Metal nameplate drilling equipment

Abstract

The present invention relates to the technical field of drilling equipment, and in particular to a metal nameplate drilling equipment, comprising a shell part, a drill head for installing a drill bit is provided at the lower end of the shell part, a cavity part is provided in the interior of the shell part and penetrates upward, the upper end of the shell part is covered with a cover plate, a rotating shaft is slidably installed on the middle part of the cover plate, a second plug rod for pushing air is provided at one end of the rotating shaft located on the inner side of the cavity part, a first air channel is provided at the lower end of the cavity part and passes through the inner wall of the shell part to the upper end of the cover plate, a first valve body is detachably installed at the opening at one end outside the first air channel, and a second air channel connected to the cavity part is provided on the outer end surface of the upper end of the shell part; this metal nameplate drilling equipment solves the shortcomings of the prior art that the outer cover structure and the buffer structure are relatively independent and the structure is bulky.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a metal nameplate drilling equipment. Background Art

[0002] The existing basic structure of the electrified drilling equipment for metal nameplates can refer to the fine drilling equipment for hardware production proposed in the Chinese patent application number "CN202110633225.0", which can control the drilling machine to achieve lateral and longitudinal movement to achieve the drilling effect;

[0003] First, in order to prevent the uncontrolled splashing of waste chips generated during the drilling process, some existing drill bits are equipped with an outer cover structure, such as a construction drilling device proposed in Chinese patent application number "CN202010394003.3", which can not only prevent waste chips from splashing, but also achieve auxiliary limit of drilling depth through the provided protective cover and related limiting mechanism;

[0004] Secondly, in order to reduce the loss caused by the high-intensity impact between the drill bit and the object to be processed, some existing drill bits are equipped with a buffer structure, including a rigid drill bit with a shock-absorbing function proposed in Chinese patent application number "CN202021973361.1", which achieves a buffering effect through the air shock-absorbing airbag and shock-absorbing spring assembly components;

[0005] However, in the prior art, the above two functional structures are independent of each other. If the above two groups of functions are realized simultaneously with the existing structure, the structure will be too complicated and large. For this reason, this case will propose a new type of metal nameplate drilling equipment. The drill mechanism of the equipment has an outer cover structure and a buffer structure, and its structure is also lighter, so as to achieve the functions of preventing waste chips from splashing and drill bit buffering. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art, such as the outer cover structure and the buffer structure are relatively independent and the structure is bulky, and to propose a metal nameplate drilling device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The cam is an airtight container, the interior of the container having the first and second ends connected to the casing to allow the user to move the container upwards and downwards, the container being arranged on a circle with the first and second ends connected to the casing to move the container upwards and downwards.

[0009] Preferably, the lower end of the outer end surface of the bearing part is fixedly mounted with an abutment ring, the outer periphery of the bearing part is threadedly mounted with a fixing ring, the lower end of the fixing ring is movably abutted against the abutment ring, the shielding assembly includes a supporting part, the lower end of the supporting part is fixedly mounted with a baffle extending to the periphery of the drill head part, the outer wall of the supporting part is bent with an installation part, and the installation part is movably abutted between the fixing ring and the abutment ring.

[0010] Preferably, a plurality of groups of balls are rotatably mounted on the bottom of the baffle.

[0011] Preferably, the outer wall of the support portion is provided with a plurality of sliding grooves, sliding blocks are slidably installed inside the plurality of sliding grooves, one end of the plurality of sliding blocks extends to the outside of the support portion and a baffle is fixedly installed thereon, the upper end of the support portion is provided with a sliding cylinder connected to the sliding groove, a connecting portion is connected between the upper ends of the plurality of sliding cylinders, a second valve body is provided on the outer wall of the connecting portion, and the upper end of the sliding block is integrally formed with a third plug rod extending to the inside of the sliding cylinder for pushing air.

[0012] Preferably, the second valve body and the first valve body are both one-way valve body structures.

