Packaging box binding tape removing and stacking all-in-one machine

Abstract

The utility model discloses a packaging box binding tape removing and stacking all-in-one machine. The all-in-one machine comprises a cutting structure, a tape collecting clamp, a cutting supporting unit, a stacking supporting unit, a stacking bracket, a limiting assembly and a conveying unit. The cutting structure is used for cutting the binding tape; the tape collecting clamp is used for clamping and pulling away the binding tape; the cutting supporting unit is located between the cutting structure and the belt collecting clamp and supports the packaging box. The stacking supporting unit is used for jacking packaging boxes. The conveying unit conveys the packaging boxes from the cutting supporting unit to the stacking supporting unit. And the stacking bracket is used for supporting the packaging box jacked up by the stacking supporting unit. Through reasonable arrangement of tape cutting, tape collecting and stacking, automation and integration of binding tape removing and stacking are achieved, the structure is compact, and the cost is low; the tape cutting and collecting operation is simple and reliable, the efficiency is high, and the device is suitable for one-time removing of the binding tape under various binding conditions; in addition, the stacking quality and the stacking number are guaranteed through combined operation of the stacking bracket and the limiting assembly.

Description

Technical Field

[0001] The present application relates to the technical field of packaging box unpacking, and in particular to an all-in-one machine for unpacking and stacking packaging box binding straps. Background Art

[0002] For the convenience of storage and transportation, the flat raw materials of the packaging box are strapped with packaging tape before the packaging box is unpacked and formed. Before the raw materials of the packaging box are transported and unpacked, the strapping tape on the incoming materials needs to be cut, collected and stacked. At present, the manual cutting and collecting of the strapping tape of the packaging box and stacking are labor-intensive and inefficient. The automatic strap cutting device using CCD recognition, such as patent CN216186686U, although it realizes the automation of strap cutting and collecting, has the problem of high cost and cannot realize the integration of strap cutting, collecting and stacking. Utility Model Content

[0003] The present application provides a packaging box binding strap untying and stacking integrated machine, which realizes the automation and integration of binding strap untying and stacking, and has a simple and compact structure, low cost, simple and reliable operation, and high efficiency. The specific scheme is as follows:

[0004] A packaging box binding belt unstacking integrated machine, comprising a cutting structure, a belt collecting clamp, a cutting support unit, a stacking support unit, a stacking bracket, a limit assembly and a conveying unit;

[0005] The cutting structure includes at least one grinding wheel capable of rotating at high speed, and the grinding wheel capable of moving along the x-axis and y-axis directions to cut the binding tape;

[0006] The belt collecting clamp comprises at least one pair of openable and closable clamping plates, the contact surfaces of the clamping plates are tightly fitted and not smooth, and can be moved along the x-axis and y-axis directions to clamp and remove the binding belt;

[0007] The cutting support unit is located between the cutting structure and the tape collecting clamp, and can be extended and retracted to support the packaging box;

[0008] The stacking support unit can be adjusted in height to lift the packaging box;

[0009] The stacking brackets are located above both sides of the stacking support unit, and the stacking brackets can be extended and retracted to support the packaging boxes that have been lifted up by the stacking support unit;

[0010] The limiting component is located at the rear of the conveying unit to limit the conveying position of the packaging box;

[0011] The conveying unit conveys the packaging box from the cutting support unit to the stacking support unit.

[0012] Furthermore, the packaging box binding strap unstacking integrated machine also includes a cutting push plate, which can be extended and retracted along the y-axis to push the packaging box to be flush with the cutting structure side, and the cutting push plate and the belt collecting clamp are located on the same side of the cutting support unit.

[0013] Furthermore, the movement of the grinding wheel in the y-axis direction can be finely adjusted.

[0014] Furthermore, the clamping plate includes a fixed clamping plate and a sliding clamping plate that moves on the x-axis, and the number and position of the fixed clamping plate and the sliding clamping plate can be adjusted.

[0015] Furthermore, when the number of the splints is not less than 2 pairs, the distance between adjacent fixed splints is equal to the distance between corresponding adjacent sliding splints, thereby achieving closure of multiple pairs of splints.

