Marking line adhesive tape paving tool

Abstract

The utility model discloses a ground marking adhesive tape paving tool, which comprises a paving roller vehicle and an adhesive tape releaser, the paving roller vehicle comprises a square rod, the upper end of the square rod is connected with a handle rod, and the lower end of the square rod is connected with a second bearing. The adhesive tape sequentially passes through the sawtooth pipe, the guide column, the first compression roller and the second compression roller, the sticky side of the adhesive tape is matched with sawteeth of the sawtooth pipe, the non-sticky side of the adhesive tape is matched with the guide column, the first compression roller and the second compression roller, the guide column can guide the adhesive tape, and the adhesive tape can be matched with the guide column more easily through the inclined face of the circular truncated cone column. The adhesive tape is laid on the ground after being bent, the first pressing roller wheel and the second pressing roller wheel conduct secondary pressing on the adhesive tape through the elastic force of the first spring and the self weight of the second pressing roller wheel respectively, and therefore the adhesive tape is more tightly matched with the ground, and the situation that virtual pasting is prone to occurring is avoided.

Description

Technical Field

[0001] The utility model relates to a tool, more precisely a tool for laying a landmark line adhesive tape. Background Art

[0002] Existing landmark line tape laying tools generally only have one pressing wheel. During the laying process, the tape is prone to loose contact with the ground, and during the laying process, the tape is prone to detach from the pressing wheel, causing the tape to be twisted into a strip. For example, Patent Publication No.: CN217231430U discloses a machine room landmark line tape laying tool. As shown in FIG7 , this device has only one pressing iron ring responsible for pressing the tape to the ground. This method can only press the tape once, and loose contact is prone to occur between the tape and the ground, causing people to easily kick the tape off the ground when passing by, or even trip people. Summary of the invention

[0003] The utility model aims to provide a landmark line tape laying tool, which can be used in the process of laying the landmark line tape, after the tape is pulled out from the tape roller, it passes through a serrated tube, a guide column, a first pressure roller wheel, and a second pressure roller wheel in sequence, wherein the adhesive side of the tape cooperates with the serrations of the serrated tube, and the non-adhesive side of the tape cooperates with the guide column, the first pressure roller wheel, and the second pressure roller wheel, the guide column can provide guidance for the tape, and the inclined surface of the truncated cone column is used to make it easier for the tape to cooperate with the guide column, thereby preventing the tape from easily detaching from the guide column, allowing the tape to be bent and laid on the ground, and the first pressure roller wheel and the second pressure roller wheel respectively use the elastic force of the first spring and the deadweight of the second pressure roller wheel to perform secondary pressure on the tape, thereby making the tape more closely cooperate with the ground and avoiding the situation of false sticking.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] The landmark line tape laying tool comprises a laying roller cart and a tape releaser, wherein the laying roller cart comprises a square rod, the upper end of the square rod is connected to the handle rod, the lower end of the square rod is connected to the second bearing, the outer ring of the second bearing is connected to the square rod, the inner ring of the second bearing is plugged into the first shaft, the inner ring of the second bearing is welded to the first shaft after being plugged in, and both ends of the first shaft are connected to a groove wheel, the groove wheel comprises a guide column, the first shaft passes through the central axis of the guide column, both ends of the guide column are connected to a frustum column, the frustum column is a frustum-shaped structure, the upper bottom end of the frustum column is connected to the guide column, the lower bottom end of the frustum column is connected to a circular plate, one side of the square rod is connected to the horizontal rod, one side of the horizontal rod is connected to the third bearing, the outer ring of the third bearing is matched with the horizontal rod, the inner ring of the third bearing is welded to the second shaft after being plugged in, and both ends of the second shaft are connected to a second pressure roller wheel, An elastic pressure wheel structure is installed on one side of the square rod, and the elastic pressure wheel structure includes a rotating plate, one side of the rotating plate is hinged to the square rod, and the other side of the rotating plate is installed with a first pressure roller wheel. The wheel frame of the first pressure roller wheel cooperates with the rotating plate, the middle part of the rotating plate is connected to the first spring, and one end of the first spring is connected to the middle part of the horizontal rod.