[0013] Preferably, the support portion is a plurality of independent arc-shaped structures, and the support portions of the plurality of arc-shaped structures are spliced ​​end to end through buckling portions to form a closed structure, and the outer wall of each group of independent support portions is provided with a plurality of sliding grooves, and sliding blocks are slidably installed inside the plurality of sliding grooves, and one end of the plurality of sliding blocks extends to the outside of the support portion and a plurality of baffles are fixedly installed thereon, and a sliding cylinder connected to the sliding groove is provided at the upper end of the support portion, and a connecting portion is connected between the upper ends of the plurality of sliding cylinders located on the same support portion, and a second valve body is provided on the outer wall of the connecting portion, and a third plug rod extending to the inside of the sliding cylinder for pushing air is integrally formed at the upper end of the sliding block.

[0014] Preferably, an abutment wheel which is in sliding abutment with the abutment plate is rotatably mounted on the inner side of the bearing portion.

[0015] Preferably, the cover plate and the rotating shaft are both spline structures.

[0016] Preferably, an external connection portion for connecting to an existing driving structure is provided at one outer end of the rotating shaft.

[0017] Preferably, the lower end of the abutment plate is rotatably connected to the shell portion by a pivot mechanism or the like, the upper end of the abutment plate is rotatably connected to an outer end of the first insertion rod by a pivot mechanism or the like, the abutment plate is arranged to be inclined outward, and the outer wall of the shell portion is provided with a limiting mechanism for abutting against the upper end of the abutment plate, and the minimum distance between the upper end of the abutment plate and the shell portion is greater than the distance between the lower end of the abutment plate and the shell portion.

[0018] The metal nameplate drilling device proposed by the present invention has the following beneficial effects:

[0019] The connected cavity, the first air channel, and the second air channel enable the air pressure to push the first and second plug rods to move forward, thereby enabling the second plug rod to drive the rotating shaft to achieve rigid contact buffering of the drill head up and down, and the first plug rod drives the abutment plate to rotate to achieve damping sliding of the bearing part and the shielding assembly up and down, so that the shielding assembly can better contact the part to be processed. This design allows them to share a set of buffer structures, reducing the complexity of the structure.

[0020] The air pressure in the cavity can be easily changed by the first valve body, so as to achieve different buffering and damping limiting effects;

[0021] Through the shielding assembly that is set up, and the sliding cylinder, third insertion rod and other structures set up in the shielding assembly, the shielding assembly itself has a certain buffering capacity, and the baffle, sliding cylinder, third insertion rod and other structures in the shielding assembly can be independently set up in multiple groups to make it more fit the surface of the part to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the main body;

[0023] Figure 2 The schematic diagram of the explosion dismantling structure of the main body;

[0024] Figure 3 The figure is a cross-sectional view of the main body and a schematic diagram of a partially enlarged structure;

[0025] Figure 4 is a schematic cross-sectional structural diagram of a shell portion;

[0026] Figure 5 It is a schematic cross-sectional view of the support portion and the bearing portion assembly;

[0027] Figure 6 It is a schematic diagram of the three-dimensional and cross-sectional structure of the shielding component.

[0028] In the figure:

[0029] 1. Shell portion; 101. Cover plate; 102. Cavity portion; 103. First air passage; 104. First valve body; 105. Second air passage; 106. Abutment plate; 107. First insertion rod;

[0030] 2. Drill head; 3. Rotating shaft; 301. Second insertion rod; 302. External connection part; 4. Limit block;

[0031] 5. bearing portion; 501. abutment ring; 502. fixing ring; 503. abutment wheel;

[0032] 6. Supporting part; 601. Snap-fitting part; 602. Sliding groove; 603. Sliding cylinder; 604. Connecting part; 605. Second valve body; 606. Mounting part;

[0033] 7. baffle; 701. sliding block; 702. third plug rod; 703. ball bearing. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1-4 , here is an example of the implementation method of the subject:

