Automatic film pasting equipment for steel belt

Abstract

The utility model discloses an automatic film pasting device for a steel belt, which comprises a working table, a film pasting device and a film pasting device, the conveying assembly is arranged on the workbench and used for conveying the steel belt to move in the length direction of the workbench; the flattening assembly comprises lower flattening rollers arranged on the inner bottom wall of the workbench in a linear array mode, an adjusting base installed on the inner side wall of the workbench in a sliding mode and an upper flattening roller on the side wall of the adjusting base, and a flattening channel allowing a steel belt to penetrate through is formed between the lower flattening rollers and the upper flattening roller. And the film pasting assembly comprises a roller frame installed at the top of the workbench, a lower rubber roller is rotatably installed on the roller frame, a pressing seat is slidably installed on the roller frame, and an upper rubber roller is rotatably installed on the pressing seat. According to the automatic film pasting equipment for the steel belt, the two steps of flattening and film pasting of the steel belt can be seamlessly connected together, and the integrated machining process is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel strip packaging equipment, in particular to an automatic film sticking equipment for steel strips. Background Art

[0002] In the steel strip processing industry, steel strip leveling and film laminating are two crucial process steps. Steel strip leveling mainly uses a series of equipment to precisely control and process the steel strip to remove the uneven parts on the surface of the steel strip, improve its physical properties, and improve the surface quality. The film laminating process is to stick a specific protective film (such as PE film) on the steel strip after the leveling process to protect the steel strip from damage during subsequent processing or transportation.

[0003] However, in existing steel strip processing production lines, the two process steps of steel strip leveling and film lamination are often carried out separately. This separate design adds unnecessary intermediate links to the production process, thereby reducing overall production efficiency. Specifically, after the steel strip is leveled, it needs to be transferred to another device for film lamination. During this process, the steel strip needs to go through multiple steps such as transmission, positioning, and alignment, which not only increases production time, but may also cause damage or contamination to the steel strip due to improper operation during the transmission process. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an automatic film laminating device for steel strips, which can seamlessly connect the two steps of steel strip flattening and film laminating, thereby realizing an integrated processing flow.

[0005] According to an embodiment of the utility model, an automatic film-sticking device for steel strips includes:

[0006] A workbench for carrying the steel strip;

[0007] A conveying assembly, arranged on the workbench and used for conveying the steel belt to move along the length direction of the workbench;

[0008] A flattening assembly, comprising lower flattening rollers arranged in a linear array on the inner bottom wall of a workbench and an adjustment seat slidably mounted on the inner side wall of the workbench, an upper flattening roller on the side wall of the adjustment seat, and a flattening channel for the steel strip to pass through formed between the lower flattening roller and the upper flattening roller;

[0009] The film sticking assembly comprises a roller frame installed on the top of the workbench, a lower glue roller is rotatably installed on the roller frame, a pressure seat is slidably installed on the roller frame, and an upper glue roller is rotatably installed on the pressure seat.

[0010] According to an automatic film-laminating device for steel strips in an embodiment of the utility model, the conveying assembly includes a lower conveying roller rotatably mounted inside a workbench, a slider is slidably mounted on the side wall of the workbench, an upper conveying roller is rotatably mounted on the slider, the lower conveying roller and the upper conveying roller are symmetrically arranged, and a cylinder is also installed on the top of the workbench, and the telescopic end of the cylinder is fixedly connected to the top surface of the slider.

[0011] According to an automatic film-laminating device for steel strips according to an embodiment of the utility model, the flattening component also includes a mounting shell installed on the top of the workbench, a threaded sleeve is rotatably installed inside the mounting shell, a threaded rod is connected to the internal thread of the threaded sleeve, the bottom end of the threaded rod extends to the interior of the workbench and is rotatably connected to the top surface of the adjustment seat, a worm gear is fixedly installed on the outer wall of the threaded sleeve, and a worm gear meshing with the worm gear is rotatably installed on the mounting shell.

[0012] According to an automatic film-laminating device for steel strips in an embodiment of the utility model, the flattening assembly also includes an indicating component, which includes a flat plate fixedly mounted on the top of a threaded rod and a bracket mounted on the top surface of a workbench, a digital height gauge is mounted on the bracket, and an instrument tube of the digital height gauge is in contact with the top surface of the flat plate.

[0013] According to an embodiment of the utility model, an automatic film-sticking device for steel strips also includes a material guide assembly arranged on the left and right sides of the workbench, the material guide assembly includes a material guide frame fixedly connected to the outer wall of the workbench, a material guide roller is rotatably mounted on the material guide frame, a mounting frame is fixedly mounted on the material guide frame, a sliding seat is slidably mounted on the mounting frame, and a guide roller is rotatably mounted on the sliding seat.