[0006] A tape releaser is connected to both sides of the square rod, and the tape releaser includes a positioning tube, one end of the positioning tube is connected to the outer side of the square rod, the interior of the positioning tube is connected to the interior of the square rod, a tape roller is arranged on the positioning tube, the tape roller is a tubular structure, the positioning tube can be inserted into the inner side of the tape roller, the tape roller is connected to the tape, the middle part of the positioning tube is connected to a limit block, a sliding tube is installed at one end of the positioning tube, the sliding tube is a tubular shell structure with one end sealed, the sliding tube is plugged into one end of the positioning tube, the positioning tube is inserted into the inner side of the sliding tube, the open end of the sliding tube and the limit block can cooperate to clamp the tape roller, and a transmission locking device is installed on the square rod. The transmission locking device comprises a brake wire tube and a square tube. The square tube is sleeved on the square rod and can slide on the square rod. The two ends of the brake wire tube are respectively connected to the outer side of the square rod and the inner side of the positioning tube. The middle part of the brake wire tube passes through the inside of the square rod and the inside of the positioning tube. The brake wire is plugged into the inside of the brake wire tube. One end of the brake wire is connected to the square tube, and the other end of the brake wire is connected to the sealing end of the sliding tube. A handle is connected to both sides of the square tube. A second spring is installed inside the sliding tube, one end of the second spring is connected to the sealing end of the sliding tube, and the other end of the second spring is connected to the end of the positioning tube. The second spring is in a compressed state.

[0007] The tape releaser of the utility model can facilitate the personnel to use the method of pinching the handle rod and the handle by hand to bring the handle rod and the handle closer to each other after the tape is laid, so as to pull the gate line, thereby driving the sliding tube and the limit block to cooperate to clamp the tape roller, so that in the process of moving the device, the tape roller is prevented from easily rotating uncontrollably, thereby preventing the pulled tape from winding back onto the tape roller, so that the personnel can quickly find the end of the tape.

[0008] In order to further achieve the purpose of the utility model, the following technical scheme can also be adopted: a tape anti-back-sticking device is installed on both sides of the square rod, and the tape anti-back-sticking device includes a positioning shaft, one end of the positioning shaft is connected to the square rod, a first bearing is installed on the positioning shaft, the inner ring of the first bearing is connected to the positioning shaft, the outer ring of the first bearing is connected to the serrated tube, the serrated tube is sleeved on the positioning shaft, the outer ring side of the first bearing is connected to the inner wall side of the serrated tube, the serrated tube is a tubular structure, and a plurality of serrated grooves are arranged on the outer periphery of the serrated tube, and the plurality of serrated grooves are evenly distributed on the side periphery of the serrated tube.

[0009] The utility model can use a sawtooth tube to be arranged between the tape roller and the guide column, so that after the end of the tape loses tension or is cut, the outer side of the sawtooth tube remains adhered to the middle of the tape, preventing the tape from winding back onto the tape roller, making it easier for personnel to find the end of the tape. The sawtooth tube of the utility model has a plurality of sawtooth grooves, so that the area where the sawtooth tube and the tape are adhered is prevented from being too large, which facilitates the tape to pass smoothly through the sawtooth tube area, and keeps the tape connected to the sawtooth tube.

[0010] The advantages of the utility model are as follows: in the process of laying the landmark line tape, after the tape is pulled out from the tape roller, it passes through the serrated tube, the guide column, the first pressure roller wheel, and the second pressure roller wheel in sequence, wherein the adhesive side of the tape cooperates with the serrations of the serrated tube, and the non-adhesive side of the tape cooperates with the guide column, the first pressure roller wheel, and the second pressure roller wheel. The guide column can provide guidance for the tape, and the inclined surface of the truncated cone column makes it easier for the tape to cooperate with the guide column, thereby preventing the tape from easily separating from the guide column, allowing the tape to be bent and laid on the ground, and the first pressure roller wheel and the second pressure roller wheel respectively utilize the elastic force of the first spring and the second pressure roller wheel to The dead weight of the second pressure roller presses the tape a second time, so that the tape fits more closely with the ground, avoiding the situation of false sticking, preventing people from easily kicking the tape off the ground when passing by, and avoiding people from tripping easily. When in use, after the end of the tape is pressed and bonded to the ground by the pressure of the first pressure roller and the second pressure roller, the person can push the handle bar to move the device forward, thereby pulling out the tape on the tape roller one by one to achieve paving. After use, the person can use scissors to cut the tape between the serrated tube and the guide column. At this time, the serrated tube keeps fitting with the tape, making it convenient for the person to quickly find the end of the tape when paving again. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 This is one of the structural diagrams of the utility model;