[0036] A metal nameplate drilling device comprises a shell body 1, a drill head 2 for installing an existing drill bit is provided at the lower end of the shell body 1, a cavity 102 is provided in the interior of the shell body 1 and penetrates upward, the upper end of the shell body 1 is covered with a cover plate 101, a rotating shaft 3 is slidably installed in the middle of the cover plate 101, a second plug rod 301 for pushing air is provided at one end of the rotating shaft 3 located inside the cavity 102, a first air passage 103 is provided at the lower end of the cavity 102 and passes through the inner wall of the shell body 1 to the upper end of the cover plate 101, a first valve body 104 is detachably installed at the opening of one end outside the first air passage 103, and the outer end of the upper end of the shell body 1 is provided with a first valve body 104. A second air passage 105 communicating with the first air passage 103 or the cavity portion 102 is provided on the peripheral end surface, a first plug rod 107 for pushing air is slidably installed inside the second air passage 105, an abutment plate 106 is provided on the periphery of the shell portion 1, and the upper and lower ends of the abutment plate 106 are rotatably connected to the first plug rod 107 and the outer wall of the shell portion 1 respectively, a bearing portion 5 is slidably sleeved on the periphery of the shell portion 1, a shielding assembly is movably engaged with the periphery of the bearing portion 5, and the lower end of the shielding assembly extends to the periphery of the drill head 2 to prevent waste chips from splashing during the drilling process, and an abutment wheel 503 slidably abutting against the abutment plate 106 is rotatably installed on the inner side of the bearing portion 5;

[0037] Based on the above content, the cooperation between the second plug rod 301 and the cavity portion 102 is to achieve the buffering of the drill head 2 through compressed gas, so as to avoid the drill head 2 from hitting the cutter due to excessive downward speed; the first air channel 103 and the first valve body 104 at the opening of the first air channel 103 enable the gas pressure in the cavity portion 102 to be changed, thereby achieving the buffering effect in different states; through the second air channel 105 connected with the first air channel 103, and the first plug rod 107 matched with the second air channel 105, the abutment plate 106 and other components can be controlled to control the resistance generated when the bearing portion 5 slides up and down along the shell portion 1, thereby making the displacement of the shielding component have a damping effect to make it close to the parts, or control the maximum travel range of the shielding component;

[0038] Furthermore, the bearing portion 5 enables a rotational connection between the shielding assembly and the housing portion 1;

[0039] Furthermore, the second air channel 105 may also be directly connected to the cavity portion 102 to facilitate processing;

[0040] For further reference, Figure 3 The drill head 2 can adopt a rotary locking mechanism on an existing electric drill or other device to fix the drill bit. The rotary locking mechanism forms a clamping effect on the drill bit by rotating and driving a plurality of groups of clamping blocks. This part can directly adopt the existing structure, so it will not be described in detail.

[0041] For further reference, Figure 2, wherein the cover plate 101 and the rotating shaft 3 are both spline structures, so that the rotating shaft 3 can only slide up and down along the cover plate 101, and when the rotating shaft 3 rotates along its own central axis, it can drive the combination of the cover plate 101, the shell part 1, the drill head part 2, etc. to rotate;

[0042] Furthermore, an external connection portion 302 for connecting to an output shaft or a driving structure of an existing motor is provided at one end of the outer side of the rotating shaft 3. The external connection portion 302 can be set to different connection structures according to actual use requirements to play a role in driving the rotating shaft 3 to rotate along its own central axis, including Figure 1 The knob locking mechanism shown in the figure can directly adopt the existing structure, so it will not be described in detail;

[0043] Further, under conventional settings, the lower end of the abutment plate 106 is rotatably connected to the lower end of the outer wall of the housing portion 1 by means of a rotating shaft mechanism, and the upper end of the abutment plate 106 is rotatably connected to the outer end of the first insertion rod 107 by means of a rotating shaft mechanism, and the abutment plate 106 is tilted outward, so that the abutment plate 106 can more smoothly push the bearing portion 5 to slide downward along the periphery of the housing portion 1;

[0044] Furthermore, the outer wall of the housing portion 1 should be provided with a limiting mechanism for abutting against the upper end of the abutment plate 106, so that the minimum distance between the upper end of the abutment plate 106 and the housing portion 1 is greater than the distance between the lower end of the abutment plate 106 and the housing portion 1, so as to prevent the bearing portion 5 from moving upwards too long or out of the range of the abutment plate 106;

[0045] Furthermore, the first valve body 104 may adopt a one-way valve body structure such as a valve core, so that air can be input into the cavity portion 102 through the first valve body 104 to adjust the sliding resistance of the first insertion rod 107 and the rebound buffering force of the rotating shaft 3, thereby adjusting the easy rotation angle of the abutment plate 106;

[0046] Furthermore, a limit block 4 is provided on the end surface of the lower end of the second insertion rod 301 opposite to the inner wall of the cavity 102 to limit the maximum insertion length of the rotating shaft 3, thereby preventing the air pressure in the cavity 102 from being too high.

