A device with fixed-point character regional semi-transfer function

Abstract

The present invention discloses a device with a function of regional semi-transferring of fixed-point characters, comprising a mounting seat, a reeling roller provided on one side of the inner wall of the mounting seat, an anti-counterfeiting tape wound around the outer wall of the reeling roller, a transfer mechanism provided on the inner wall of the mounting seat capable of transferring characters of the anti-counterfeiting tape at a fixed point, the transfer mechanism comprising a lifting support assembly and a transfer assembly. The present invention belongs to the technical field of anti-counterfeiting tapes, and the purpose of the present invention is to solve the problem in the prior art that characters inside the anti-counterfeiting tape cannot be transferred at a fixed point. The technical effect achieved is: the present invention is provided with a transfer mechanism, and the positions and heights of the two mounting cylinders can be adjusted, so that the device for preparing the anti-counterfeiting tape with a function of transferring characters at a fixed point can transfer characters of the anti-counterfeiting tape at a fixed point. The present invention has higher use value, better economic benefits, and stronger environmental adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of anti-counterfeiting tapes, and in particular to a device with a fixed-point character regional semi-transfer function. Background Art

[0002] Sealing tape is a type of tape widely used in logistics, packaging and other fields. Its main function is to firmly bond packaging materials to ensure the safe transportation of items. Therefore, higher requirements are placed on the anti-counterfeiting function of the tape, and anti-counterfeiting tape is usually used for sealing boxes.

[0003] After the existing anti-counterfeiting tape is produced, the characters still need to be transferred. If there are errors in the characters on the anti-counterfeiting tape during the production process, or to meet the diverse needs of customers, it is often necessary to transfer the characters on the finished tape after the anti-counterfeiting tape is produced. However, the existing anti-counterfeiting tape production equipment can only peel off the entire anti-counterfeiting character layer on the tape, and cannot only transfer the erroneous characters, which increases the scrap rate and the production cost of the anti-counterfeiting tape.

[0004] In view of this: a device with a fixed-point character regional semi-transfer function. Summary of the Invention

[0005] To this end, the present invention provides a device with a fixed-point character regional semi-transfer function to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] According to the first aspect of the present invention, a device with a regional semi-transfer function of fixed-point characters includes a mounting seat, a reeling roller is provided on one side of the inner wall of the mounting seat, an anti-counterfeiting tape is wrapped around the outer wall of the reeling roller, a winding mechanism is provided on the other side of the inner wall of the mounting seat, and a transfer mechanism capable of transferring the anti-counterfeiting tape characters at a fixed point is provided on the inner wall of the mounting seat, and the transfer mechanism includes a lifting support assembly and a transfer assembly.

[0008] Furthermore, the anti-counterfeiting tape is sequentially provided with an adhesive layer, a character anti-counterfeiting layer, a protective layer and a tape body from bottom to top.

[0009] Furthermore, the winding mechanism includes a first motor and a limiting roller, the first motor is fixedly mounted on the outer wall of the mounting seat, the limiting roller is rotatably mounted on the inner wall of the mounting seat, a winding roller is rotatably mounted on one side of the inner wall of the mounting seat, and the output shaft of the first motor is fixedly connected to the winding roller.

[0010] Furthermore, the lifting support assembly includes an installation box, which is fixedly installed on the upper side of the mounting base. A second motor is fixedly installed on the inner wall of the installation box. The output shaft of the second motor is fixedly connected to a rotating shaft. There are two rotating shafts, and a second gear is arranged between the two rotating shafts.

[0011] Furthermore, first gears are fixedly installed on both sides of the outer wall of the rotating shaft, a support plate is provided on the upper side of the installation box, rack plates are fixedly installed on both sides of the lower end of the support plate, and the first gear is transmission-connected to the rack plate.

[0012] Furthermore, the transfer assembly includes a mounting cylinder, a third motor is fixedly mounted on the top of the inner wall of the mounting cylinder, the output shaft of the third motor is fixedly connected to a threaded rod, a lifting sleeve is threadedly connected to the outer wall of the threaded rod, and a pressing ring is fixedly connected to the lower end of the mounting cylinder.

