Compression-resistant compact packaging machine for refill cellosilk

Abstract

The invention relates to the technical field of fiber packaging, and discloses a refill cellosilk compression-resistant compact packaging machine which comprises a box body, an air pump part is installed in the box body, and two sets of side plates are installed at the upper end of the box body; the special ton bag is arranged between the two sets of side plates and used for bagging cellosilk, and a circle of cavity layer is arranged in the special ton bag; the convergent part is arranged at the upper end of the box body and used for convergent opening of the special ton bag; and the gas conveying part is arranged at the upper end of the box body and is connected with the gas pump part. In the operation process of the packaging machine, the double air pumps work cooperatively to exhaust and blow special ton bags, step-by-step operation is not needed, the packaging time is remarkably shortened, and the efficiency is improved; manual pipeline plugging operation is reduced, the error rate is reduced, and the operation safety is improved; the tightening part is driven through the servo motor, rapid twisting sealing of the bag opening is achieved, the sealing performance is higher, and gas in the special ton bag is pumped away to prevent fiber filaments from loosening when the tightening part is manually fixed.

Description

Technical Field

[0001] The invention relates to the technical field of fiber packaging, in particular to a compact compression-resistant packaging machine for pen core fiber filaments. Background Art

[0002] In the processing of pen refill fiber filaments, winding into rolls can ensure that the fiber bundles maintain uniform tension in the subsequent dipping and curing processes to prevent the fibers from loosening or breaking. The tension is controlled after the limiter wire is wound, and a tight overlap can be formed between the fiber layers, which significantly enhances the mechanical strength of the pen refill. For large-scale production scenarios of fiber filaments, if the rolled fiber filaments need to be transported in a centralized manner, a packaging machine will be used for bagging. The fiber filaments are packed into moisture-proof ton bags to prevent the fiber filaments from contacting the external environment and ensure that the fibers are not contaminated during transportation.

[0003] However, after the fiber is packed into moisture-proof bulk bags, the following problems still exist:

[0004] 1. The fiber filaments are packed into moisture-proof ton bags. During transportation, there is friction between the moisture-proof ton bags and the fiber filaments, which makes the outer layer of the fiber filaments easy to fluff. It can be protected by covering the outermost layer of fibers with a layer of plastic film. Although it can achieve the protective effect, it further increases the complexity of packaging.

[0005] Second, the packaged fiber filaments are easily squeezed and deformed during transportation, especially the external pressure will be concentrated on the unit area of ​​the contact area. The fiber cannot effectively disperse the pressure, resulting in the amplification of local deformation and affecting the quality of the fiber filaments. Summary of the invention

[0006] The object of the present invention is to provide a compact compression-resistant packaging machine for pen core fiber filaments to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a compact compression-resistant packaging machine for pen refill fiber filaments, comprising:

[0008] The box body has an air pump unit installed inside and two sets of side panels installed on the upper end;

[0009] A special ton bag, arranged between two sets of side plates, for bagging the fiber filaments, wherein the special ton bag has a circle of cavity layer inside;

[0010] The closing part is arranged at the upper end of the box body and is used to close the mouth of the special ton bag;

[0011] The gas delivery part is arranged at the upper end of the box body and connected with the air pump part, and is used for inflating the cavity layer of the special ton bag and for sucking air inside the special ton bag for bagging.

[0012] Furthermore, a sliding end is slidably provided between the two groups of side plates, the converging portion is installed inside the sliding end, and the gas conveying portion is installed on the inner side of the sliding end.

[0013] Furthermore, two corners at the lower end of the sliding end are fixed with sliding shafts extending inwardly, and the two groups of sliding shafts slide on the inner sides of the two groups of side plates respectively.