[0016] Furthermore, the number and position of the grinding wheel, binding belt and clamping plate correspond one to one, so that the binding belt can be cut and clamped at one time.

[0017] Furthermore, the contact surface of the clamping plate is a wedging tooth surface.

[0018] Furthermore, the clamping plate can also be located below the y-axis conveying structure.

[0019] Furthermore, the stacking bracket includes a telescopic rod, a transmission rod and a power device, and the transmission rod is respectively connected to the power device and the telescopic rod to achieve the extension and retraction of the telescopic rod.

[0020] Furthermore, the limiting assembly includes a limiting baffle and a telescopic structure with adjustable vertical height connected to the limiting baffle.

[0021] Beneficial effects: The integrated machine for removing and stacking the packing box binding straps in the present application realizes the automation and integration of the removal of the packing box binding straps and the stacking of the packing boxes through the reasonable arrangement of the cutting, collecting and stacking functions. The device has a simple and compact structure and low cost. The cooperation between the cutting push plate and the collecting unit makes the cutting and collecting operations simple, reliable and efficient. The cutting and collecting structures are suitable for the one-time removal of the binding straps in various binding situations. In addition, the combination of the stacking bracket and the limit assembly ensures the quality and quantity of the stacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the integrated machine for removing the packing box strapping straps;

[0023] Figure 2 is a schematic diagram of the cutting structure;

[0024] Figure 3 is a schematic diagram of the tape collection fixture;

[0025] Figure 4is a schematic diagram of a sliding splint and a fixed splint;

[0026] Figure 5 is a schematic diagram of a cutting support unit;

[0027] Figure 6 is a schematic diagram of a stacking support unit;

[0028] Figure 7 is a schematic diagram of a stacking bracket;

[0029] Figure 8 A schematic diagram of a limiter assembly. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described in the present application are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0031] The following is combined with Figure 1-8 The packaging box binding strap removing and stacking integrated machine in this application is described in detail.

[0032] like Figure 1 As shown, a packaging box binding strap unstacking integrated machine includes a cutting structure 1, a strap collecting clamp 2, a cutting support unit 3, a stacking support unit 4, a cutting push plate 6, a stacking bracket 7, a limiting assembly 8 and a conveying unit 9.

[0033] like Figure 2 As shown, the cutting structure 1 includes at least one grinding wheel 101 that can rotate at high speed to cut the binding strap 116; in the embodiment of the present application, the grinding wheel 101 can be selected from diamond cutting discs, etc., and the motor 102 drives the grinding wheel 101 to rotate at high speed, so that the binding strap 116 can be ground off by contacting the grinding wheel 101, and the cutting is completed, thereby realizing the cutting of the flexible binding strap 116, which is not only suitable for cutting the binding strap 116 in a tight state, but also suitable for cutting the binding strap 116 in a loose state.

[0034] The number and position of the grinding wheel 101 correspond to the number and position of the binding belt 116, so as to realize the cutting of one binding belt 116 or the cutting of multiple binding belts 116 at one time. When there is only one binding belt 116, one grinding wheel 101 completes the cutting; when there are multiple binding belts 116, the number of grinding wheel 101 is equal to the number of binding belts 116, and the distance between adjacent grinding wheel 101 is equal to the distance between corresponding binding belts 116. By adjusting the position of the grinding wheel 101 on the x-axis, the position of the grinding wheel 101 and the binding belt 116 can be aligned, so as to cut multiple binding belts at one time. For the cutting of binding belts with a fixed distance during mechanical binding, the efficiency of cutting the belt can be improved.