[0047] Reference Figure 5 , 6 Here is an example of an implementation method of the shielding component:

[0048] The lower end of the outer end surface of the bearing portion 5 is fixedly installed with an abutment ring 501 by welding or other methods, and the outer periphery of the bearing portion 5 is threadedly installed with a fixing ring 502, and the lower end of the fixing ring 502 is movably abutted with the abutment ring 501. The shielding assembly includes a support portion 6, and the lower end of the support portion 6 is fixedly installed with a baffle 7 extending to the periphery of the drill head 2, and the outer wall of the support portion 6 is bent inward to form a mounting portion 606, and the mounting portion 606 is movably abutted between the fixing ring 502 and the abutment ring 501;

[0049] Based on the above content, in this embodiment, the support part 6 is detachably mounted with the bearing part 5 through structures such as the abutment ring 501 and the fixing ring 502 to improve the convenience of disassembly and assembly, and the baffle 7 has a surrounding and shielding effect on the drill head 2 to prevent waste chips from splashing;

[0050] Furthermore, a plurality of groups of balls 703 are rotatably mounted on the bottom of the baffle 7, so that the baffle 7 can be in sliding contact with the workpiece to be processed when not fully lifted, thereby reducing friction.

[0051] Here is a second example of an implementation method of the shielding component:

[0052] The outer wall of the support part 6 is provided with a plurality of sliding grooves 602, and a sliding block 701 is slidably installed inside the plurality of sliding grooves 602. One end of the plurality of sliding blocks 701 extends to the outside of the support part 6 and is fixedly installed with a baffle 7. The upper end of the support part 6 is provided with a sliding cylinder 603 connected with the sliding grooves 602. A connecting part 604 is connected between the upper ends of the plurality of sliding cylinders 603. A second valve body 605 is provided on the outer wall of the connecting part 604. The upper end of the sliding block 701 is integrally formed or welded with a third plug rod 702 extending to the inside of the sliding cylinder 603 for pushing air.

[0053] Based on the above content, different from the example 1 of the implementation of the shielding assembly, in this embodiment, the third plug rod 702, the sliding cylinder 603 and other structures provided form an air buffering effect on the baffle 7, further avoiding the rigid contact between the baffle 7 and the part to be processed. When the bearing part 5 cannot move, the baffle 7 still has a certain upward and downward movable space, providing design redundancy;

[0054] Furthermore, the function of the second valve body 605 is the same as that of the first valve body 104 , so that the gas pressure in the connecting portion 604 can be adjusted.

[0055] Here is a third example of an implementation method of the shielding component:

[0056] The support portion 6 is a plurality of independent arc-shaped structures, and the support portions 6 of the plurality of arc-shaped structures are connected end to end by the buckle portion 601 to form a closed structure. The outer wall of each group of independent support portions 6 is provided with a plurality of sliding grooves 602, and sliding blocks 701 are slidably installed inside the plurality of sliding grooves 602 respectively. One end of the plurality of sliding blocks 701 extends to the outer side of the support portion 6 and a plurality of baffles 7 are fixedly installed thereon. A sliding cylinder 603 communicating with the sliding groove 602 is provided at the upper end of the support portion 6, and a connecting portion 604 is connected between the upper ends of the plurality of sliding cylinders 603 located on the same support portion 6, and a second valve body 605 is provided on the outer wall of the connecting portion 604. A third plug rod 702 extending to the inside of the sliding cylinder 603 for pushing air is integrally formed or welded on the upper end of the sliding block 701;

[0057] Based on the above content, different from the second example of the implementation of the shielding component, in this embodiment, the support part 6 is composed of multiple independent individuals spliced ​​end to end to form a closed structure, and each group of support parts 6 is installed with multiple groups of independent baffles 7, sliding blocks 701, third insertion rods 702 and other components. When the surface of the part to be processed is uneven, the multiple groups of independent baffles 7 structures can better contact with the surface of the part to be processed, improve the degree of fit, and further reduce the exposure of waste chips.