[0014] Furthermore, a chamber is provided on the outward side of the sliding end, and the converging portion includes a gear ring, a plurality of clamping plates, an internal gear and a servo motor;

[0015] The gear ring and the inner gear are both rotatably installed in the chamber, the gear ring is meshed with the inner gear, the interior of the gear ring is hollow, and a plurality of clamping sheets are circumferentially fixed on the outward side of the gear ring, and the plurality of clamping sheets are squeezed with the inner ring wall of the gear ring to clamp the opening end of the special ton bag;

[0016] A cover plate for closing the chamber is fixed on the outer side of the sliding end, the servo motor is fixed on the outer side of the cover plate, and the output end of the servo motor is fixed to the internal gear.

[0017] Furthermore, the clamping sheet is an elastic metal sheet, and the middle part thereof protrudes outwards to be pressed against the inner wall of the gear ring.

[0018] Furthermore, the gas delivery part includes two groups of inner frames fixed on the inner side of the sliding end, and inner sliding shafts are slid on the two groups of inner frames. The two groups of inner sliding shafts are used to clamp the special ton bags. The outer ends of the two groups of inner sliding shafts are connected with connecting pipe bodies, and the connecting pipe bodies are connected to the air pump part. Connecting ends are opened on the outer walls of the two groups of inner sliding shafts, and the two connecting ends are respectively used to inflate and inhale the special ton bags.

[0019] Furthermore, the air pump unit includes two air pumps, one of which is used for inhaling air and the other is used for blowing air, and the two connecting tubes are respectively connected to the two air pumps.

[0020] Furthermore, the special ton bag is fixed with a connecting pipe 1 and a connecting pipe 2 on the outside, and both the connecting pipe 1 and the connecting pipe 2 have a one-way valve inside, wherein the connecting pipe 1 is used for air intake, and the connecting pipe 2 is used for air outlet;

[0021] The connecting pipe 1 is connected to the interior of the cavity layer, and the connecting pipe 2 is connected to the interior of the special ton bag.

[0022] Furthermore, a plurality of circumferentially distributed diaphragms are fixed inside the cavity layer, and the diaphragms are connected to the cavities formed by adjacent diaphragms. The diaphragms are elastic, and the special ton bag is also elastic.

[0023] Furthermore, a polygonal limiting sleeve is fixed between the two groups of side plates, and a plurality of groups of extrusion parts for supporting the special ton bag are distributed circumferentially on the inner wall of the limiting sleeve, and the extrusion part includes a sleeve body, a support spring and a sliding body;

[0024] The sleeve is fixed on the inner wall of the limiting sleeve, the supporting spring is clamped inside the sleeve, the sliding body is slidably arranged in the sleeve and abuts against the supporting spring, the inward side of the sliding body abuts against the special ton bag, the two groups of inner sliding shafts are respectively engaged with the corresponding sliding bodies, and the inner sliding shafts can slide along the axial direction of the sliding body.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0026] 1. During operation, the packaging machine realizes the coordinated work of dual air pumps to achieve air extraction and air blowing of special ton bags, without the need for step-by-step operation, significantly shortening the packaging time and improving efficiency; reducing the operation of manual plugging and unplugging of pipelines, reducing the error rate and improving operation safety; the servo motor drives the closing part to achieve rapid twisting and sealing of the bag mouth, which has stronger sealing performance, and extracts the gas inside the special ton bag to prevent the fiber filaments from loosening when the closing is manually fixed.

[0027] 2. The cavity layer directly isolates the special ton bag from the fiber filaments, reducing the fuzzing problem caused by friction during transportation. No additional plastic film is required, which simplifies the packaging process and reduces material costs. The cavity layer has a built-in elastic diaphragm to evenly disperse the pressure, evenly dispersing the concentrated pressure to the inner wall of the entire cavity layer to avoid the local deformation and amplification of the fiber filaments.

[0028] 3. The internal structure of the fiber filaments is compacted under negative pressure, reducing the risk of local extrusion deformation caused by looseness during transportation, while improving the overall compressive strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the exploded structure of the box body and one side panel of the present invention facing outwards;

[0032] Figure 3 It is a schematic diagram of the structure of the present invention in which a portion of the sliding end is pulled outward;

[0033] Figure 4 It is a schematic diagram of the structure of the convergence part in the sliding end of the present invention;

[0034] Figure 5 The present invention Figure 4 A is a schematic diagram of the partially enlarged structure of the middle part;

[0035] Figure 6 It is a schematic diagram of the structure of the limiting sleeve and the extrusion part of the present invention;

[0036] Figure 7 It is a schematic diagram of the installation position structure of the gas delivery part of the present invention;

[0037] Figure 8 It is a schematic diagram of the position structure of the extrusion part and the gas delivery part of the present invention;

[0038] Fig. 9 It is a schematic diagram of the structure of the special ton bag of the present invention.