[0035] The grinding wheel 101 can move along the x-axis and y-axis directions. Figure 2 As shown, the packaging box binding strap cutting structure 1 also includes a fixing seat 103, and the grinding wheel 101 is fixed on the fixing seat 103. The position of the grinding wheel 101 in the x-axis direction on the fixing seat 103 can be adjusted, which is suitable for aligning the grinding wheel 101 with the binding strap 116 when cutting multiple binding straps at one time. The packaging box binding strap cutting structure 1 also includes a cutting fixing plate 108, and the fixing seat 103 can move along the x-axis or y-axis direction on the cutting fixing plate 108 to realize the movement of the grinding wheel 101 along the x-axis or y-axis direction. The bottom plate of the fixed seat 103 is provided with a slider 104, and the cutting fixed plate 108 is provided with a slide rail 105 and a cylinder 106 corresponding to the slider 104. The cylinder 106 is connected to the self-centering connector 111. A fixed block 107 is provided at a corresponding position of the bottom plate of the fixed seat 103. According to the direction of the slide rail 105, the fixed seat 103 in the embodiment moves in the x-axis direction to realize the movement of the grinding wheel 101 in the x-axis direction. The cutting fixed plate 108 can move along the x-axis or y-axis in the horizontal plane, and the moving directions of the fixed seat 103 and the cutting fixed plate 108 are perpendicular to each other. Figure 2 As shown, a slider 109 and a fixing block 114 are arranged on the bottom plate of the cutting fixing plate 108, and the cylinder 113 is connected to the fixing block 114 by a bolt 112, driving the slider 109 to move on the slide rail 110, and the bolt 112 is used for fine distance adjustment. In this embodiment, according to the direction of the slide rail 110, the cutting fixing plate 108 moves in the y-axis direction, and the distance between the grinding wheel 101 and the packaging box 115 can be adjusted.

[0036] In addition, the position of the cutting fixing plate 108 in the y-axis direction is finely adjusted by the bolt 112 to achieve fine movement of the grinding wheel 101 in the y-axis direction. This is suitable for the grinding wheel 101 to be finely adjusted in the y-axis direction when the grinding wheel 101 is worn.

[0037] Figure 2 The structure in is just one way to cut structure 1.

[0038] like Figure 3 As shown, the belt collecting clamp 2 includes at least one pair of openable clamping plates 201, and the contact surfaces of the clamping plates 201 are tightly fitted and not smooth. Figure 4 As shown, in order to clamp tightly during clamping, the contact surface of the clamping plate is closely fitted. Considering that the surface of the binding belt is generally smooth, in order to increase the friction between the binding belt 116 and the clamping plate 201 so that it is not easy to fall off during extraction, the contact surface of the clamping plate 201 is not smooth. In order to obtain a better anti-falling effect, the contact surface of the clamping plate 201 is a wedging tooth surface structure. In this embodiment, the tooth surface is a rectangular tooth surface, and a sharp tooth surface can also be selected. The top 209 of the clamping plate 201 is flush and vertical, so that the top 209 of the clamping plate 201 is closely fitted with the packaging box during the opening and closing process of the clamping plate 201, which is convenient for clamping the binding belt 116.

[0039] like Figure 3 As shown, the clamping plate 201 moves along the x-axis and y-axis directions in the horizontal plane. The clamping plate 201 includes a fixed clamping plate 202 and a sliding clamping plate 203 that moves on the x-axis. The number and position of the fixed clamping plate 202 and the sliding clamping plate 203 can be adjusted. The movement of the sliding clamping plate 203 on the x-axis realizes the opening and closing of the clamping plate 201. The fixed clamping plate 202 is fixed on the tape-receiving base plate 206, and the sliding clamping plate 203 is fixed on the transmission rod 204. The power device 205 drives the transmission rod 204 to move along the x-direction through the fixed block 207 fixed on the transmission rod 204, so that the sliding clamping plate 203 moves in the x-direction to realize the opening and closing of the clamping plate 201. The tape-receiving base plate 206 is connected to the y-axis transmission structure 208, and the tape-receiving base plate 206 can move along the y-axis, so that the clamping plate 201 can move in the y-axis direction and be pulled out after taking the tape. Figure 3 It is a feasible way to move the clamp 201 along the y-axis. In order to clamp multiple binding straps 116, the number of fixed clamps 202 and sliding clamps 203 can be adjusted according to the number of binding straps 116. In addition, in order to ensure that the clamp 201 is aligned with the binding strap for easy clamping, the position of the fixed clamp 202 on the belt receiving bottom plate 206 along the x-axis and the position of the sliding clamp 203 on the transmission rod 204 along the x-axis can be adjusted. When the number of clamps 201 is not less than 2 pairs, the distance between adjacent fixed clamps 202 is equal to the distance between corresponding adjacent sliding clamps 203, so that multiple pairs of clamps 201 can be closed. When the movement of multiple sliding clamps 203 is controlled by the transmission rod 204, the equal spacing allows each pair of clamps 201 to be closed and clamped, ensuring the reliability of clamping multiple binding straps at one time, and the structure is simple.

