Calendering device for production of inkjet heat transfer printing body paper

Abstract

The utility model belongs to the technical field of papermaking, and particularly relates to a calendaring device for producing inkjet heat transfer printing body paper, which comprises a rack, and an upper calendaring roller and a heating roller are arranged on the rack. The upper calendering roller is rotationally arranged on the rack; the heating roller is arranged below the upper calendering roller, the two ends of the heating roller are communicated with a liquid inlet pipe and a liquid outlet pipe, and an adjusting assembly is arranged in the heating roller and used for adjusting the distribution area of hot liquid in the heating roller. According to the utility model, the area range of the hot liquid entering the heating roller from the liquid inlet pipe can be adjusted through the adjusting assembly according to the width of a paper web to be calendered, so that the hot liquid can be heated in a targeted manner, and the waste of heat is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking, and particularly relates to a calendering device for producing inkjet thermal transfer base paper. Background Art

[0002] Inkjet thermal transfer base paper is a special paper used in the manufacture of thermal transfer paper. It has the characteristics of smoothness and uniform thermal expansion rate. It is an important carrier of images and texts in the thermal transfer process. Inkjet thermal transfer base paper is mainly used in the manufacture of thermal transfer paper, and thermal transfer paper is a special paper that prints various images and texts on paper through special thermal transfer ink, and then transfers these images and texts to the substrate through the corresponding temperature and pressure. This technology is widely used in the thermal transfer of patterns on many items such as clothing, building materials and furniture, porcelain, outdoor advertising, etc.

[0003] The calendering treatment of inkjet thermal transfer base paper is an important part of the thermal transfer process. It is of great significance to improve the glossiness of the paper surface and improve the surface performance of the paper. After the surface sizing, coating and drying of the inkjet thermal transfer base paper, it needs to be calendered by a calender. In the calendering process, the cooperation between the soft roller and the electromagnetic heating roller plays a key role. The soft roller usually has a certain elasticity and softness, and can better adapt to the tiny bumps on the surface of the paper, while the electromagnetic heating roller generates heat through the principle of electromagnetic induction to heat the paper. When the paper passes through the calendering channel, the soft roller and the electromagnetic heating roller act on the paper at the same time, and the surface of the paper becomes smoother and brighter through heating and extrusion, thereby improving the thermal transfer effect and making the transferred pattern color more vivid and delicate.

[0004] In existing calenders, the entire heating roller is usually in a heated state. Since the calendering equipment can be used to calender papers of different paper widths, when the paper width is small, heating the entire heating roller will generate more heat waste. Utility Model Content

[0005] The purpose of the utility model is to provide a calendering device for producing inkjet thermal transfer base paper in order to solve the above-mentioned technical problems, thereby achieving the effect of reducing heat waste.

[0006] In view of this, the utility model provides a calendering device for producing inkjet thermal transfer base paper, comprising a frame, on which are arranged:

[0007] An upper pressing roller, which is rotatably arranged on a frame;

[0008] The heating roller is arranged below the upper pressure roller, and the two ends of the heating roller are connected with a liquid inlet pipe and a liquid outlet pipe. An adjusting component is arranged inside the heating roller for adjusting the distribution area of ​​the hot liquid in the heating roller.

[0009] In this technical solution, the area where the hot liquid is located after entering the heating roller from the liquid inlet pipe can be adjusted by adjusting the component according to the width of the paper web to be calendered, so as to achieve targeted heating and reduce heat waste.

[0010] Furthermore, the heating roller includes an intermediate shaft and a sleeve coaxially fixedly arranged outside the intermediate shaft, and the adjustment component is arranged in a cavity between the intermediate shaft and the sleeve.

[0011] Furthermore, the adjustment component includes:

[0012] Sliding sleeves, wherein two sliding sleeves are provided and arranged opposite to each other, and the sliding sleeve cross-section is T-shaped, including a cylindrical section and a disc section, and the cylindrical section and the disc section are provided with communicating sliding holes, and the sliding holes cooperate with the intermediate shaft so that the sliding sleeve is slidably provided on the intermediate shaft, and the outer periphery of the disc section is in sealing and sliding contact with the inner wall of the sleeve, and the disc sections of the two sliding sleeves are respectively provided with a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole is connected to the liquid inlet pipe, and the liquid outlet hole is connected to the liquid outlet pipe, and the inner wall of the sleeve, the two disc sections and the outer wall of the intermediate shaft form a receiving chamber for receiving hot liquid;

[0013] The driving assembly is used to drive the sliding sleeve to slide along the length direction of the intermediate shaft to adjust the range of the accommodating cavity along the length direction of the heating roller.