[0013] Figure 2 This is the second structural diagram of the utility model;

[0014] Figure 3 for Figure 2 A-direction enlarged structural schematic diagram;

[0015] Figure 4 for Figure 3 A schematic diagram of the cross-sectional enlarged structure along line BB;

[0016] Figure 5 This is the third structural diagram of the utility model;

[0017] Figure 6 for Figure 2 Schematic diagram of the enlarged structure of Part I;

[0018] Figure 7 It is a structural schematic diagram of the prior art patent publication number: CN217231430U;

[0019] Figure 8 This is a schematic diagram of the basic product structure of this application.

[0020] Labeled parts: 1 handle rod 2 square rod 3 square tube 4 handle 5 gate wire 6 gate wire tube 7 positioning tube 8 limit block 9 sliding tube 10 tape roller 11 tape 12 serrated tube 13 first bearing 14 round plate 15 round platform column 16 guide column 17 second bearing 18 first shaft 19 first spring 20 rotating plate 21 first pressure roller 22 horizontal rod 23 second pressure roller 24 third bearing 25 second shaft 26 second spring 27 positioning shaft. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0022] Embodiment 1: Landmark line tape laying tool, such as Figure 1-Figure 6As shown, it includes a paving roller cart and a tape releaser. The paving roller cart includes a square rod 2. The upper end of the square rod 2 is connected to the handle rod 1. The lower end of the square rod 2 is connected to the second bearing 17. The outer ring of the second bearing 17 is connected to the square rod 2. The inner ring of the second bearing 17 is plugged into the first shaft 18. The inner ring of the second bearing 17 is plugged into the first shaft 18 and then welded. Both ends of the first shaft 18 are connected to a groove wheel. The groove wheel includes a guide column 16. The first shaft 18 passes through the central axis of the guide column 16. , both ends of the guide column 16 are connected to a truncated cone column 15, the truncated cone column 15 is a truncated cone structure, the upper bottom end of the truncated cone column 15 is connected to the guide column 16, the lower bottom end of the truncated cone column 15 is connected to the circular plate 14, one side of the square rod 2 is connected to the horizontal rod 22, one side of the horizontal rod 22 is connected to the third bearing 24, the outer ring of the third bearing 24 cooperates with the horizontal rod 22, the inner ring of the third bearing 24 is welded after being plugged into the second shaft 25, and both ends of the second shaft 25 are connected to a second pressure roller 23, an elastic pressure wheel structure is installed on one side of the square rod 2, and the elastic pressure wheel structure includes a rotating plate 20, one side of the rotating plate 20 is hinged to the square rod 2, and the other side of the rotating plate 20 is installed with a first pressure roller 21, the wheel frame of the first pressure roller 21 cooperates with the rotating plate 20, the middle part of the rotating plate 20 is connected to the first spring 19, and one end of the first spring 19 is connected to the middle part of the horizontal rod 22. In the process of laying the landmark line tape of the utility model, after the tape 11 is pulled out from the tape roller 10, it passes through the sawtooth tube 12, the guide column 16, the first pressure roller 21, and the second pressure roller 23 in sequence, wherein the adhesive side of the tape 11 cooperates with the sawteeth of the sawtooth tube 12, and the non-adhesive side of the tape 11 cooperates with the guide column 16, the first pressure roller 21, and the second pressure roller 23. The guide column 16 can provide guidance for the tape 11, and the inclined surface of the truncated cone column 15 makes it easier for the tape 11 to cooperate with the guide column 16, thereby preventing the tape 11 from easily separating from the guide column 16, allowing the tape 11 to be bent and laid on the ground, and the first pressure roller 21 and the second pressure roller 23 respectively utilize the first spring 19 The elastic force and the deadweight of the second pressure roller 23 press the adhesive tape 11 a second time, so that the adhesive tape fits more closely with the ground, avoiding the situation of false sticking, avoiding the adhesive tape being kicked off the ground easily when people pass by, and avoiding people being tripped easily. When in use, after the end of the adhesive tape 11 is pressed and bonded to the ground by the pressure of the first pressure roller 21 and the second pressure roller 23, the person can push the handle bar 1 to move the device forward, thereby gradually pulling out the adhesive tape 11 on the tape roller 10 to achieve paving. After use, the person can use scissors to cut the adhesive tape 11 between the serrated tube 12 and the guide column 16. At this time, the serrated tube 12 maintains the cooperation with the adhesive tape 11, which is convenient for the person to quickly find the end of the adhesive tape 11 when paving again.Specific implementation of material selection and feasibility analysis: The samples we actually made use the drawings in the specification as drawings, and are implemented according to the proportions and matching methods of the various components in the drawings in the specification. The connection is a common connection method such as strong adhesive connection, welding, riveting, flange connection, and one-piece molding connection. In actual production, the corresponding connection method, thickness and strength of the connection point can be selected according to the actual connection strength requirements without creativity. The first spring 19 is in a compressed state.