[0013] Furthermore, there are two lifting sleeves, and the lower ends of the two lifting sleeves and the inner sides of the pressing ring are respectively provided with a first transfer head and a second transfer head. The lower end of the first transfer head is provided with a cutting strip, and the interior of the cutting strip is a hollow structure. The lower end of the second transfer head is provided with an adhesion part that matches the hollow structure of the inner wall of the cutting strip.

[0014] Furthermore, a slot is provided on the inner wall of the lower end of the lifting sleeve, and the first transfer head and the second transfer head can both be inserted into the inner wall of the slot. Limit rods are threadedly installed on the inner walls of both ends of the lifting sleeve, and the limit rods pass through and extend to the inside of the slot.

[0015] The present invention has the following advantages:

[0016] 1. The present invention is provided with a transfer mechanism. The first transfer head can cut the characters to be transferred. The second transfer head can approach the security tape and adhere to the cut characters to transfer the cut characters. The position and height of the two mounting cylinders can be adjusted. This allows the device for preparing security tape with a fixed-point character transfer function to transfer characters at fixed points on the security tape. The present invention has higher use value, better economic benefits, stronger environmental adaptability, and reduces costs and scrap rates to a certain extent.

[0017] 2. In the setting of the present invention, the first transfer head and the second transfer head are both detachably mounted on the lower side of the corresponding mounting tube through a limiting rod and a card slot, so that the first transfer head and the second transfer head are easy to replace, so that the equipment for preparing anti-counterfeiting tape with a fixed-point character transfer function can quickly replace the first transfer head and the second transfer head corresponding to the characters according to the shape of the characters to be transferred, and has higher use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a front perspective diagram of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0019] Figure 2 A three-dimensional diagram of the lifting support assembly of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0020] Figure 3 A three-dimensional diagram of a transfer component of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0021] Figure 4 This is a structural diagram of the first transfer head of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0022] Figure 5 This is a structural diagram of the second transfer head of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0023] Figure 6 This is a structural diagram of various parts inside the installation tube of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0024] Figure 7 A three-dimensional diagram of a lifting support assembly of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0025] Figure 8 A winding route map of an anti-counterfeiting tape for a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0026] Figure 9 This is a structural diagram of an anti-counterfeiting tape device with a fixed-point character regional semi-transfer function provided by the present invention.

[0027] Figure 10 A side perspective view of a device with a fixed-point character regional semi-transfer function provided by the present invention.

[0028] In the figure: mounting base 100; anti-counterfeiting tape 200; adhesive layer 201; character anti-counterfeiting layer 202; protective layer 203; tape body 204; first motor 300; limiting roller 310; winding roller 320; mounting box 400; second motor 410; rotating shaft 420; second gear 440; first gear 430; support plate 450; rack plate 460; mounting cylinder 500; third motor 510; threaded rod 520; lifting sleeve 530; pressing ring 560; first transfer head 540; second transfer head 550; limiting rod 570. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention. Example

[0030] like Figures 1 to 10 As shown, a device with a fixed-point character regional semi-transfer function in an embodiment of the first aspect of the present invention includes a mounting base 100, a reeling roller 110 is provided on one side of the inner wall of the mounting base 100, and an anti-counterfeiting tape 200 is wound around the outer wall of the reeling roller 110, and a reeling mechanism is provided on the other side of the inner wall of the mounting base 100. The inner wall of the mounting base 100 is provided with a transfer mechanism capable of transferring characters of the anti-counterfeiting tape 200 at a fixed point, and the transfer mechanism includes a lifting support component and a transfer component;

[0031] In the above embodiment, it should be noted that the anti-counterfeiting tape 200 is wound around the outer wall of the unwinding roller 110, and the unwinding roller 110 is rotatably mounted on the inner wall of one side of the mounting base 100. The friction between the unwinding roller 110 and the mounting base 100 is relatively large. In the absence of external force, the unwinding roller 110 will not rotate autonomously. A control screen is provided on the mounting base 100. The control screen adopts the existing technology, which is very mature in the existing technology, so it will not be described in detail.