[0014] In the technical solution, the driving assembly drives the sliding sleeve to slide, so that the range of the accommodating cavity along the length direction of the heating roller can be matched with the width of the paper web to be calendered.

[0015] Furthermore, the driving component comprises:

[0016] An adjusting bolt, wherein the adjusting bolt passes through the end of the sleeve and is threadedly connected to the sleeve, one end of the adjusting bolt extends into the sleeve and is circumferentially rotatably and axially fixedly connected to the end of the disc segment of the sliding sleeve, and the other end of the adjusting bolt is located outside the sleeve;

[0017] A nut is fixedly arranged at the outer end of the sleeve and is threadedly connected with the adjusting bolt.

[0018] In this technical solution, rotating the adjusting bolt causes the bolt to move along its own length direction, driving the sleeve to slide along the outside of the intermediate shaft, thereby adjusting the range of the accommodating cavity along the length direction of the heating roller. At the same time, the nut can increase the contact length of the threaded section, thereby stabilizing the position of the adjusting bolt.

[0019] Furthermore, a tube buckle is provided at the end of the disc segment, and the tube buckle is used to fix the positional relationship between the liquid inlet pipe, the liquid outlet pipe and the disc segment.

[0020] Furthermore, a clearance groove is provided on the intermediate shaft, and the clearance groove is used to provide a clearance space for the movement of the liquid inlet pipe and the liquid outlet pipe.

[0021] Furthermore, a blocking plate is provided in the accommodating chamber near one end of the liquid outlet pipe, and the blocking plate is used to prevent the hot liquid from flowing from the accommodating chamber to the liquid outlet pipe, thereby prolonging the time the hot liquid stays in the accommodating chamber.

[0022] In the present technical solution, a blocking plate is provided to prevent the hot liquid from flowing from the containing chamber to the liquid outlet pipe, thereby increasing the heat exchange time between the hot liquid and the sleeve and improving the thermal energy utilization rate.

[0023] Furthermore, a change component is also provided in the accommodating chamber, and the change component is used to simultaneously adjust the blocking effect of the blocking plate on the hot liquid flowing from the accommodating chamber to the liquid outlet pipe when the accommodating chamber changes along the length direction of the heating roller.

[0024] Furthermore, the change component includes:

[0025] A first rotating seat, wherein the first rotating seat is fixedly arranged on the inner wall of the sleeve, and one end of the blocking plate is rotatably connected to the first rotating seat;

[0026] A second rotating seat, the second rotating seat is fixedly arranged on the outer wall of the cylindrical section of the sliding sleeve;

[0027] A connecting rod and a sliding groove are provided on the blocking plate. One end of the connecting rod is rotatably connected to the second rotating seat, and the other end is rotatably connected to an end of the blocking plate away from the first rotating seat and is slidably arranged in the sliding groove.

[0028] In the present technical solution, when the two sleeves approach each other, that is, the range of the accommodating chamber along the length direction of the heating roller becomes smaller, the volume of the accommodating chamber becomes smaller, and the residence time of the hot liquid in the accommodating chamber becomes shorter. Therefore, when the two sleeves approach each other, that is, the sleeve close to the liquid outlet pipe end slides toward the liquid inlet pipe end, it will move with the connecting rod, causing the connecting rod to rotate and the blocking plate to rotate, causing the blocking plate to gradually tilt toward the liquid inlet pipe end, and the blocking effect on the hot liquid will be better. Conversely, when the volume of the accommodating chamber increases, the blocking plate gradually tilts toward the liquid outlet pipe end, and the blocking effect on the hot liquid is reduced.

[0029] Furthermore, the method for using the calendering device comprises the following steps:

[0030] S1: Adjustment: Rotate the adjusting bolt to move the sleeve to a suitable position to match the paper width;

[0031] S2: Liquid inlet, start the liquid pump to allow the hot liquid to enter the containing chamber from the liquid inlet pipe, and then be discharged from the liquid outlet pipe after heat exchange with the sleeve.

[0032] S3: Calendering, the paper is transferred to between the upper calendering roller and the heating roller for calendering.

[0033] The beneficial effects of the utility model are:

[0034] 1. The area where the hot liquid is located after entering the heating roller from the liquid inlet pipe can be adjusted by adjusting the component according to the width of the paper to be calendered, which can provide targeted heating and reduce heat waste. The driving component drives the sliding sleeve to slide, so that the range of the accommodating cavity along the length direction of the heating roller can be matched with the width of the paper to be calendered.