[0023] Embodiment 2: Landmark line tape laying tool, such as Figure 1-Figure 5As shown, it includes a paving roller cart and a tape releaser. The paving roller cart includes a square rod 2. The upper end of the square rod 2 is connected to the handle rod 1. The lower end of the square rod 2 is connected to the second bearing 17. The outer ring of the second bearing 17 is connected to the square rod 2. The inner ring of the second bearing 17 is plugged into the first shaft 18. The inner ring of the second bearing 17 is plugged into the first shaft 18 and then welded. Both ends of the first shaft 18 are connected to a groove wheel. The groove wheel includes a guide column 16. The first shaft 18 passes through the central axis of the guide column 16. , both ends of the guide column 16 are connected to a truncated cone column 15, the truncated cone column 15 is a truncated cone structure, the upper bottom end of the truncated cone column 15 is connected to the guide column 16, the lower bottom end of the truncated cone column 15 is connected to the circular plate 14, one side of the square rod 2 is connected to the horizontal rod 22, one side of the horizontal rod 22 is connected to the third bearing 24, the outer ring of the third bearing 24 cooperates with the horizontal rod 22, the inner ring of the third bearing 24 is welded after being plugged into the second shaft 25, and both ends of the second shaft 25 are connected to a second pressure roller 23, an elastic pressure wheel structure is installed on one side of the square rod 2, and the elastic pressure wheel structure includes a rotating plate 20, one side of the rotating plate 20 is hinged to the square rod 2, and the other side of the rotating plate 20 is installed with a first pressure roller 21, the wheel frame of the first pressure roller 21 cooperates with the rotating plate 20, the middle part of the rotating plate 20 is connected to the first spring 19, and one end of the first spring 19 is connected to the middle part of the horizontal rod 22. A tape releaser is connected to both sides of the square rod 2, and the tape releaser includes a positioning tube 7, one end of the positioning tube 7 is connected to the outer side of the square rod 2, the interior of the positioning tube 7 is connected to the interior of the square rod 2, a tape roller 10 is arranged on the positioning tube 7, the tape roller 10 is a tubular structure, the positioning tube 7 can be inserted into the inner side of the tape roller 10, a tape 11 is connected to the tape roller 10, a limiting block 8 is connected to the middle part of the positioning tube 7, a sliding tube 9 is installed at one end of the positioning tube 7, the sliding tube 9 is a tubular shell structure with one end sealed, the sliding tube 9 is plugged into one end of the positioning tube 7, the positioning tube 7 is inserted into the inner side of the sliding tube 9, the open end of the sliding tube 9 and the limiting block 8 can cooperate to clamp the tape roller 10, and a transmission locking device is installed on the square rod 2 The transmission locking device comprises a brake wire tube 6 and a square tube 3. The square tube 3 is sleeved on the square rod 2, and the square tube 3 can slide on the square rod 2. The two ends of the brake wire tube 6 are respectively connected to the outer side of the square rod 2 and the inner side of the positioning tube 7. The middle part of the brake wire tube 6 passes through the inside of the square rod 2 and the inside of the positioning tube 7. The brake wire 5 is inserted into the inside of the brake wire tube 6. One end of the brake wire 5 is connected to the square tube 3, and the other end of the brake wire 5 is connected to the sealed end of the sliding tube 9. A handle 4 is connected to both sides of the square tube 3. A second spring 26 is installed inside the sliding tube 9, one end of the second spring 26 is connected to the sealed end of the sliding tube 9, and the other end of the second spring 26 is connected to the end of the positioning tube 7. The second spring 26 is in a compressed state.

