet is arranged inside the guide rail 21.

[0027] Next, the present invention will be further described in conjunction with the embodiments.

[0028] Combined with Figures 2 - 7, the positioning mechanism 4 includes an electric push rod B41 arranged inside the switching table 1. The upper end of the electric push rod B41 is fixedly connected with a lifting plate 42. A spring 422 is fixedly connected to the upper surface of the lifting plate 42. The upper end of the spring 422 is fixedly connected with a suction cup 44. A blocking block 111 is fixedly connected to the upper surface of the switching table 1. The suction cup 44 is arranged above the blocking block 111. A connecting frame A43 is fixedly connected to the outside of the lifting plate 42. There are two groups of the connecting frame A43 in total. The two groups of the connecting frame A43 are symmetrically arranged. A connecting short rod is fixedly connected between the connecting frame A43. A movable plate A45 is sleeved outside the connecting short rod. One end of the movable plate A45 is fixedly connected with a sleeve 452. A fixed shaft 451 is fixedly connected to the inner wall of the switching table 1. The sleeve 452 is sleeved outside the fixed shaft 451. A telescopic plate 46 is fixedly connected to the outside of the sleeve 452. One end of the telescopic plate 46 is movably connected with a connecting vertical plate 47. A clamping plate 471 is fixedly connected to one side of the connecting vertical plate 47. A side groove 472 is formed on the side of each of the two groups of the clamping plates 471 close to each other. A transmission component 473 for driving the tray is arranged inside the side groove 472. A push plate 48 is fixedly connected to the upper surface of the clamping plate 471 away from the blanking rack 15. A blanking component 49 for guiding materials is arranged on the upper surface of the other clamping plate 471. When transferring and exchanging the tray, the tray moves above the suction cup 44. The electric push rod B41 is turned on. The electric push rod B41 drives the lifting plate 42, the spring 422 and the suction cup 44 to move upward to support the bottom of the tray. The tray continues to move until the tray completely moves above the suction cup 44. The suction cup 44 is turned on to fix the tray. Then, the electric push rod B41 is used to drive the lifting plate 42 to contract and move downward, and at the same time drive one end of the movable plate A45 to move downward. The telescopic plate 46 rotates towards the suction cup 44 under the rotation action of the sleeve 452, driving the connecting vertical plate 47 and the clamping plate 471 to clamp towards the middle. After one side of the clamping plate 471 contacts the tray, the suction cup 44 is closed. The position of the tray is corrected by the clamping plate 471 to ensure the accuracy and stability of the subsequent exchange and installation of the tray.

[0029] A sliding groove 12 is formed on the upper surface of the switching table 1. The connecting vertical plate 47 is slidably connected inside the sliding groove 12. Limit blocks 474 are fixedly connected to both sides of the connecting vertical plate 47. A sliding groove is formed on the inner wall of the sliding groove 12. The limit blocks 474 are slidably connected inside the sliding groove. Through the arrangement of the sliding groove 12 and the limit blocks 474, it is ensured that the connecting vertical plate 47 stably slides inside the sliding groove 12, and the limit blocks 474 are used to ensure that the connecting vertical plate 47 stably clamps both sides of the tray.

[0030] A telescopic rod 421 is fixedly connected to the upper surface of the lifting plate 42. The upper surface of the telescopic rod 421 is fixedly connected to the bottom surface of the suction cup 44. Through the arrangement of the telescopic rod 421, a guiding effect is achieved when the spring 422 compresses and moves.

[0031] The transmission assembly 473 includes a vertical rod 4731 rotatably connected to the inner wall of the side groove 472. A transmission roller 4732 is fixedly connected to the outside of the vertical rod 4731, and a buffer sleeve 4733 is fixedly connected to the outside of the transmission roller 4732. Through the arrangement of the vertical rod 4731, the transmission roller 4732, and the buffer sleeve 4733, when the tray moves, the transmission roller 4732 rotates to play a guiding effect, and the buffer sleeve 4733 plays a buffering effect.

[0032] A guardrail plate 11 is fixedly connected to the upper surface of the exchange table 1. A placement plate 13 is fixedly connected to the upper surface of the exchange table 1. An electric push rod A14 is fixedly connected to the upper surface of the placement plate 13. One end of the electric push rod A14 is fixedly connected to a pusher plate 141. A blanking baffle 16 is fixedly connected to the upper surface of the blanking frame 15. When placing the tray, the electric push rod A14 is turned on to drive the pusher plate 141 to push the tray from the placement plate 13 towards the suction cup 44. The guardrail plate 11 and the blanking baffle 16 play a protective effect on the movement of the tray.