[0014] According to an automatic film laminating device for steel strips in an embodiment of the utility model, the film laminating assembly further comprises a placement seat arranged on the top surface of a roller frame, a winding roller is rotatably mounted on the placement seat, and a PE film for laminating on the steel strip is wound on the winding roller.

[0015] According to an automatic film-laminating device for steel strips in an embodiment of the utility model, open grooves are symmetrically installed on the side walls of the roller frame, limiting rods are symmetrically installed inside the open grooves, the pressure seat is slidably connected to the limiting rods, and a clamping spring is also sleeved on the limiting rods, the bottom end of the clamping spring is fixedly connected to the top surface of the pressure seat, and the top end of the clamping spring is fixedly connected to the inner top wall of the open groove.

[0016] According to an embodiment of the utility model, an automatic film-laminating device for steel strips also includes a detection component arranged on a workbench, wherein the detection component includes a sleeve rod fixedly connected to the workbench, a sliding rod is slidably installed inside the sleeve rod, a pressure roller that fits the PE film is rotatably installed on the sliding rod, a supporting spring for pushing the sliding rod to slide outside the sleeve rod is installed inside the sleeve rod, a positioning frame is fixedly installed on the outer top wall of the sliding rod, one end of the positioning frame is fixedly connected to a trigger switch, a switch contact horizontally symmetrical with the trigger switch is fixedly installed on the top of the sleeve rod, and an alarm electrically connected to the trigger switch is also installed on the top of the positioning frame.

[0017] According to an embodiment of the utility model, an automatic film-sticking device for steel strips has at least the following beneficial effects:

[0018] 1. The utility model can flatten the steel strip conveyed in the flattening channel through the cooperation of the lower flattening roller and the upper flattening roller, and can apply film to the steel strip conveyed on the workbench through the cooperation of the lower rubber roller and the upper rubber roller, and seamlessly connect the two steps of steel strip flattening and film applying, realizing an integrated processing flow, which can not only eliminate the intermediate links in the production process, reduce the transmission time and pollution risk of the steel strip, but also reduce the investment in equipment and manpower, improve production efficiency and reduce costs

[0019] 2. The utility model can drive the worm gear meshing with it to rotate by rotating the worm, and the worm gear drives the threaded sleeve to rotate on the mounting shell, and the mounting shell drives the threaded rod connected to its internal thread to move vertically, and the threaded rod drives the adjustment seat to move synchronously, thereby achieving the effect of adjusting the distance between the lower flattening roller and the upper flattening roller according to the thickness of the steel strip, thereby improving the applicability of the device

[0020] 3. The utility model uses the elastic force of the supporting spring to push the slide bar to drive the pressure roller to press on the surface of the PE film. When the PE film breaks, the slide bar slides forward under the elastic force of the supporting spring, driving the positioning frame and the trigger switch to press the switch contact, causing the alarm to sound an alarm, and promptly notifying the staff to go and deal with it, which can improve production efficiency, reduce production costs, ensure the stability and reliability of the film-sticking process, and improve product quality.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the material guide assembly in the utility model;

[0025] Figure 3 It is a structural schematic diagram of the flattening component in the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the film sticking component in the utility model;

[0027] Figure 5 It is a structural schematic diagram of the detection component in the utility model.

[0028] Reference numerals:

[0029] 1. Workbench;

[0030] 2. material guide assembly; 21. material guide frame; 22. material guide roller; 23. mounting frame; 24. sliding seat; 25. guide roller;

[0031] 3. Conveying assembly; 31. Lower conveying roller; 32. Sliding block; 33. Upper conveying roller; 34. Cylinder;

[0032] 4. Flattening assembly; 41. Lower flattening roller; 42. Adjusting seat; 43. Upper flattening roller; 44. Mounting shell; 45. Threaded sleeve; 46. Worm gear; 47. Threaded rod; 48. Worm; 49. Indicating component; 491. Flat plate; 492. Bracket; 493. Digital height gauge;

[0033] 5. Film laminating assembly; 51. Roller frame; 52. Lower rubber roller; 53. Pressing seat; 54. Compression spring; 55. Upper rubber roller; 56. Placement seat; 57. Winding roller; 58. PE film;

[0034] 6. Detection component; 61. Sleeve rod; 62. Slide rod; 63. Support spring; 64. Positioning frame; 65. Trigger switch; 66. Switch contact; 67. Alarm; 68. Pressure roller. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] An automatic film-applying device for steel strips according to an embodiment of the utility model will be described below in conjunction with the accompanying drawings.