[0058] Last addition:

[0059] A limit mechanism should be provided at one end of the outer side of the second air channel 105 to prevent the first insertion rod 107 from being separated from the second air channel 105. At the same time, the first insertion rod 107 itself can have a rotation knot to increase the rotation angle of the abutment plate 106.

[0060] The bearing part 5 and the housing part 1 directly have a sliding structure such as a positioning slide rail, and can also adopt a structure as shown in FIG. 4, that is, a notch is opened on the outer end surface of the housing part 1, and the abutment plate 106 and the abutment wheel 503 are installed inside the notch to form a limiting effect;

[0061] In a natural state, the bottom height of the baffle 7 should be lower than the bottom height of the drill head 2, so that the baffle 7 is in contact with the workpiece to be processed first;

[0062] The fixing ring 502 can also be fixed by buckling or other methods to facilitate subsequent disassembly and assembly operations, and the abutment ring 501 can also be designed to be separated from the bearing part 5 and fixed by screw threads or buckling or other methods;

[0063] Air pressure sensing elements may also be provided in the sliding cylinder 603 and the cavity portion 102 to transmit the air pressure status to the outside through electrical signals or the like, so as to facilitate linkage monitoring;

[0064] A spring for elastically pushing the second insertion rod 301 may be further installed in the cavity portion 102 to further improve the buffering effect.

[0065] Based on the above-mentioned embodiments, when assembling:

[0066] Since the shielding assembly completely covers the drill head 2, the shielding assembly should be removed before disassembling the drill head 2. Hold the outer periphery of the support part 6 and rotate the fixing ring 502 so that the fixing ring 502 is separated from the mounting part 606 and can be removed. After that, the drill head 2 or the external connection part 302 can be freely disassembled. The air pressure in the cavity part 102, the first air channel 103, and the second air channel 105 can be changed by the first valve body 104, and the air pressure in the connecting part 604 can be changed by the second valve body 605.

[0067] Based on the above implementation examples, when used:

[0068] The output end of the existing nameplate drilling equipment is controlled to change the position and the rotation speed. When the position is selected, the housing 1 and its accessories can be driven downward so that the baffle 7 contacts the part to be processed. Due to the provided ball 703, the desired drilling position can be continuously adjusted. When the drilling position is determined, the housing 1 and its accessories can be continuously driven downward. At this time, the multiple groups of baffles 7 are in close contact with the part to be processed under the action of the air pressure in the connecting part 604. When there are slight unevenness on the surface of the part to be processed, the multiple groups of baffles 7 can be automatically moved up and down according to the actual state of the surface of the part to be processed.

[0069] Start the external drive motor to drive the rotating shaft 3 to rotate and press down. Under the action of the cavity portion 102, there is a buffer when the drill head 2 contacts the part to be processed to prevent rigid collision with the tool. At the same time, the baffle 7 pushes the bearing portion 5 to move upward, and the abutment wheel 503 on the bearing portion 5 slides and abuts against the abutment plate 106 and drives the abutment plate 106 to rotate. The first plug rod 107 moves into the second air channel 105. Due to the air pressure in the cavity portion 102, the resistance of the first plug rod 107 gradually increases, so as to play the role of damping, limiting, and prompting, and can limit the maximum rising stroke of the baffle 7.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal nameplate drilling device, comprising a housing (1), a drill head (2) for mounting a drill bit is provided at the lower end of the housing (1), a cavity (102) is provided in the interior of the housing (1) and extends upward therethrough, a cover plate (101) is provided on the upper end of the housing (1), a rotating shaft (3) is slidably mounted on the middle of the cover plate (101) in an upwardly sliding manner, a second insertion rod (301) for pushing air is provided at one end of the rotating shaft (3) located inside the cavity (102), and the device is characterized in that: The lower end of the cavity portion (102) is provided with a first air passage (103) which passes through the inner wall of the shell portion (1) and reaches the upper end of the cover plate (101); a first valve body (104) is detachably mounted at an opening at one end of the outer side of the first air passage (103); a second air passage (105) which is in communication with the cavity portion (102) is provided at the outer end surface of the upper end of the shell portion (1); a first plug rod (107) for pushing air is slidably mounted inside the second air passage (105); an abutment plate (106) is arranged at the periphery of the shell portion (1); upper and lower ends of the abutment plate (106) are rotatably connected to the first plug rod (107) and the outer wall of the shell portion (1), respectively; a bearing portion (5) is slidably sleeved at the upper and lower periphery of the shell portion (1); a shielding component is movably engaged at the periphery of the bearing portion (5).