[0035] 2. Rotate the adjusting bolt to move along its own length direction, driving the sleeve to slide along the outside of the intermediate shaft, thereby adjusting the range of the accommodating cavity along the length direction of the heating roller. At the same time, the nut can increase the contact length of the threaded section, thereby stabilizing the position of the adjusting bolt.

[0036] 3. A blocking plate is provided to prevent the hot liquid from flowing from the containing chamber to the liquid outlet pipe, which can increase the heat exchange time between the hot liquid and the sleeve and improve the utilization rate of thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional diagram of the utility model;

[0038] Figure 2 is a cross-sectional view of a heating roller;

[0039] Figure 3 It is a three-dimensional diagram of the sliding sleeve;

[0040] Figure 4 yes Figure 2 A partial enlarged view of the middle A;

[0041] Figure 5 yes Figure 4 The state diagram after the sliding sleeve moves toward the liquid inlet pipe;

[0042] Figure 6 yes Figure 4 The state diagram after the sliding sleeve moves to the liquid outlet pipe;

[0043] The symbols in the figure are:

[0044] 1. Frame; 2. Upper pressure stick; 3. Heating roller; 4. Liquid inlet pipe; 5. Liquid outlet pipe; 6. Intermediate shaft; 7. Sleeve; 8. Sliding sleeve; 9. Cylindrical section; 10. Disc section; 11. Sliding hole; 12. Liquid inlet hole; 13. Liquid outlet hole; 14. Accommodating chamber; 15. Adjusting bolt; 16. Nut; 17. Pipe buckle; 18. Give way groove; 19. Blocking plate; 20. First swivel seat; 21. Second swivel seat; 22. Connecting rod; 23. Sliding groove. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0046] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0048] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0049] It should be noted that, in the present application, the terms "comprise", "include" or any other variant 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. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0050] Embodiment 1

[0051] like Figure 1-4 As shown, a calendering device for producing inkjet thermal transfer base paper includes a frame 1, on which an upper calendering roller 2 and a heating roller 3 are arranged. The upper calendering roller 2 is rotatably arranged on the frame 1; the heating roller 3 is arranged below the upper calendering roller 2, and both ends of the heating roller 3 are connected with a liquid inlet pipe 4 and a liquid outlet pipe 5, and an adjustment component is arranged in the heating roller 3 for adjusting the distribution area of ​​the hot liquid in the heating roller 3.

[0052] The area where the hot liquid is located after entering the heating roller 3 from the liquid inlet pipe 4 can be adjusted by adjusting the adjustment component according to the width of the paper web to be calendered, so as to achieve targeted heating and reduce heat waste.

[0053] The heating roller 3 includes an intermediate shaft 6 and a sleeve 7 coaxially fixedly arranged outside the intermediate shaft 6 , and the adjustment component is arranged in a cavity between the intermediate shaft 6 and the sleeve 7 .

[0054] The adjustment assembly includes a sleeve 8 and a drive assembly. There are two sleeves 8, which are arranged opposite to each other. The sleeves 8 have a T-shaped cross section and include a cylindrical section 9 and a disc section 10. The cylindrical section 9 and the disc section 10 are provided with a communicating sliding hole 11. The sliding hole 11 cooperates with the intermediate shaft 6 so that the sleeve 8 is slidably arranged on the intermediate shaft 6. The outer periphery of the disc section 10 is in sealing and sliding contact with the inner wall of the sleeve 7. The disc sections 10 of the two sleeves 8 are respectively provided with a liquid inlet hole 12 and a liquid outlet hole 13. The liquid inlet hole 12 is connected to the liquid inlet pipe 4, and the liquid outlet hole 13 is connected to the liquid outlet pipe 5. The inner wall of the sleeve 7, the two disc sections 10 and the outer wall of the intermediate shaft 6 form a receiving chamber 14 for receiving hot liquid. The drive assembly is used to drive the sleeve 8 to slide along the length direction of the intermediate shaft 6 to adjust the range of the receiving chamber 14 along the length direction of the heating roller 3.

[0055] By driving the sliding sleeve 8 to slide through the driving assembly, the accommodating cavity 14 can be extended along the length direction of the heating roller 3 to match the width of the paper web to be calendered.

[0056] The driving assembly includes an adjusting bolt 15 and a nut 16. The adjusting bolt 15 passes through the end of the sleeve 7 and is threadedly connected to the sleeve 7. One end of the adjusting bolt 15 extends into the sleeve 7 and is circumferentially and axially fixedly connected to the end of the disc segment 10 of the sliding sleeve 8, and the other end of the adjusting bolt 15 is located outside the sleeve 7; the nut 16 is fixedly arranged at the outer end of the sleeve 7 and is threadedly connected to the adjusting bolt 15.