[0039] In the figure: 1. box body; 2. air pump part; 3. side plate; 4. sliding end; 41. sliding shaft; 42. chamber; 5. converging part; 51. gear ring; 52. clamping plate; 53. internal gear; 54. servo motor; 55. cover plate; 6. limit sleeve; 7. extrusion part; 71. sleeve body; 72. support spring; 73. sliding body; 8. special bulk bag; 81. cavity layer; 82. connecting pipe one; 83. connecting pipe two; 84. diaphragm; 9. gas delivery part; 91. inner frame; 92. inner sliding shaft; 93. connecting end; 94. connecting pipe body. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 9 The present invention provides a technical solution: a compact compression-resistant packaging machine for pen core fiber filaments, comprising:

[0042] The box body 1 has an air pump part 2 installed inside and two sets of side panels 3 installed on the upper end thereof;

[0043] A special bulk bag 8 is arranged between two sets of side plates 3 and is used to bag the fiber filaments. The special bulk bag 8 has a circle of cavity layer 81 inside;

[0044] The closing part 5 is arranged at the upper end of the box body 1 and is used to close the special bulk bag 8;

[0045] The gas delivery unit 9 is disposed at the upper end of the box body 1 and connected to the air pump unit 2 for inflating the cavity layer 81 of the special ton bag 8 and for sucking air inside the special ton bag 8 for bagging.

[0046] Specifically, the box body 1 is the main body of the equipment, and the internal air pump part 2 is divided into two independent air pumps, which are respectively responsible for inflating the cavity layer 81 of the special ton bag 8 and extracting air from the bag to achieve dynamic control of the gas.

[0047] A sliding end 4 is slidably disposed between the two sets of side plates 3 , the converging portion 5 is installed inside the sliding end 4 , and the gas conveying portion 9 is installed on the inner side of the sliding end 4 .

[0048] Specifically, the sliding end 4 can slide inward and outward, so as to facilitate the installation and fixation of the special big bag 8, and the gas conveying part 9 transmits the gas into the special big bag 8 or extracts the gas.

[0049] Sliding shafts 41 extending inwardly are fixed to two corners at the lower end of the sliding end 4 , and two groups of sliding shafts 41 slide on the inner sides of the two groups of side plates 3 respectively.

[0050] The sliding end 4 is provided with a chamber 42 on the outward side, and the converging portion 5 includes a gear ring 51, a plurality of clamping pieces 52, an internal gear 53 and a servo motor 54;

[0051] The gear ring 51 and the internal gear 53 are both rotatably mounted in the chamber 42. The gear ring 51 meshes with the internal gear 53. The interior of the gear ring 51 is hollow and penetrates through. A plurality of clamping pieces 52 are circumferentially fixed on the outward side of the gear ring 51. The plurality of clamping pieces 52 are pressed against the inner wall of the gear ring 51 to clamp the open end of the special ton bag 8.

[0052] A cover plate 55 for closing the chamber 42 is fixed to the outside of the sliding end 4 . The servo motor 54 is fixed to the outside of the cover plate 55 , and the output end of the servo motor 54 is fixed to the inner gear 53 .

[0053] The clamping sheet 52 is an elastic metal sheet, and the middle portion thereof protrudes outwards to be pressed against the inner wall of the gear ring 51 .

[0054] Specifically, the clamping piece 52 made of elastic metal material rotates by rotating the gear ring 51, clamps the opening of the special ton bag 8 and rotates to close the opening, thereby sealing the space inside the special ton bag 8. The servo motor 54 drives the internal gear 53 to rotate, thereby adjusting the tightness of the closing of the special ton bag 8 to ensure that the special ton bag 8 can be sealed.