[0040] Reference Figure 1-5 The utility model aims to provide an embodiment of a steel strip automatic film pasting device.

[0041] An automatic film-sticking device for steel strips according to an embodiment of the utility model comprises: a workbench 1 for carrying the steel strips;

[0042] A conveying assembly 3 is arranged on the workbench 1 and is used for conveying the steel strip to move along the length direction of the workbench 1; a flattening assembly 4 includes lower flattening rollers 41 arranged in a linear array on the inner bottom wall of the workbench 1 and an adjusting seat 42 slidably installed on the inner side wall of the workbench 1, and an upper flattening roller 43 is arranged on the side wall of the adjusting seat 42, and a flattening channel for the steel strip to pass through is formed between the lower flattening roller 41 and the upper flattening roller 43; a film laminating assembly 5 includes a roller frame 51 installed on the top of the workbench 1, a lower rubber roller 52 is rotatably installed on the roller frame 51, a pressure seat 53 is slidably installed on the roller frame 51, and an upper rubber roller 55 is rotatably installed on the pressure seat 53;

[0043] It is easy to understand that in this embodiment, the steel strip conveyed in the leveling channel can be leveled through the cooperation of the lower leveling roller 41 and the upper leveling roller 43, and the steel strip conveyed on the workbench 1 can be coated with a film through the cooperation of the lower rubber roller 52 and the upper rubber roller 55. The two steps of steel strip leveling and film coating are seamlessly connected together to realize an integrated processing flow, which can not only eliminate the intermediate links in the production process, reduce the transmission time and pollution risk of the steel strip, but also reduce the investment in equipment and manpower, improve production efficiency and reduce costs.

[0044] In some specific embodiments of the present invention, the conveying assembly 3 can include a lower conveying roller 31 rotatably installed inside the workbench 1, a slider 32 is slidably installed on the side wall of the workbench 1, an upper conveying roller 33 is rotatably installed on the slider 32, the lower conveying roller 31 and the upper conveying roller 33 are symmetrically arranged, and a cylinder 34 is also installed on the top of the workbench 1, and the telescopic end of the cylinder 34 is fixedly connected to the top surface of the slider 32.

[0045] It is easy to understand that in this embodiment, the cylinder 34 can drive the slider 32 to move vertically. During the movement of the slider 32, the upper conveying roller 33 is driven to move away from and closer to the lower conveying roller 31, thereby achieving the effect of adjusting the distance between the slider 32 and the upper conveying roller 33 according to the thickness of the steel strip. The lower conveying roller 31 can be driven to rotate by the motor, and the lower conveying roller 31 can cooperate with the slider 32 to drive the steel strip to be conveyed on the workbench 1.

[0046] In some specific embodiments of the present invention, the flattening assembly 4 may further include a mounting shell 44 mounted on the top of the workbench 1, a threaded sleeve 45 being rotatably mounted inside the mounting shell 44, a threaded rod 47 being internally threadedly connected to the threaded sleeve 45, the bottom end of the threaded rod 47 extending to the interior of the workbench 1 and being rotatably connected to the top surface of the adjustment seat 42, a worm gear 46 being fixedly mounted on the outer wall of the threaded sleeve 45, and a worm 48 being rotatably mounted on the mounting shell 44 and meshing with the worm gear 46.

[0047] It is easy to understand that in this embodiment, the worm gear 46 meshing with the worm gear 48 can be driven to rotate by rotating the worm gear 48, and the worm gear 46 drives the threaded sleeve 45 to rotate on the mounting shell 44. The mounting shell 44 drives the threaded rod 47 connected to its internal thread to move vertically, and the threaded rod 47 drives the adjustment seat 42 to move synchronously, thereby achieving the effect of adjusting the distance between the lower flattening roller 41 and the upper flattening roller 43 according to the thickness of the steel strip, thereby improving the applicability of the device.

[0048] In some specific embodiments of the present invention, the flattening assembly 4 may further include an indicating component 49, which includes a flat plate 491 fixedly mounted on the top of the threaded rod 47 and a bracket 492 mounted on the top surface of the workbench 1, a digital height gauge 493 is mounted on the bracket 492, and an instrument tube of the digital height gauge 493 is in contact with the top surface of the flat plate 491.

[0049] It is easy to understand that the threaded rod 47 of this embodiment will drive the flat plate 491 to move synchronously during the up and down movement. The instrument tube of the digital height gauge 493 refers to the general term for the digital tube and its connecting parts, which are used to display the height value. When the height gauge head contacts the object on the flat plate 491, the change of the numbers on the digital instrument tube will display the height of the upper flattening roller 43 to achieve the effect of precise adjustment.