[0040] In order to achieve a better extraction effect, the splint 201 in the present application can also be located below the y-axis conveying structure 208. At this time, the belt collecting bottom plate 206 is also located below the y-axis conveying structure 208. After the splint 201 clamps and extracts the binding belt 116, the binding belt falls directly off to the floor due to gravity, which can avoid the problem of the binding belt 116 falling off onto the y-axis conveying structure 208 when the splint 201 is above the y-axis conveying structure 208.

[0041] like Figure 1 As shown, the cutting push plate 6 can be extended and retracted along the y-axis, and the cutting push plate 6 is connected to the cylinder 601. The cutting push plate 6 pushes the packaging box 115 to the side of the cutting structure 1, and the limit of the bracket 11 makes the packaging box 115 flush with the bracket 11. The cylinder 601 is fixed to the bracket 11 on the side of the tape collecting clamp through the suspension beam 602, and the cutting push plate 6 and the tape collecting clamp 2 are located on the same side of the cutting support unit 3. The cutting push plate 6 pushes the packaging box 115 to be flush with the side of the cutting structure 1, which not only makes the packaging box 115 on the cutting side placed flat and convenient for cutting, but also makes the packaging box 115 and the binding belt 116 separate under the action of friction when pushing the packaging box 115, which is convenient for entrainment.

[0042] Combination Figure 1 The number and position of the grinding wheel 101, the binding belt 116 and the clamping plate 201 correspond one to one, so that the binding belt 116 can be cut and clamped at one time.

[0043] like Figure 1 As shown, the cutting support unit 3 is located between the cutting structure 1 and the tape collecting fixture 2, and can be extended to support the packaging box 115; Figure 5 As shown, the cutting support unit 3 includes a support plate 301 and a telescopic structure with adjustable vertical height connected to the support plate 301, and the support plate 301 is a horizontal plane structure. The telescopic structure of the cutting support unit 3 includes a guide rod 303, a cylinder 304 and a support fixing plate 305, and the guide rod 303 and the cylinder 304 are both fixed on the support fixing plate 305, and the guide rod 303 is connected to the support fixing plate 305. Figure 5 The telescopic structure is only one implementation of the present application to realize the lifting of the support plate 301. In order to facilitate the removal of the binding belt 116, a groove 302 can be opened on the support plate 301 of the cutting support unit 3, and the binding belt 116 is placed in the groove 302 when the packaging box 115 is delivered, so as to facilitate the removal of the binding belt 116.

[0044] like Figure 1 As shown, the stacking support unit 4 includes a support plate 401 and a telescopic structure connected to the support plate 401 with adjustable vertical height, and the height can be adjusted to lift the packaging box 115. Figure 6As shown, the support plate 401 is a horizontal plane structure, and the telescopic structure of the stacking support unit 4 includes a guide rod 403, a cylinder 404 and a support fixing plate 405, the guide rod 403 and the cylinder 404 are both fixed on the support fixing plate 405, and the guide rod 403 is connected to the support fixing plate 405. Figure 6 The telescopic structure is only one implementation method of the present application to realize the telescopic support plate 401.

[0045] like Figure 1 As shown, the conveying unit 9 conveys the packaging box 115 from the cutting support unit 3 to the stacking support unit 4 .

[0046] like Figure 1 As shown, the stacking bracket 7 is located above both sides of the stacking support unit 4, and the stacking bracket 7 can be extended and retracted to support the packaging box 115 that has been lifted up by the stacking support unit 4; Figure 7 As shown, the stacking bracket 7 includes a telescopic rod 702, a transmission rod 704 and a power device 703, and the transmission rod 704 is respectively connected to the power device 703 and the telescopic rod 702 to achieve the telescopic movement of the telescopic rod 702. The number of stacking brackets 7 ensures that at least one is provided on each side, so that the stacking of packaging boxes can be achieved. In order to improve the stability of the packaging boxes on the stacking bracket 7, two stacking brackets 7 are provided on each side of the stacking unit. The stacking bracket 7 can also be provided with a horizontal support plate 701 connected to the telescopic rod 702 to increase the contact area between the stacking bracket 7 and the packaging box 115, thereby further improving the stability.