[0055] The gas conveying part 9 includes two groups of inner frames 91 fixed on the inner side of the sliding end 4, and inner sliding shafts 92 are slidably arranged on the two groups of inner frames 91. The two groups of inner sliding shafts 92 are used to clamp the special ton bag 8. The outer ends of the two groups of inner sliding shafts 92 are connected with connecting tube bodies 94, and the connecting tube bodies 94 are connected to the air pump part 2. Connecting ends 93 are opened on the outer walls of the two groups of inner sliding shafts 92, and the two connecting ends 93 are respectively used to inflate and inhale the special ton bag 8.

[0056] Specifically, the inner sliding shaft 92 can move axially and radially along the special ton bag 8, and when the diameter of the special ton bag 8 changes, it is ensured to maintain the clamping state. At the same time, the special ton bag 8 needs to be clamped in the extrusion part 7 after installation, so the special ton bag 8 needs to slide into the extrusion part 7, and the inner sliding shaft 92 can also slide to ensure that the two connecting ends 93 are used to inflate and suck air for the special ton bag 8 respectively.

[0057] The air pump unit 2 includes two air pumps, one of which is used for suction and the other for blowing. The two connecting tubes 94 are respectively connected to the two air pumps.

[0058] Specifically, the inner sliding shaft 92 is connected to the connecting tube body 94, and the inner sliding shaft 92 is buckled with the extrusion part 7, and pushes the sliding body 73 to be extruded outward when inflated to form a support. When inhaling, the fiber filaments in the special ton bag 8 are squeezed to improve the compactness.

[0059] A connecting pipe 1 82 and a connecting pipe 2 83 are fixed to the outside of the special ton bag 8. Both the connecting pipe 1 82 and the connecting pipe 2 83 have a one-way valve inside, wherein the connecting pipe 1 82 is used for air intake, and the connecting pipe 2 83 is used for air outlet;

[0060] The connecting pipe 1 82 is connected to the interior of the cavity layer 81 , and the connecting pipe 2 83 is connected to the interior of the special ton bag 8 .

[0061] Specifically, a circle of cavity layer 81 inside the special ton bag 8 expands after being inflated to form a buffer layer to reduce transportation friction; an elastic diaphragm 84 is arranged inside to ensure uniform inflation and maintain structural stability. Connecting pipe 1 82 and connecting pipe 2 83 respectively connect the cavity layer 81 and the space inside the bag, and the airflow direction is controlled by a one-way valve to prevent gas backflow.

[0062] A plurality of circumferentially distributed diaphragms 84 are fixed inside the cavity layer 81 , and the diaphragms 84 are connected to the cavities formed by adjacent diaphragms 84 . The diaphragms 84 are elastic, and the special ton bag 8 is also elastic.

[0063] Specifically, the diaphragm 84 is used to support the inner walls on both sides of the cavity layer 81 to ensure that the axes of the inner walls on both sides of the cavity layer 81 are relatively coincident, so that the fiber filaments are covered by the air layer to achieve a shock-absorbing effect.

[0064] A polygonal limiting sleeve 6 is also fixed between the two sets of side plates 3. A plurality of extrusion parts 7 for supporting the special ton bag 8 are distributed circumferentially on the inner wall of the limiting sleeve 6. The extrusion part 7 includes a sleeve body 71, a support spring 72 and a sliding body 73.

[0065] The sleeve 71 is fixed to the inner wall of the limiting sleeve 6, the support spring 72 is clamped inside the sleeve 71, the sliding body 73 is slidably set in the sleeve 71 and abuts against the support spring 72, the inward side of the sliding body 73 abuts against the special ton bag 8, and the two groups of inner sliding shafts 92 are respectively engaged with the corresponding sliding bodies 73, and the inner sliding shafts 92 can slide axially along the sliding body 73.