2. The metal nameplate drilling device according to claim 1, characterized in that: The lower end of the outer end surface of the bearing portion (5) is fixedly mounted with an abutment ring (501), the outer periphery of the bearing portion (5) is threadedly mounted with a fixing ring (502), the lower end of the fixing ring (502) is movably abutted against the abutment ring (501), and the shielding assembly comprises a support portion (6), the lower end of the support portion (6) is fixedly mounted with a baffle (7) extending to the periphery of the drill head portion (2), the outer wall of the support portion (6) is bent with a mounting portion (606), and the mounting portion (606) is movably abutted between the fixing ring (502) and the abutment ring (501).

3. The metal nameplate drilling device according to claim 2, characterized in that: A plurality of groups of balls (703) are rotatably mounted on the bottom of the baffle (7).

4. The metal nameplate drilling device according to claim 2, characterized in that: The outer wall of the support portion (6) is provided with a plurality of sliding grooves (602), and a sliding block (701) is slidably installed inside the plurality of sliding grooves (602). One end of the plurality of sliding blocks (701) extends to the outside of the support portion (6) and is fixedly installed with a baffle (7). The upper end of the support portion (6) is provided with a sliding cylinder (603) connected to the sliding groove (602), and a connecting portion (604) is connected between the upper ends of the plurality of sliding cylinders (603). A second valve body (605) is provided on the outer wall of the connecting portion (604), and the upper end of the sliding block (701) is integrally formed with a third plug rod (702) extending to the inside of the sliding cylinder (603) for pushing air.

5. The metal nameplate drilling device according to claim 4, characterized in that: The second valve body (605) and the first valve body (104) are both one-way valve body structures.

6. The metal nameplate drilling device according to claim 2, characterized in that: The support portion (6) is a plurality of independent arc-shaped structures. The plurality of arc-shaped support portions (6) are connected end to end through a buckling portion (601) to form a closed structure. The outer wall of each independent support portion (6) is provided with a plurality of sliding grooves (602). The interiors of the plurality of sliding grooves (602) are respectively provided with sliding blocks (701) slidably mounted therein. One end of the plurality of sliding blocks (701) extends to the outside of the support portion (6) and is respectively provided with a plurality of baffles (7). The upper end of the support portion (6) is provided with a sliding cylinder (603) connected to the sliding groove (602). The upper ends of the plurality of sliding cylinders (603) located on the same support portion (6) are connected with a connecting portion (604). The outer wall of the connecting portion (604) is provided with a second valve body (605). The upper end of the sliding block (701) is integrally formed with a third plug rod (702) extending to the interior of the sliding cylinder (603) for pushing air.

7. The metal nameplate drilling device according to claim 1, characterized in that: An abutment wheel (503) is rotatably mounted on the inner side of the bearing portion (5) and is in sliding abutment with the abutment plate (106).

8. The metal nameplate drilling device according to claim 1, characterized in that: The cover plate (101) and the rotating shaft (3) are both spline structures.

9. The metal nameplate drilling device according to claim 1, characterized in that: An external connection portion (302) for connecting to an existing drive structure is provided at one outer end of the rotating shaft (3).

10. The metal nameplate drilling device according to claim 1, characterized in that: The lower end of the abutment plate (106) is rotatably connected to the shell part (1) via a rotating shaft mechanism, and the upper end of the abutment plate (106) is rotatably connected to the outer end of the first insertion rod (107) via a rotating shaft mechanism. The abutment plate (106) is arranged to be inclined outwards, and the outer wall of the shell part (1) is provided with a limiting mechanism for abutting against the upper end of the abutment plate (106). The minimum distance between the upper end of the abutment plate (106) and the shell part (1) is greater than the distance between the lower end of the abutment plate (106) and the shell part (1).

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