[0047] like Figure 1 As shown, the limiting assembly 8 is located at the rear of the conveying unit 9 to limit the conveying position of the packaging box 115. Figure 8 As shown, the limiting assembly 8 includes a limiting baffle 801 and a telescopic structure connected to the limiting baffle 801 with adjustable vertical height. The limiting plate 801 is a vertical plane structure, perpendicular to the incoming material direction. By adjusting the telescopic structure and raising the height of the limiting plate 801, the incoming packaging box being transmitted is blocked by the raised limiting plate 801, which not only has a blocking effect, but also the plane structure and orientation design of the limiting plate 801 improve the neatness of the packaging box stacking, making the stacking more stable. Figure 8 As shown, the telescopic structure includes a guide rod 802, a limit fixing plate 803 and a cylinder 804, wherein the guide rod 802 and the cylinder 804 are both fixed on the limit fixing plate 803, and the guide rod 802 is connected to the limit baffle 801. The structural setting of the limit assembly 8 can realize the movement of the limit baffle 801 in the vertical height. Figure 8 The telescopic structure is only one implementation method of the present application to realize the telescopic structure of the limiting plate 801.

[0048] The following will describe the process of removing and stacking the binding straps in combination with the above-mentioned integrated machine for removing and stacking the binding straps of packaging boxes:

[0049] S1. Adjust the height of the support plate 301 and place the packaging box 115 on the support plate 301. The cutting push plate 6 pushes the packaging box 115 to be flush with the bracket 11 on the cutting structure 1 side, which not only makes the packaging box 115 on the cutting structure 1 side flat and convenient for cutting, but also separates the packaging box 115 from the binding belt 116 under the action of friction, which is convenient for entrainment.

[0050] S2, cylinder 106 and cylinder 113 jointly adjust the horizontal position of the grinding wheel 101 in the cutting structure 1 until the grinding wheel 101 contacts the binding belt 116, and the motor 102 drives the grinding wheel 101 to rotate at a high speed, so that the binding belt 116 contacts the grinding wheel 101 and is ground off, completing the cutting; when the grinding wheel 101 is worn and the position of the grinding wheel 101 needs to be fine-tuned, it can be adjusted through the bolt 112.

[0051] S3. Move the tape collecting clamp 2 to the working position where the top 209 of the clamp plate contacts the packaging box 115. Before moving to the working position, the sliding clamp plate 202 and the fixed clamp plate 203 are in the open state and are located on both sides of the binding belt 116; move the sliding clamp plate 202 to the closed state to complete the clamping operation. It should be noted that the order of cutting the belt and clamping the belt is not limited. For tightly bound binding belts, it is suitable to cut the belt first and then clamp the belt. For loosely bound binding belts, it is suitable to clamp the belt first and then cut the belt. After completing the cutting and clamping, the tape collecting clamp 2 returns to the non-working position and removes the binding belt 116.

[0052] S4, adjust the height of the support plate 301 again, so that the height of the cutting support unit 3 is lower than the height of the conveying unit 9, and the packaging box 115 is transferred from the cutting support unit 3 to the conveying unit 9. Before the packaging box 115 is transferred to the stacking position by the conveying unit 9, the height of the blocking plate 801 is raised, which can block the packaging box and make the packaging box stacked neatly. After the packaging box 115 is transferred to the stacking position, the height of the stacking support unit 4 is raised, and the packaging box is transferred from the conveying unit 9 to the stacking support unit 4.

[0053] S5. The stacking support unit 4 lifts the packing box 115 until the packing box 115 reaches the stacking bracket 7, and the stacking bracket 7 is in a retracted state; when the packing box 115 is higher than the stacking bracket 7, the stacking bracket 7 extends out; the stacking support unit 4 is lowered until it is lower than the stacking bracket 7, and the packing box 115 is stacked on the stacking bracket 7, and the stacking bracket 7 supports the packing box 115.