[0066] Specifically, the extrusion part 7 supports the special ton bag 8 filled with fiber filaments, so that the opening end of the special ton bag 8 can be rotated to achieve the effect of closing the opening, and the part of the special ton bag 8 filled with fiber filaments can be sealed, so that the inner wall of the special ton bag 8 fits with the fiber filaments to avoid friction.

[0067] Working principle of the present invention:

[0068] First, the sliding end 4 is manually pulled outward, and the special big bag 8 is manually placed between the two sets of inner sliding shafts 92, and the opening of the special big bag 8 is opened and stretched into the gear ring 51, and the opening edge of the special big bag 8 is clamped by the clamping piece 52, and then the connecting pipe 1 82 and the connecting pipe 2 83 of the special big bag 8 are respectively buckled into the connecting ends 93 on both sides;

[0069] Secondly, the sliding end 4 is manually pushed inwards to make the special big bag 8 located between the multiple groups of extrusion parts 7, and then the fiber filaments are manually pushed outwards from the outside of the gear ring 51 and sleeved inside the special big bag 8. Since the fiber filaments have a certain diameter, the special big bag 8 is expanded and extruded with the multiple groups of extrusion parts 7 on the outside to clamp the fiber filaments and the special big bag 8;

[0070] Afterwards, the servo motor 54 is manually controlled to rotate the gear ring 51, so that the opening of the special ton bag 8 rotates, while other parts will not rotate due to being restricted, so that the opening of the special ton bag 8 is tightened. Then, the air pump part 2 is manually controlled to suck air into the interior of the special ton bag 8 and blow it into the interior of the cavity layer 81. Since the extrusion part 7 can be retracted, the special ton bag 8 can be expanded. Then, the sliding end 4 is manually slid out, and the special ton bag 8 is removed. The opening is further manually reinforced to complete the bagging.

[0071] It should be noted that the connection pipe 1 82 and the connection pipe 2 83 of the above-mentioned special ton bag 8 are respectively connected to the connection ends 93 on both sides, so that the gas of the air pump part 2 enters the cavity layer 81 from the connection pipe 1 82, and the internal gas of the special ton bag 8 is extracted from the connection pipe 2 83, so that the part of the special ton bag 8 that is bagged squeezes the fiber filaments inward, and the cavity layer 81 on the outside expands, so that the overall diameter of the special ton bag 8 increases, but the increase is limited. The packaging machine is used to complete the bagged fiber filaments, so that the fiber filaments and the inner wall of the special ton bag 8 are precisely fitted, and friction is avoided as much as possible to cause fluffing. At the same time, when squeezing the outside of the special ton bag 8, the gas inside the cavity layer 81 is subjected to pressure, and the concentrated pressure is dispersed to each inner wall of the cavity layer 81, dispersing the pressure on the fiber filaments. It should also be noted that the function of the diaphragm 84 is to pull the inner walls on both sides of the cavity layer 81 so that the axes of the inner walls on both sides of the cavity layer 81 coincide with each other, that is, a circle of gas wraps the fiber filaments to achieve the effect of shock absorption.

[0072] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0073] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compact compression-resistant packaging machine for pen refill fiber filaments, characterized in that: include: The box body (1) has an air pump unit (2) installed inside and two sets of side panels (3) installed on the upper end; A special ton bag (8) is arranged between two sets of side plates (3) and is used to bag the fiber filaments. The special ton bag (8) has a circle of cavity layer (81) inside. A closing portion (5) is arranged at the upper end of the box body (1) and is used to close the opening of the special ton bag (8); The gas delivery unit (9) is arranged at the upper end of the box body (1) and is connected to the air pump unit (2) and is used to inflate the cavity layer (81) of the special ton bag (8) and to absorb air from the interior of the special ton bag (8) for bagging.

2. The compact compression-resistant packaging machine for pen refill fibers according to claim 1, characterized in that: A sliding end (4) slides between the two groups of side plates (3), the converging portion (5) is installed inside the sliding end (4), and the gas conveying portion (9) is installed on the inner side of the sliding end (4).