[0033] The fixing component 5 includes a mounting shell 51 slidably connected to the inside of the guide rail 21. There are a total of four groups of the mounting shells 51, and the four groups of the mounting shells 51 are symmetrically arranged in pairs. A roller 53 is rotatably connected to the bottom surface of the mounting shell 51. A connecting cross bar 54 is fixedly connected between two symmetric mounting shells 51. A sleeve plate 55 is fixedly connected to one side of the connecting cross bar 54. A positioning groove 56 is formed on the upper surface of the sleeve plate 55. One end of the sleeve plate 55 is slidably connected to a connecting frame B58. An elastic convex block 57 is arranged on the upper surface of the connecting frame B58, and the elastic convex block 57 corresponds to the positioning groove 56. An electric push rod C is externally connected to one side of the connecting frame B58. The bottom surface of the tray is supported by the four groups of mounting shells 51, and the roller 53 rolls inside the guide rail 21. The distance between the two connecting cross bars 54 is adjusted through the elastic convex block 57 and the positioning groove 56 to better support the tray.

[0034] A tray main body 3 is arranged inside the machine tool frame 2. A magnetic block 31 is fixedly connected to the bottom surface of the tray main body 3. An electromagnet 52 is fixedly connected to the upper surface of the mounting shell 51, and the electromagnet 52 corresponds to the magnetic block 31. By energizing the electromagnet 52, the tray main body 3 is fixed by the mutual attraction between the electromagnet 52 and the magnetic block 31.

[0035] The blanking component 49 includes a mounting frame 491 fixedly connected to the upper surface of the clamping plate 471. A blanking roller 492 is rotatably connected inside the mounting frame 491. A motor 475 is fixedly connected to the upper surface of the clamping plate 471. A rotating shaft is fixedly connected to the output end of the motor 475. A feeding roller 476 is fixedly connected to the outside of the rotating shaft. Transmission grooves are formed on one side of the two clamping plates 471 close to each other. One end of the feeding roller 476 penetrates through the transmission groove. A support component 6 for supporting the tray is arranged on the upper surface of the exchange table 1. The support component 6 includes a cylinder 61 arranged inside the exchange table 1. A support rod 62 is fixedly connected to the output end of the cylinder 61. A support plate 63 is fixedly connected to one end of the support rod 62. Through the arrangement of the motor 475 and the feeding roller 476, when discharging the tray, the motor 475 is turned on to drive the rotating shaft and the feeding roller 476 to rotate, driving the tray body 3 to be transported above the support plate 63. Then the cylinder 61 is turned on, and the cylinder 61 drives the support rod 62 and the support plate 63 to drive the tray body 3 to move upward. Then the electric push rod B41 is turned on to drive the two clamping plates 471 to move closer to the middle. The tray body 3 is pushed to one side of the blanking frame 15 by squeezing one side of the tray body 3 with the push plate 48. The rolling of the blanking roller 492 provides a guiding and buffering effect for the tray body 3.

[0036] Specifically, when transferring and exchanging the tray, the tray moves above the suction cup 44. The electric push rod B41 is turned on. The electric push rod B41 drives the lifting plate 42, the spring 422 and the suction cup 44 to move upward to support the bottom of the tray. The tray continues to move until the tray completely moves above the suction cup 44. The suction cup 44 is turned on to fix the tray. Then the electric push rod B41 drives the lifting plate 42 to contract and move downward, and at the same time drives one end of the movable plate A45 to move downward. The telescopic plate 46 rotates towards the suction cup 44 under the rotation of the sleeve 452, driving the connecting vertical plate 47 and the clamping plate 471 to clamp towards the middle. After one side of the clamping plate 471 contacts the tray, the suction cup 44 is closed, and the position of the tray is corrected by the clamping plate 471, finally achieving the purpose of ensuring the accuracy and stability of exchanging and installing the tray.