[0050] In some specific embodiments of the utility model, it may also include a material guide assembly 2 arranged on the left and right sides of the workbench 1, the material guide assembly 2 includes a material guide frame 21 fixedly connected to the outer wall of the workbench 1, a material guide roller 22 is rotatably mounted on the material guide frame 21, a mounting frame 23 is fixedly mounted on the material guide frame 21, a sliding seat 24 is slidably mounted on the mounting frame 23, and a guide roller 25 is rotatably mounted on the sliding seat 24.

[0051] It is easy to understand that in this embodiment, the guide frame 21 and the guide roller 22 are provided to support the steel belt during the conveying process, and the mounting frame 23, the sliding seat 24 and the guide roller 25 cooperate to guide the steel belt during the conveying process.

[0052] In some specific embodiments of the present invention, the film laminating assembly 5 may further include a placement seat 56 disposed on the top surface of the roller frame 51, on which a winding roller 57 is rotatably mounted, and on which a PE film 58 for laminating to the steel belt is wound.

[0053] It is easy to understand that, in this embodiment, the placement of the placement seat 56 and the winding roller 57 facilitates the placement of the PE film 58 on the workbench 1 .

[0054] In some specific embodiments of the present invention, an open groove can be symmetrically installed on the side wall of the roller frame 51, a limiting rod can be symmetrically installed inside the open groove, the pressure seat 53 is slidably connected to the limiting rod, and a clamping spring 54 is also sleeved on the limiting rod. The bottom end of the clamping spring 54 is fixedly connected to the top surface of the pressure seat 53, and the top end of the clamping spring 54 is fixedly connected to the inner top wall of the open groove.

[0055] It is easy to understand that in this embodiment, the limiting rod can limit and guide the sliding of the pressure seat 53, thereby improving the sliding stability of the pressure seat 53. At the same time, the elastic force of the clamping spring 54 can push the upper rubber roller 55 close to the lower rubber roller 52, thereby ensuring that the PE film 58 can be attached to the outer surface of the steel belt during the film laminating process.

[0056] In some specific embodiments of the utility model, it also includes a detection component 6 arranged on the workbench 1, and the detection component 6 includes a sleeve rod 61 fixedly connected to the workbench 1, a slide rod 62 is slidably installed inside the sleeve rod 61, a pressure roller 68 that fits the PE film 58 is rotatably installed on the slide rod 62, a support spring 63 for pushing the slide rod 62 to slide outside the sleeve rod 61 is installed inside the sleeve rod 61, a positioning frame 64 is fixedly installed on the outer top wall of the slide rod 62, one end of the positioning frame 64 is fixedly connected to a trigger switch 65, a switch contact 66 horizontally symmetrical with the trigger switch 65 is fixedly installed on the top of the sleeve rod 61, and an alarm 67 electrically connected to the trigger switch 65 is also installed on the top of the positioning frame 64.

[0057] Specifically, when the film is applied, the elastic force of the support spring 63 pushes the slide bar 62 to drive the pressure roller 68 to press on the surface of the PE film 58. When the PE film 58 breaks, the slide bar 62 slides forward under the elastic force of the support spring 63, driving the positioning frame 64 and the trigger switch 65 to press the switch contact 66, causing the alarm 67 to sound an alarm, and promptly notifying the staff to go for processing, which can improve production efficiency, reduce production costs, ensure the stability and reliability of the film application process, and improve product quality.

[0058] Working principle: The lower conveying roller 31 can be driven to rotate by an electric motor, and the lower conveying roller 31 can cooperate with the slider 32 to drive the steel strip to be conveyed on the workbench 1. The lower flattening roller 41 and the upper flattening roller 43 can cooperate to flatten the steel strip conveyed in the flattening channel. The lower rubber roller 52 and the upper rubber roller 55 can cooperate to apply film to the steel strip conveyed on the workbench 1. The two steps of steel strip flattening and film applying are seamlessly connected together to realize an integrated processing flow, which can not only eliminate the intermediate links in the production process, reduce the transmission time and pollution risk of the steel strip, but also reduce the investment in equipment and manpower, improve production efficiency and reduce costs.