[0032] The technical effect achieved by the above embodiment is that the anti-counterfeiting tape 200 outside the unwinding roller 110 can be pulled out and reeled up by the reeling mechanism, and during the reeling process, the characters are transferred at fixed points by the transfer mechanism. Example

[0033] like Figures 1 to 10 As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 1. In addition, the anti-counterfeiting tape 200 is sequentially provided with an adhesive layer 201, a character anti-counterfeiting layer 202, a protective layer 203 and a tape body 204 from bottom to top;

[0034] In the above embodiment, it should be noted that one side of the adhesive layer 201 is close to the transfer assembly;

[0035] The technical effect achieved by the above embodiment is that the lower end of the tape body 204 can contact with the lifting support component and be supported by the lifting support component, so that the transfer component can smoothly transfer characters. Example

[0036] like Figures 1 to 10As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 2. In addition, the winding mechanism includes a first motor 300 and a limiting roller 310. The first motor 300 is fixedly mounted on the outer wall of the mounting base 100. The limiting roller 310 is rotatably mounted on the inner wall of the mounting base 100. A winding roller 320 is rotatably mounted on one side of the inner wall of the mounting base 100. The output shaft of the first motor 300 is fixedly connected to the winding roller 320.

[0037] In the above embodiment, it should be noted that there are two limiting rollers 310, a transfer area is provided between the two limiting rollers 310, the limiting roller 310 is located between the unwinding roller 110 and the winding roller 320, and the limiting roller 310 is located on the upper side of the unwinding roller 110.

[0038] The technical effect achieved by the above embodiment is that when the first motor 300 is working, it can drive the winding roller 320 to rotate, so that the winding roller 320 can wind up the anti-counterfeiting tape 200. Example

[0039] like Figures 1 to 10 As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 3. In addition, the lifting support assembly includes a mounting box 400, which is fixedly mounted on the upper side of the mounting base 100. A second motor 410 is fixedly mounted on the inner wall of the mounting box 400. The output shaft of the second motor 410 is fixedly connected to a rotating shaft 420. There are two rotating shafts 420, and a second gear 440 is provided between the two rotating shafts 420.

[0040] In the above embodiment, it should be noted that there are four second gears 440, and the two outer second gears 440 are respectively fixedly mounted on the outer walls of the two rotating shafts 420. The four second gears 440 are meshed and connected to each other, so that the two rotating shafts 420 rotate in different directions, so that the first gears 430 on the outer walls of the two rotating shafts 420 can rotate in different directions. Notches are provided on both sides of the mounting box 400, and corresponding positions on the inner wall of the mounting base 100 are provided with sliding grooves. The first gear 430 is meshed and connected to the rack plate 460 through the notches.

[0041] The technical effect achieved by the above embodiment is: when the second motor 410 is working, it can drive the rotating shaft 420 to which it is fixed to rotate, and through the transmission connection of the second gear 440, the two rotating shafts 420 rotate synchronously in opposite directions, so that the first gears 430 on the outer walls of the two rotating shafts 420 rotate in opposite directions. Example

[0042] like Figures 1 to 10As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 4. In addition, first gears 430 are fixedly installed on both sides of the outer wall of the rotating shaft 420, a support plate 450 is provided on the upper side of the installation box 400, and rack plates 460 are fixedly installed on both sides of the lower end of the support plate 450. The first gear 430 is in transmission connection with the rack plate 460;

[0043] In the above embodiment, it should be noted that slide rails are fixedly mounted on both sides of the upper end of the mounting base 100, and the two sides of the rack plates 460 facing away from each other are slidably connected to the slide rails. Gear teeth are equidistantly mounted on the opposite sides of the rack plates 460, and the gear teeth on the outer wall of the first gear 430 are continuously meshed with the gear teeth on the rack plates 460.