[0024] The tape releaser of the present invention can facilitate personnel to use the method of pinching the handle bar 1 and the handle 4 by hand to bring the handle bar 1 and the handle 4 closer to each other after the tape is laid, so as to pull the gate line 5, thereby driving the sliding tube 9 and the limit block 8 to cooperate to clamp the tape roller 10, so that in the process of moving the device, the tape roller 10 is prevented from easily rotating uncontrollably, thereby preventing the pulled tape 11 from winding back onto the tape roller 10, so that personnel can quickly find the end of the tape 11.

[0025] Example 3: Landmark tape laying tool, such as Figure 1-Figure 5 As shown, it includes a paving roller cart and a tape releaser. The paving roller cart includes a square rod 2. The upper end of the square rod 2 is connected to the handle rod 1. The lower end of the square rod 2 is connected to the second bearing 17. The outer ring of the second bearing 17 is connected to the square rod 2. The inner ring of the second bearing 17 is plugged into the first shaft 18. The inner ring of the second bearing 17 is plugged into the first shaft 18 and then welded. Both ends of the first shaft 18 are connected to a groove wheel. The groove wheel includes a guide column 16. The first shaft 18 passes through the central axis of the guide column 16. , both ends of the guide column 16 are connected to a truncated cone column 15, the truncated cone column 15 is a truncated cone structure, the upper bottom end of the truncated cone column 15 is connected to the guide column 16, the lower bottom end of the truncated cone column 15 is connected to the circular plate 14, one side of the square rod 2 is connected to the horizontal rod 22, one side of the horizontal rod 22 is connected to the third bearing 24, the outer ring of the third bearing 24 cooperates with the horizontal rod 22, the inner ring of the third bearing 24 is welded after being plugged into the second shaft 25, and both ends of the second shaft 25 are connected to a second pressure roller 23, an elastic pressure wheel structure is installed on one side of the square rod 2, and the elastic pressure wheel structure includes a rotating plate 20, one side of the rotating plate 20 is hinged to the square rod 2, and the other side of the rotating plate 20 is installed with a first pressure roller 21, the wheel frame of the first pressure roller 21 cooperates with the rotating plate 20, the middle part of the rotating plate 20 is connected to the first spring 19, and one end of the first spring 19 is connected to the middle part of the horizontal rod 22. A tape anti-back-adhesion device is installed on both sides of the square rod 2, and the tape anti-back-adhesion device includes a positioning shaft 27, one end of the positioning shaft 27 is connected to the square rod 2, and a first bearing 13 is installed on the positioning shaft 27. The inner ring of the first bearing 13 is connected to the positioning shaft 27, and the outer ring of the first bearing 13 is connected to the sawtooth tube 12. The sawtooth tube 12 is sleeved on the positioning shaft 27, and the outer ring side of the first bearing 13 is connected to the inner wall side of the sawtooth tube 12. The sawtooth tube 12 is a tubular structure, and a plurality of sawtooth grooves are arranged on the outer periphery of the sawtooth tube 12, and the plurality of sawtooth grooves are evenly distributed on the side periphery of the sawtooth tube 12.

[0026] The utility model can use the sawtooth tube 12 to be arranged between the tape roller 10 and the guide column 16, so that after the end of the tape 11 loses tension or is cut, the outer side of the sawtooth tube 12 remains adhered to the middle of the tape 11, preventing the tape 11 from winding back onto the tape roller 10, making it easier for people to find the end of the tape. The sawtooth tube 12 of the utility model has a plurality of sawtooth grooves, so that the sawtooth tube 12 and the tape 11 are prevented from adhering to an excessively large area, which, on the one hand, facilitates the tape 11 to pass smoothly through the sawtooth tube 12 area, and on the other hand, keeps the tape 11 connected to the sawtooth tube 12.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention.