3. The compact compression-resistant packaging machine for pen refill fibers according to claim 2, characterized in that: Sliding shafts (41) extending inwardly are fixed to two corners at the lower end of the sliding end (4), and two groups of the sliding shafts (41) slide on the inner sides of the two groups of side plates (3) respectively.

4. The compact compression-resistant packaging machine for pen refill fibers according to claim 2, characterized in that: The sliding end (4) is provided with a chamber (42) on the outward side, and the converging portion (5) comprises a gear ring (51), a plurality of clamping plates (52), an internal gear (53) and a servo motor (54); The gear ring (51) and the internal gear (53) are both rotatably mounted in the chamber (42), the gear ring (51) meshes with the internal gear (53), the interior of the gear ring (51) is hollow, a plurality of clamping pieces (52) are circumferentially fixed on the outward side of the gear ring (51), and the plurality of clamping pieces (52) are pressed against the inner wall of the gear ring (51) to clamp the open end of the special ton bag (8); A cover plate (55) for closing the chamber (42) is fixed to the outside of the sliding end (4); the servo motor (54) is fixed to the outside of the cover plate (55), and its output end is fixed to the internal gear (53).

5. The compact compression-resistant packaging machine for pen refill fibers according to claim 4, characterized in that: The clamping sheet (52) is an elastic metal sheet, the middle portion of which protrudes outwards to be pressed against the inner wall of the gear ring (51).

6. The compact compression-resistant packaging machine for pen refill fibers according to claim 2, characterized in that: The gas conveying part (9) comprises two groups of inner frames (91) fixed on the inner side of the sliding end (4), and inner sliding shafts (92) are slidably arranged on the two groups of inner frames (91). The two groups of inner sliding shafts (92) are used to clamp the special ton bag (8). The outer ends of the two groups of inner sliding shafts (92) are connected to connecting tube bodies (94), and the connecting tube bodies (94) are connected to the air pump part (2). The outer walls of the two groups of inner sliding shafts (92) are provided with connecting ends (93), and the two connecting ends (93) are used to inflate and inhale the special ton bag (8), respectively.

7. The compact compression-resistant packaging machine for pen refill fibers according to claim 6, characterized in that: The air pump part (2) comprises two air pumps, one of which is used for inhaling air and the other for blowing air, and the two connecting tube bodies (94) are respectively connected to the two air pumps.

8. The compact pressure-resistant packaging machine for pen refill fibers according to claim 6, characterized in that: The special ton bag (8) is externally fixed with a connecting pipe 1 (82) and a connecting pipe 2 (83), and both the connecting pipe 1 (82) and the connecting pipe 2 (83) have a one-way valve inside, wherein the connecting pipe 1 (82) is used for air intake, and the connecting pipe 2 (83) is used for air outlet; The connecting pipe 1 (82) is connected to the interior of the cavity layer (81), and the connecting pipe 2 (83) is connected to the interior of the special ton bag (8).

9. The compact compression-resistant packaging machine for pen refill fibers according to claim 8, characterized in that: A plurality of circumferentially distributed diaphragms (84) are fixed inside the cavity layer (81); the diaphragms (84) are connected to cavities formed by adjacent diaphragms (84); the diaphragms (84) are elastic, and the special ton bag (8) is also elastic.

10. The compact pressure-resistant packaging machine for pen refill fibers according to claim 6, characterized in that: A polygonal limiting sleeve (6) is also fixed between the two groups of side plates (3), and a plurality of groups of extrusion parts (7) for supporting the special ton bag (8) are distributed circumferentially on the inner wall of the limiting sleeve (6), and the extrusion part (7) comprises a sleeve body (71), a support spring (72) and a sliding body (73); The sleeve (71) is fixed to the inner wall of the limiting sleeve (6), the support spring (72) is clamped inside the sleeve (71), the sliding body (73) is slidably arranged in the sleeve (71) and abuts against the support spring (72), the inner side of the sliding body (73) abuts against the special ton bag (8), the two groups of inner sliding shafts (92) are respectively engaged with the corresponding sliding bodies (73), and the inner sliding shafts (92) can slide axially along the sliding body (73).

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