[0044] The technical effect achieved by the above embodiment is: when the rotating shaft 420 rotates, the first gear 430 on the outer wall of the rotating shaft 420 can rotate, so that the rack plate 460 can move up and down, pushing the support plate 450 to move up and down, so that the support plate 450 can contact the side of the anti-counterfeiting tape 200 away from the adhesive layer 201. Example

[0045] like Figures 1 to 10 As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 5. In addition, the transfer component includes a mounting cylinder 500, a third motor 510 is fixedly mounted on the top of the inner wall of the mounting cylinder 500, the output shaft of the third motor 510 is fixedly connected to a threaded rod 520, the outer wall of the threaded rod 520 is threadedly connected to a lifting sleeve 530, and the lower end of the mounting cylinder 500 is fixedly connected to a pressing ring 560;

[0046] In the above embodiment, it should be noted that there are two mounting cylinders 500, and mounting plates are provided on the tops of the two mounting cylinders 500. Telescopic rods are fixedly installed on both sides of the lower ends of the mounting plates. The lower ends of the two telescopic rods are respectively fixedly connected to the corresponding mounting cylinders 500, and a moving assembly is provided on the upper side of the mounting plates. The longitudinal moving assembly includes a fourth motor, the output shaft of the fourth motor is fixedly connected to the first screw rod, the first screw rod is threadedly connected to the mounting plate, and the inner wall of the mounting plate is slidably connected to the guide rod. When the fourth motor is working, it can drive the first screw rod to rotate, so that the mounting plate outside the first screw rod moves back and forth, and the position of the mounting cylinder 500 is adjusted so that the lower end of the mounting cylinder 500 can be aligned with the character to be transferred;

[0047] The technical effect achieved by the above embodiment is: when the third motor 510 is working, it can drive the threaded rod 520 to rotate, so that the lifting sleeve 530 on the outer wall of the threaded rod 520 can move up and down, and the lifting sleeve 530 is slidably installed on the inner wall of the mounting tube 500, so that the lifting sleeve 530 can only move up and down. When the telescopic rod is working, it can drive the mounting tube 500 to move downward, so that the pressing ring 560 at the lower end of the mounting tube 500 can be pressed on the anti-counterfeiting tape 200 to prevent the anti-counterfeiting tape 200 from shifting when the characters are transferred. Example

[0048] like Figures 1 to 10 As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 6. In addition, there are two lifting sleeves 530. The lower ends of the two lifting sleeves 530 and the inner sides of the pressing ring 560 are respectively provided with a first transfer head 540 and a second transfer head 550. The lower end of the first transfer head 540 is provided with a cutting strip with a hollow structure inside the cutting strip. The lower end of the second transfer head 550 is provided with an adhesive portion that matches the hollow structure of the inner wall of the cutting strip.

[0049] In the above embodiment, it should be noted that an anti-adhesive release paper is provided at the lower end of the pressing ring 560, so that the pressing ring 560 can be pressed on the anti-counterfeiting tape 200. The cutting strip at the lower end of the first transfer head 540 can cut the characters to be transferred on the anti-counterfeiting tape 200. The hollow structure inside the cutting strip matches the shape of the characters to be transferred. The shape of the adhesive portion at the lower end of the second transfer head 550 matches the hollow structure inside the cutting strip.

[0050] The technical effect achieved by the above embodiment is: when the first transfer head 540 is pressed down, the characters can be cut, and the cutting strip can cut the character anti-counterfeiting layer 202 inside the anti-counterfeiting tape 200, so that a gap is created between the characters to be transferred and other parts of the anti-counterfeiting tape 200. At this time, the winding mechanism works and can wind up the anti-counterfeiting tape 200, so that the cut characters move to the lower side of the second transfer head 550. The second transfer head 550 is pressed down on the part cut by the cutting strip. The upward movement of the second transfer head 550 can drive the characters to move up and away from the anti-counterfeiting tape 200, and the characters can be transferred. When there are enough characters adhered to the lower side of the second transfer head 550, it should be noted that the characters transferred from the lower side of the second transfer head 550 are removed by existing technology, and the transferred characters can be peeled off by conventional methods such as manual or machine methods. Example

[0051] like Figures 1 to 10As shown, a device with a fixed-point character regional semi-transfer function includes all the contents of Example 7. In addition, a slot is formed on the inner wall of the lower end of the lifting sleeve 530, and the first transfer head 540 and the second transfer head 550 can both be inserted into the inner wall of the slot. The inner walls of both ends of the lifting sleeve 530 are threadedly mounted with limit rods 570, and the limit rods 570 pass through and extend to the inside of the slot.