[0037] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A pallet exchange structure for a horizontal CNC machine tool, comprising an exchange platform (1), one side of the exchange platform (1) being fixedly connected to a machine tool frame (2), and one side of the exchange platform (1) being fixedly connected to a material unloading rack (15), characterized in that: The exchange table (1) is provided with a positioning mechanism (4) for positioning and exchanging the pallet, the bottom surface of the inner wall of the machine tool frame (2) is fixedly connected with a guide rail (21), two groups of the guide rails (21) are provided, the two groups of the guide rails (21) are symmetrically arranged, and a fixing component (5) for fixing the pallet is provided inside the guide rail (21); The positioning mechanism (4) comprises an electric push rod B (41) arranged inside the exchange platform (1), the upper end of the electric push rod B (41) is fixedly connected to a lifting plate (42), the upper surface of the lifting plate (42) is fixedly connected to a spring (422), the upper end of the spring (422) is fixedly connected to a suction cup (44), the upper surface of the exchange platform (1) is fixedly connected to a stop block (111), the suction cup (44) is arranged above the stop block (111), the outer side of the lifting plate (42) is fixedly connected to a connecting frame A (43), two groups of the connecting frames A (43) are arranged symmetrically, a connecting short rod is fixedly connected between the connecting frames A (43), the outer side of the connecting short rod is sleeved with a movable plate A (45), one end of the movable plate A (45) is fixedly connected to A sleeve (452) is connected, a fixed shaft (451) is fixedly connected to the inner wall of the exchange table (1), the sleeve (452) is sleeved on the outside of the fixed shaft (451), a telescopic plate (46) is fixedly connected to the outside of the sleeve (452), one end of the telescopic plate (46) is movably connected to a connecting vertical plate (47), one side of the connecting vertical plate (47) is fixedly connected to a clamping plate (471), a side of the two groups of clamping plates (471) close to each other are provided with a side groove (472), a transmission assembly (473) for transmitting the tray is arranged inside the side groove (472), a push plate (48) is fixedly connected to the upper surface of a group of clamping plates (471) away from the unloading rack (15), and a unloading assembly (49) for guiding materials is arranged on the upper surface of the other group of clamping plates (471).

2. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The upper surface of the exchange table (1) is provided with a slide groove (12), the connecting vertical plate (47) is slidably connected to the inside of the slide groove (12), both sides of the connecting vertical plate (47) are fixedly connected to limit blocks (474), the inner wall of the slide groove (12) is provided with a slide groove, and the limit blocks (474) are slidably connected to the inside of the slide groove.

3. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The upper surface of the lifting plate (42) is fixedly connected to a telescopic rod (421), and the upper surface of the telescopic rod (421) is fixedly connected to the bottom surface of the suction cup (44).

4. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The transmission assembly (473) comprises a vertical rod (4731) rotatably connected to the inner wall of the side groove (472), a transmission roller (4732) is fixedly connected to the outer side of the vertical rod (4731), and a buffer sleeve (4733) is fixedly connected to the outer side of the transmission roller (4732).

5. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The upper surface of the exchange platform (1) is fixedly connected to a guardrail plate (11), the upper surface of the exchange platform (1) is fixedly connected to a placement plate (13), the upper surface of the placement plate (13) is fixedly connected to an electric push rod A (14), one end of the electric push rod A (14) is fixedly connected to a push plate (141), and the upper surface of the unloading rack (15) is fixedly connected to an unloading baffle plate (16).

6. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The fixing component (5) comprises a mounting shell (51) slidably connected to the inside of the guide rail (21), and the mounting shell (51) is provided with four groups in total. The four groups of mounting shells (51) are symmetrically arranged in pairs, and the bottom surfaces of the mounting shells (51) are rotatably connected with rollers (53). A connecting cross bar (54) is fixedly connected between the two symmetrical groups of mounting shells (51), and a sleeve plate (55) is fixedly connected to one side of the connecting cross bar (54). A positioning groove (56) is provided on the upper surface of the sleeve plate (55). A connecting frame B (58) is slidably connected to one end of the sleeve plate (55), and an elastic protrusion (57) is provided on the upper surface of the connecting frame B (58). The elastic protrusion (57) is arranged corresponding to the positioning groove (56), and one side of the connecting frame B (58) is externally connected to an electric push rod C.

7. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: A tray body (3) is arranged inside the machine tool frame (2); a magnetic block (31) is fixedly connected to the bottom surface of the tray body (3); an electromagnet (52) is fixedly connected to the top surface of the mounting shell (51); and the electromagnet (52) and the magnetic block (31) are arranged correspondingly.

8. The pallet exchange structure of a horizontal CNC machine tool according to claim 1, characterized in that: The unloading assembly (49) comprises a mounting frame (491) fixedly connected to the upper surface of the clamping plate (471), a unloading roller (492) being rotatably connected inside the mounting frame (491), a motor (475) being fixedly connected to the upper surface of the clamping plate (471), a rotating shaft being fixedly connected to the output end of the motor (475), a feeding roller (476) being fixedly connected to the outer side of the rotating shaft, a transmission groove being provided on one side adjacent to the two groups of clamping plates (471), one end of the feeding roller (476) passing through the transmission groove, a supporting assembly (6) for supporting the tray being provided on the upper surface of the exchange table (1), the supporting assembly (6) comprising a cylinder (61) arranged inside the exchange table (1), a supporting rod (62) being fixedly connected to the output end of the cylinder (61), and a supporting plate (63) being fixedly connected to one end of the supporting rod (62).

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