Claims

1. Landmark tape laying tool, characterized by: The invention comprises a paving roller cart and a tape releaser, wherein the paving roller cart comprises a square rod (2), the upper end of the square rod (2) is connected to a handle rod (1), the lower end of the square rod (2) is connected to a second bearing (17), the outer ring of the second bearing (17) is connected to the square rod (2), the inner ring of the second bearing (17) is plugged into a first shaft (18), the inner ring of the second bearing (17) is plugged into the first shaft (18) and then welded, both ends of the first shaft (18) are connected to a groove wheel, the groove wheel comprises a guide column (16), the first shaft (18) passes through the central shaft portion of the guide column (16), and the guide column Both ends of the square rod (16) are connected to a truncated cone column (15), the truncated cone column (15) is a truncated cone structure, the upper bottom end of the truncated cone column (15) is connected to the guide column (16), the lower bottom end of the truncated cone column (15) is connected to the circular plate (14), one side of the square rod (2) is connected to the horizontal rod (22), one side of the horizontal rod (22) is connected to the third bearing (24), the outer ring of the third bearing (24) is matched with the horizontal rod (22), the inner ring of the third bearing (24) is plugged and welded with the second shaft (25), and both ends of the second shaft (25) are connected to a second pressure roller wheel (23), An elastic pressure wheel structure is installed on one side of the square rod (2), and the elastic pressure wheel structure comprises a rotating plate (20), one side of the rotating plate (20) is hinged to the square rod (2), and a first pressure roller (21) is installed on the other side of the rotating plate (20), the wheel frame of the first pressure roller (21) cooperates with the rotating plate (20), the middle part of the rotating plate (20) is connected to the first spring (19), and one end of the first spring (19) is connected to the middle part of the horizontal rod (22).

2. The landmark tape laying tool according to claim 1, characterized in that: Both sides of the square rod (2) are connected to a tape releaser, the tape releaser comprising a positioning tube (7), one end of the positioning tube (7) being connected to the outer side of the square rod (2), the interior of the positioning tube (7) being communicated with the interior of the square rod (2), a tape roller (10) being arranged on the positioning tube (7), the tape roller (10) being a tubular structure, the positioning tube (7) being capable of being inserted into the inner side of the tape roller (10), the tape roller (10) being connected with a tape (11), the middle part of the positioning tube (7) being connected with a limit block (8), one end of the positioning tube (7) being equipped with a sliding tube (9), the sliding tube (9) being a tubular shell structure with one end sealed, the sliding tube (9) being plug-fitted with one end of the positioning tube (7), the positioning tube (7) being inserted into the inner side of the sliding tube (9), the open end of the sliding tube (9) and the limit block (8) being capable of being matched to clamp the tape roller (10), and a transmission locking device being installed on the square rod (2). The transmission locking device comprises a brake wire tube (6) and a square tube (3). The square tube (3) is sleeved on the square rod (2). The square tube (3) can slide on the square rod (2). The two ends of the brake wire tube (6) are respectively connected to the outer side of the square rod (2) and the inner side of the positioning tube (7). The middle part of the brake wire tube (6) passes through the inside of the square rod (2) and the inside of the positioning tube (7). The brake wire (5) is inserted into the inside of the brake wire tube (6). One end of the brake wire (5) is connected to the square tube (3). The other end of the brake wire (5) is connected to the sealed end of the sliding tube (9). Both sides of the square tube (3) are connected to a handle (4). A second spring (26) is installed inside the sliding tube (9). One end of the second spring (26) is connected to the sealed end of the sliding tube (9). The other end of the second spring (26) is connected to the end of the positioning tube (7). The second spring (26) is in a compressed state.

3. The landmark tape laying tool according to claim 1, characterized in that: An adhesive tape anti-back-adhesion device is installed on both sides of the square rod (2), and the adhesive tape anti-back-adhesion device comprises a positioning shaft (27), one end of the positioning shaft (27) is connected to the square rod (2), a first bearing (13) is installed on the positioning shaft (27), an inner ring of the first bearing (13) is connected to the positioning shaft (27), an outer ring of the first bearing (13) is connected to a sawtooth tube (12), the sawtooth tube (12) is sleeved on the positioning shaft (27), a side circumference of the outer ring of the first bearing (13) is connected to a side circumference of an inner wall of the sawtooth tube (12), the sawtooth tube (12) is a tubular structure, a plurality of sawtooth grooves are arranged on the outer circumference of the sawtooth tube (12), and the plurality of sawtooth grooves are evenly distributed on the side circumference of the sawtooth tube (12).

Images