[0057] Rotating the adjusting bolt 15 makes the bolt move along its own length direction, driving the sleeve 8 to slide along the outside of the intermediate shaft 6, thereby adjusting the range of the accommodating cavity 14 along the length direction of the heating roller 3. At the same time, the nut 16 can increase the contact length of the threaded section, thereby stabilizing the position of the adjusting bolt 15.

[0058] Embodiment 2

[0059] like Figure 3-4 As shown, the end of the disc segment 10 is provided with a tube buckle 17, which is used to fix the positional relationship between the liquid inlet pipe 4 and the liquid outlet pipe 5 and the disc segment 10. The intermediate shaft 6 is provided with a clearance groove 18, which is used to provide clearance space for the movement of the liquid inlet pipe 4 and the liquid outlet pipe 5.

[0060] Embodiment 3

[0061] like Figure 4-6 As shown, a blocking plate 19 is provided in the accommodating chamber 14 near one end of the liquid outlet pipe 5, and the blocking plate 19 is used to prevent the hot liquid from flowing from the accommodating chamber 14 to the liquid outlet pipe 5, thereby prolonging the time the hot liquid stays in the accommodating chamber 14. The blocking plate 19 is provided to prevent the hot liquid from flowing from the accommodating chamber 14 to the liquid outlet pipe 5, thereby prolonging the heat exchange time between the hot liquid and the sleeve 7 and improving the utilization rate of heat energy.

[0062] A changing component is also provided in the accommodating chamber 14 , and the changing component is used to simultaneously adjust the blocking effect of the blocking plate 19 on the hot liquid flowing from the accommodating chamber 14 to the liquid outlet pipe 5 when the accommodating chamber 14 changes along the length direction of the heating roller 3 .

[0063] The changing assembly includes a first rotating seat 20, a second rotating seat 21 and a connecting rod 22. The first rotating seat 20 is fixedly arranged on the inner wall of the sleeve 7, and one end of the blocking plate 19 is rotatably connected to the first rotating seat 20; the second rotating seat 21 is fixedly arranged on the outer wall of the cylindrical section 9 of the sliding sleeve 8; a sliding groove 23 is provided on the blocking plate 19, one end of the connecting rod 22 is rotatably connected to the second rotating seat 21, and the other end is rotatably connected to the end of the blocking plate 19 away from the first rotating seat 20 and is slidably arranged in the sliding groove 23.

[0064] When the two sleeves 8 are close to each other, that is, the range of the accommodating chamber 14 along the length direction of the heating roller 3 becomes smaller, the volume of the accommodating chamber 14 becomes smaller, and the time for the hot liquid to stay in the accommodating chamber 14 becomes shorter. Therefore, when the two sleeves 8 are close to each other, that is, the sleeve 8 close to the end of the liquid outlet pipe 5 slides toward the end of the liquid inlet pipe 4, it will move with the connecting rod 22, so that the connecting rod 22 rotates and the blocking plate 19 rotates, so that the blocking plate 19 gradually tilts toward the end of the liquid inlet pipe 4 to reach the position as shown in FIG. Figure 5 In the state shown in FIG. 1 , the blocking effect on the hot liquid will be better. On the contrary, when the volume of the accommodating chamber 14 becomes larger, the blocking plate 19 gradually tilts toward the end of the liquid outlet pipe 5 to reach the state shown in FIG. Figure 6 In the state shown, the hindering effect on the hot fluid is reduced.

[0065] The method for using the calendering device comprises the following steps:

[0066] S1: Adjustment, rotating the adjusting bolt 15 to move the sliding sleeve 8 to a suitable position to match the paper width;

[0067] S2: Liquid is introduced, and the liquid pump is started to allow the hot liquid to enter the containing chamber 14 from the liquid inlet pipe 4, and then be discharged from the liquid outlet pipe 5 after heat exchange with the sleeve 7.

[0068] S3: Calendering, the paper is transferred to between the upper calendering roller 2 and the heating roller 3 for calendering.

[0069] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A calendering device for producing inkjet thermal transfer base paper, characterized in that , comprising a frame (1), on which is disposed: An upper pressing roller (2), wherein the upper pressing roller (2) is rotatably arranged on the frame (1); A heating roller (3) is arranged below the upper pressure roller (2), and the two ends of the heating roller (3) are connected with a liquid inlet pipe (4) and a liquid outlet pipe (5). An adjustment component is arranged inside the heating roller (3) for adjusting the distribution area of ​​the hot liquid in the heating roller (3).