[0052] In the above embodiment, it should be noted that the outer wall of the limiting rod 570 is provided with a thread, and the inner walls of both ends of the first transfer head 540 and the second transfer head 550 are provided with threaded holes that match the threads of the outer wall of the limiting rod 570. The outer wall of the lower end of the lifting sleeve 530 is provided with grooves on both sides, and the limiting rod 570 is installed in the inner wall of the groove, so that the limiting rod 570 can be hidden in the inner wall of the groove.

[0053] The technical effect achieved by the above embodiment is that the first transfer head 540 and the second transfer head 550 can be snapped into the slot, and at this time the limiting rod 570 can be threadedly installed into the inner walls of the threaded holes at both ends of the first transfer head 540 and the second transfer head 550.

[0054] Working principle: The anti-counterfeiting tape 200 passes through the upper side of the two limiting rollers 310, so that the lower side of the anti-counterfeiting tape 200 is in transmission contact with the limiting roller 310, and the anti-counterfeiting tape 200 is fixed to the outer wall of the winding roller 320 in a conventional manner. At the same time, the first motor 300 is started, and the winding roller 320 is driven by the first motor 300 to rewind the anti-counterfeiting tape 200. At the same time, the second motor 410 is started, and the second motor 410 drives the rotating shaft 420 to rotate. Through the transmission connection of the four second gears 440, the two rotating shafts 420 drive the first gears 430 on both sides to rotate, so that the rack plate 460 pushes the support plate 4 50 moves up, the support plate 450 moves to contact the anti-counterfeiting tape 200, and the anti-counterfeiting tape 200 is wound up by the winding roller 320, so that the part of the anti-counterfeiting tape 200 that needs to be modified characters moves to the upper side of the support plate 450, and the fourth motor is started to drive the first screw rod to rotate, and the first transfer head 540 is moved to the upper side of the characters, and then the mounting cylinder 500 corresponding to the upper side of the first transfer head 540 is pressed down by the telescopic rod, so that the pressing ring 560 is pressed on the adhesive layer 201, and the third motor 510 corresponding to the inside of the mounting cylinder 500 is started to drive the threaded rod 520 to rotate, so that the lifting sleeve 530 moves down, so that The first transfer head 540 moves downward, so that the cutting strip on the lower side of the first transfer head 540 cuts the anti-counterfeiting tape 200, and the cutting strip cuts to the character anti-counterfeiting layer 202. Then, the third motor 510 controls the first transfer head 540 to move upward, and the telescopic rod controls the installation cylinder 500 on the upper side of the first transfer head 540 to move upward. At the same time, the first motor 300 controls the winding roller 320 to rotate to rewind the anti-counterfeiting tape 200, so that the cut part on the anti-counterfeiting tape 200 moves horizontally to the lower side of the second transfer head 550, and the corresponding telescopic rod is activated to control the installation cylinder 500 outside the second transfer head 550 to move downward, so that the pressing roller 500 on the lower side thereof The pressure ring 560 is pressed on the anti-counterfeiting tape 200, and the corresponding third motor 510 is started to control the corresponding threaded rod 520 to rotate, so that the second transfer head 550 moves downward, and the lower side of the second transfer head 550 is bonded to the part cut by the first transfer head 540, and then the corresponding lifting sleeve 530 is controlled to move upward by the corresponding third motor 510, and the second transfer head 550 is bonded to the cut adhesion layer 201. The adhesion force between the second transfer head 550 and the cutting part is greater than the adhesion force between the character anti-counterfeiting layer 202 and the protective layer 203, so that the second transfer head 550 can smoothly drive the characters to move upward and transfer the characters.