[0054] S6, repeat the above operation, when the stacking support unit 7 lifts the packaging box 115 to the bottom of the stacking bracket 7 again, the stacking bracket 7 retracts, and the packaging box on the stacking bracket 7 falls on the packaging box of the stacking support unit 4, until the stacking support unit 4 lifts the packaging box to the top of the stacking bracket 7, the stacking bracket 7 extends, and when the height of the stacking support unit 4 is lower than the stacking bracket 7, the packaging box is transferred to the stacking bracket 7, and the stacking bracket 7 supports the packaging box above. Repeating the operation can achieve large-scale stable stacking.

[0055] The above-mentioned packaging box binding strap releasing and stacking integrated machine realizes automatic strap cutting and stacking automation and integration through the reasonable settings of strap cutting, strap collection and stacking, with simple and compact structure and low cost; the coordinated operation of the cutting push plate and the strap collection unit makes the strap cutting and strap collection operation simple, reliable and efficient; the strap cutting and strap collection structure is suitable for one-time release under various binding conditions; in addition, the combination of the stacking bracket and the limit assembly ensures the quality and quantity of the stacking.

Claims

1. A packaging box binding belt unstacking integrated machine, characterized in that: It comprises a cutting structure (1), a belt collecting clamp (2), a cutting support unit (3), a stacking support unit (4), a stacking bracket (7), a limiting component (8) and a conveying unit (9); The cutting structure (1) comprises at least one grinding wheel (101) capable of high-speed rotation, and the grinding wheel (101) can move along the x-axis and y-axis directions to cut the binding belt (116); The belt collecting clamp (2) comprises at least one pair of openable and closable clamping plates (201); the contact surfaces of the clamping plates (201) are tightly fitted and not smooth, and can be moved along the x-axis and y-axis directions to clamp and remove the binding belt (116); The cutting support unit (3) is located between the cutting structure (1) and the tape collecting clamp (2), and is capable of being retracted to support the packaging box (115); The stacking support unit (4) is height-adjustable and is used to lift the packaging box (115); The stacking brackets (7) are located above both sides of the stacking support unit (4), and the stacking brackets (7) are capable of being retracted to support the packaging boxes that have been lifted up by the stacking support unit (4); The limiting component (8) is located at the rear of the conveying unit (9) and limits the conveying position of the packaging box (115); The conveying unit (9) conveys the packaging box (115) from the cutting support unit (3) to the stacking support unit (4).

2. The integrated machine for removing and stacking packaging box binding straps according to claim 1 is characterized in that: It also includes a cutting push plate (6) which can be extended and retracted along the y-axis to push the packaging box (115) to be flush with the cutting structure (1). The cutting push plate (6) and the tape collecting clamp (2) are located on the same side of the cutting support unit (3).

3. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The movement of the grinding wheel (101) in the y-axis direction can be finely adjusted.

4. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The clamping plate (201) comprises a fixed clamping plate (202) and a sliding clamping plate (203) that moves on the x-axis, and the number and position of the fixed clamping plate (202) and the sliding clamping plate (203) can be adjusted.

5. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: When the number of the clamping plates (201) is not less than 2 pairs, the distance between adjacent fixed clamping plates (202) is equal to the distance between corresponding adjacent sliding clamping plates (203), thereby achieving closure of multiple pairs of clamping plates (201).

6. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The number and positions of the grinding wheel (101), the binding belt (116) and the clamping plate (201) correspond one to one, so that the binding belt (116) can be cut and clamped at one time.

7. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The contact surface of the clamping plate (201) is a wedging tooth surface.

8. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The clamping plate (201) can also be located below the y-axis conveying structure (208).

9. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The stacking bracket (7) comprises a telescopic rod (702), a transmission rod (704) and a power device (703); the transmission rod (704) is respectively connected to the power device (703) and the telescopic rod (702) to achieve telescopic movement of the telescopic rod (702).

10. The integrated machine for removing and stacking packaging box binding straps according to claim 1, characterized in that: The limiting assembly (8) comprises a limiting baffle (801) and a telescopic structure connected to the limiting baffle (801) and having a vertically adjustable height.

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