2. The calendering device for producing inkjet thermal transfer base paper according to claim 1, characterized in that: The heating roller (3) comprises an intermediate shaft (6) and a sleeve (7) coaxially fixedly arranged outside the intermediate shaft (6), and the adjustment component is arranged in a cavity between the intermediate shaft (6) and the sleeve (7).

3. The calendering device for producing inkjet thermal transfer base paper according to claim 2, characterized in that: The adjustment component comprises: A sliding sleeve (8), wherein two sliding sleeves (8) are provided and arranged opposite to each other, the sliding sleeve (8) has a T-shaped cross section and comprises a cylindrical section (9) and a disc section (10), the cylindrical section (9) and the disc section (10) are provided with a communicating sliding hole (11), the sliding hole (11) cooperates with the intermediate shaft (6) so that the sliding sleeve (8) is slidingly arranged on the intermediate shaft (6), the outer periphery of the disc section (10) is in sealing sliding contact with the inner wall of the sleeve (7), the disc sections (10) of the two sliding sleeves (8) are respectively provided with a liquid inlet hole (12) and a liquid outlet hole (13), the liquid inlet hole (12) is connected to the liquid inlet pipe (4), the liquid outlet hole (13) is connected to the liquid outlet pipe (5), and the inner wall of the sleeve (7) and the outer wall of the two disc sections (10) and the intermediate shaft (6) form a receiving chamber (14) for receiving hot liquid; A driving assembly is used to drive the sliding sleeve (8) to slide along the length direction of the intermediate shaft (6) to adjust the range of the accommodating cavity (14) along the length direction of the heating roller (3).

4. The calendering device for producing inkjet thermal transfer base paper according to claim 3, characterized in that: The drive assembly comprises: an adjusting bolt (15), the adjusting bolt (15) passing through the end of the sleeve (7) and being threadedly connected to the sleeve (7), one end of the adjusting bolt (15) extending into the sleeve (7) and being connected to the end of the disc segment (10) of the sliding sleeve (8) so as to be circumferentially rotatable and axially fixed, and the other end of the adjusting bolt (15) being located outside the sleeve (7); A nut (16) is fixedly arranged on the outer end of the sleeve (7) and is threadedly connected to the adjusting bolt (15).

5. The calendering device for producing inkjet thermal transfer base paper according to claim 3, characterized in that: The end of the disc segment (10) is provided with a tube buckle (17), and the tube buckle (17) is used to fix the positional relationship between the liquid inlet pipe (4) and the liquid outlet pipe (5) and the disc segment (10).

6. The calendering device for producing inkjet thermal transfer base paper according to claim 3, characterized in that: The intermediate shaft (6) is provided with a clearance groove (18), and the clearance groove (18) is used to provide clearance space for the movement of the liquid inlet pipe (4) and the liquid outlet pipe (5).

7. The calendering device for producing inkjet thermal transfer base paper according to claim 3, characterized in that: A blocking plate (19) is arranged in the containing chamber (14) near one end of the liquid outlet pipe (5), and the blocking plate (19) is used to prevent the hot liquid from flowing from the containing chamber (14) to the liquid outlet pipe (5), thereby prolonging the time the hot liquid stays in the containing chamber (14).

8. The calendering device for producing inkjet thermal transfer base paper according to claim 7, characterized in that: A change component is also provided in the accommodating chamber (14), and is used to simultaneously adjust the blocking effect of the blocking plate (19) on the hot liquid flowing from the accommodating chamber (14) to the liquid outlet pipe (5) when the accommodating chamber (14) changes in range along the length direction of the heating roller (3).

9. The calendering device for producing inkjet thermal transfer base paper according to claim 8, characterized in that: The change components include: A first rotating seat (20), wherein the first rotating seat (20) is fixedly arranged on the inner wall of the sleeve (7), and one end of the blocking plate (19) is rotatably connected to the first rotating seat (20); A second rotating seat (21), the second rotating seat (21) being fixedly arranged on the outer wall of the cylindrical section (9) of the sliding sleeve (8); A connecting rod (22) and a slide groove (23) are provided on the blocking plate (19). One end of the connecting rod (22) is rotatably connected to the second rotating seat (21), and the other end is rotatably connected to an end of the blocking plate (19) away from the first rotating seat (20) and is slidably arranged in the slide groove (23).

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