Claims

1. A device with a fixed-point character regional semi-transfer function, characterized in that: The invention comprises a mounting seat (100), wherein a reeling roller (110) is provided on one side of the inner wall of the mounting seat (100), an anti-counterfeiting tape (200) is wound around the outer wall of the reeling roller (110), a reeling mechanism is provided on the other side of the inner wall of the mounting seat (100), a transfer mechanism capable of transferring characters of the anti-counterfeiting tape (200) at a fixed point is provided on the inner wall of the mounting seat (100), the transfer mechanism comprises a lifting support component and a transfer component, the transfer component comprises a mounting cylinder (500), a third motor (510) is fixedly installed on the top of the inner wall of the mounting cylinder (500), and the output of the third motor (510) is The output shaft is fixedly connected to a threaded rod (520), and the outer wall of the threaded rod (520) is threadedly connected to a lifting sleeve (530), and the lower end of the mounting tube (500) is fixedly connected to a pressing ring (560). There are two lifting sleeves (530), and a first transfer head (540) and a second transfer head (550) are respectively provided at the lower ends of the two lifting sleeves (530) and inside the pressing ring (560). The lower end of the first transfer head (540) is provided with a cutting strip, and the interior of the cutting strip is a hollow structure. The lower end of the second transfer head (550) is provided with an adhesive portion that matches the hollow structure of the inner wall of the cutting strip; The anti-counterfeiting tape (200) is sequentially arranged from bottom to top as an adhesive layer (201), a character anti-counterfeiting layer (202), a protective layer (203) and a tape body (204); When the first transfer head (540) is pressed down, the characters can be cut, and the cutting strip can cut the character anti-counterfeiting layer (202) inside the anti-counterfeiting tape (200), and a gap is generated between the characters to be transferred and other parts of the anti-counterfeiting tape (200). At this time, the reeling mechanism works and can reel the anti-counterfeiting tape (200). The cut characters move to the lower side of the second transfer head (550), and the second transfer head (550) is pressed down on the part cut by the cutting strip. The second transfer head (550) moves up to drive the characters to move up and away from the anti-counterfeiting tape (200), thereby transferring the characters.

2. The device with fixed-point character regional semi-transfer function according to claim 1, characterized in that: The lifting support assembly comprises an installation box (400), wherein the installation box (400) is fixedly installed on the upper side of the installation seat (100), a second motor (410) is fixedly installed on the inner wall of the installation box (400), an output shaft of the second motor (410) is fixedly connected to a rotating shaft (420), there are two rotating shafts (420), and a second gear (440) is provided between the two rotating shafts (420).

3. The device with fixed-point character regional semi-transfer function according to claim 2, characterized in that: First gears (430) are fixedly mounted on both sides of the outer wall of the rotating shaft (420), a support plate (450) is provided on the upper side of the installation box (400), rack plates (460) are fixedly mounted on both sides of the lower end of the support plate (450), and the first gear (430) is transmission-connected to the rack plate (460).

4. The device with fixed-point character regional semi-transfer function according to claim 1, characterized in that: The winding mechanism comprises a first motor (300) and a limiting roller (310), wherein the first motor (300) is fixedly mounted on the outer wall of the mounting seat (100), and the limiting roller (310) is rotatably mounted on the inner wall of the mounting seat (100).

5. The device with fixed-point character regional semi-transfer function according to claim 4, characterized in that: A winding roller (320) is rotatably mounted on one side of the inner wall of the mounting seat (100), and the output shaft of the first motor (300) is fixedly connected to the winding roller (320).

6. The device with fixed-point character regional semi-transfer function according to claim 5, characterized in that: A slot is provided on the inner wall of the lower end of the lifting sleeve (530), and both the first transfer head (540) and the second transfer head (550) can be snapped into the inner wall of the slot.

7. The device with fixed-point character regional semi-transfer function according to claim 6, characterized in that: Limiting rods (570) are threadedly mounted on the inner walls of both ends of the lifting sleeve (530), and the limiting rods (570) penetrate and extend to the inside of the slot.

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