[0059] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A steel strip automatic film laminating device, characterized in that: include: A workbench (1) for carrying the steel strip; A conveying assembly (3), arranged on the workbench (1) and used for conveying the steel belt to move along the length direction of the workbench (1); A flattening assembly (4) comprising lower flattening rollers (41) arranged in a linear array on the inner bottom wall of the workbench (1) and an adjustment seat (42) slidably mounted on the inner side wall of the workbench (1), and an upper flattening roller (43) on the side wall of the adjustment seat (42), wherein a flattening channel for the steel strip to pass through is formed between the lower flattening roller (41) and the upper flattening roller (43); The film laminating assembly (5) comprises a roller frame (51) mounted on the top of the workbench (1), a lower glue roller (52) being rotatably mounted on the roller frame (51), a pressure seat (53) being slidably mounted on the roller frame (51), and an upper glue roller (55) being rotatably mounted on the pressure seat (53).

2. The automatic film-sticking equipment for steel strip according to claim 1, characterized in that: The conveying assembly (3) comprises a lower conveying roller (31) rotatably mounted inside the workbench (1), a slider (32) slidably mounted on the side wall of the workbench (1), an upper conveying roller (33) rotatably mounted on the slider (32), the lower conveying roller (31) and the upper conveying roller (33) being symmetrically arranged, and a cylinder (34) is also mounted on the top of the workbench (1), the telescopic end of the cylinder (34) being fixedly connected to the top surface of the slider (32).

3. The automatic film-sticking equipment for steel strip according to claim 1 is characterized in that: The flattening assembly (4) further comprises a mounting shell (44) mounted on the top of the workbench (1); a threaded sleeve (45) is rotatably mounted inside the mounting shell (44); a threaded rod (47) is internally threadedly connected to the threaded sleeve (45); the bottom end of the threaded rod (47) extends into the interior of the workbench (1) and is rotatably connected to the top surface of the adjustment seat (42); a worm gear (46) is fixedly mounted on the outer wall of the threaded sleeve (45); and a worm (48) meshingly connected to the worm gear (46) is rotatably mounted on the mounting shell (44).

4. The automatic film-sticking equipment for steel strips according to claim 3 is characterized in that: The flattening assembly (4) further comprises an indicating component (49), the indicating component (49) comprising a flat plate (491) fixedly mounted on the top of the threaded rod (47) and a bracket (492) mounted on the top surface of the workbench (1), a digital height gauge (493) being mounted on the bracket (492), and an instrument tube of the digital height gauge (493) being in contact with the top surface of the flat plate (491).

5. The automatic film-sticking equipment for steel strips according to claim 1 is characterized in that: It also comprises a material guide assembly (2) arranged on the left and right sides of the workbench (1), the material guide assembly (2) comprising a material guide frame (21) fixedly connected to the outer wall of the workbench (1), a material guide roller (22) rotatably mounted on the material guide frame (21), a mounting frame (23) fixedly mounted on the material guide frame (21), a sliding seat (24) slidably mounted on the mounting frame (23), and a guide roller (25) rotatably mounted on the sliding seat (24).

6. The automatic film-sticking equipment for steel strip according to claim 1, characterized in that: The film laminating assembly (5) further comprises a placement seat (56) arranged on the top surface of the roller frame (51), a winding roller (57) being rotatably mounted on the placement seat (56), and a PE film (58) for laminating to the steel belt being wound on the winding roller (57).

7. The automatic film-sticking equipment for steel strips according to claim 1 is characterized in that: An open groove is symmetrically mounted on the side wall of the roller frame (51), a limit rod is symmetrically mounted inside the open groove, the pressure seat (53) is slidably connected to the limit rod, a clamping spring (54) is sleeved on the limit rod, the bottom end of the clamping spring (54) is fixedly connected to the top surface of the pressure seat (53), and the top end of the clamping spring (54) is fixedly connected to the inner top wall of the open groove.

8. The automatic film-sticking equipment for steel strips according to claim 6 is characterized in that: The invention also comprises a detection assembly (6) arranged on the workbench (1), the detection assembly (6) comprising a sleeve rod (61) fixedly connected to the workbench (1), a slide rod (62) slidably mounted inside the sleeve rod (61), a pressure roller (68) which is rotatably mounted on the slide rod (62) and is in contact with the PE film (58), a support spring (63) for pushing the slide rod (62) to slide outside the sleeve rod (61) is mounted inside the sleeve rod (61), a positioning frame (64) is fixedly mounted on the outer top wall of the slide rod (62), one end of the positioning frame (64) is fixedly connected to a trigger switch (65), a switch contact (66) horizontally symmetrical to the trigger switch (65) is fixedly mounted on the top of the sleeve rod (61), and an alarm (67) electrically connected to the trigger switch (65) is also mounted on the top of the positioning frame (64).

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