Insulin injection device suitable for old people

Abstract

The invention provides an insulin injection device suitable for old people, and relates to the field of insulin injection devices, the insulin injection device comprises a pen body, the rear end of the pen body is provided with a dosage knob; the left side and the right side of the connecting ferrule are each provided with a connecting plate, the front end face of the connecting plate on the left side is fixedly connected with a threaded rod, and the outer portion of the threaded rod is connected with a limiting nut through threads. Through the cooperative design of a limiting plate, a threaded rod and a limiting nut, the precision when the elderly set the insulin injection dosage by himself / herself is improved, the treatment effect is guaranteed, severe risks such as hypoglycemia caused by excessive dosage can be effectively avoided, and the use safety is improved; the insulin injection pen solves the problems that an existing insulin injection pen needs to rotate a dosage knob to set dosage, old people are difficult to clearly identify fine scales on a dosage window due to vision degeneration, consequently, the phenomenon of inaccurate dosage setting frequently occurs, the treatment effect is affected, risks such as hypoglycemia are possibly caused, and the use safety is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of insulin injection devices, and in particular to an insulin injection device suitable for the elderly. Background Art

[0002] As the global aging population accelerates, the number of elderly patients with diabetes continues to rise. Insulin therapy, as a key method for managing diabetes, has become widely used among elderly patients. Insulin therapy requires an insulin injection device. Commonly used insulin injection devices include standard syringes, insulin pens, and insulin pumps.

[0003] However, when using existing insulin pens, users need to set the insulin dose by rotating the dose knob before injection. However, due to the common visual deterioration of the elderly (such as presbyopia, cataracts, etc.), it is difficult for them to clearly identify the small scale on the dose window, which makes it very easy to overdose when setting the dose. This inaccurate adjustment not only affects the treatment effect, but may also cause serious risks such as hypoglycemia due to overdose, greatly reducing the safety of using insulin pens. Summary of the Invention

[0004] The present invention relates to an insulin injection device suitable for the elderly. It solves the problem that existing insulin injection pens require rotating a dosage knob to set the dosage, and the elderly have deteriorating eyesight and find it difficult to clearly identify the small scale on the dosage window, resulting in frequent inaccurate dosage setting, which not only affects the treatment effect but also may cause risks such as hypoglycemia, thereby greatly reducing the safety of use.

[0005] According to a first aspect of the present invention, there is provided an insulin injection device suitable for the elderly, specifically comprising: a pen body, a dosage knob being provided at the rear end of the pen body; an annular rotation groove being provided on the outer circumference of the dosage knob, and a connecting ring being rotatably connected inside the annular rotation groove, a connecting plate being provided on both left and right sides of the connecting ring, and a threaded rod being fixedly connected to the front end face of the left connecting plate, and a limit nut being connected to the outside of the threaded rod through a thread; a limit plate being fixedly connected to the rear end of the left side of the outer side of the pen body, and the limit plate being located behind the limit nut; an annular connecting block being provided on the inner side of the front end face of the limit nut, and an annular connecting plate being rotatably connected to the outside of the annular connecting block; two locking parts being installed on the front end face of the annular connecting plate in a left-right symmetrical shape; a strip slide groove being provided on the threaded rod, a guide slider being provided on the upper inner circumference face of the annular connecting plate, and the guide slider being slidably connected to the strip slide groove; a rectangular plug-in groove being provided on the front end face of the limit nut in a ring array.

[0006] Furthermore, a cartridge holder is installed at the front end of the pen body, and an insulin cartridge is installed inside the cartridge holder, and a needle is installed at the front end of the cartridge holder.

[0007] Furthermore, a guide slide is fixedly connected to the front end surface of the right connecting plate, and a guide slide is slidably connected to the outside of the guide slide, and the guide slide is fixedly connected to the right rear end of the outer peripheral surface of the pen body.

[0008] Furthermore, an annular connecting groove is formed on the rear end surface of the annular connecting plate, and the annular connecting groove is rotatably connected to the annular connecting block.

[0009] Furthermore, the locking portion includes a support frame, which is fixedly connected to the front end face of the annular connecting plate, and a sliding block is slidably connected inside the support frame, the rear end face of the sliding block is fixedly connected to a plug-in plate that passes through the rear side wall of the support frame, and the front end face of the sliding block is fixedly connected to a spring guide rod that passes through the front side wall of the support frame, and the outside of the spring guide rod is located inside the support frame and is sleeved with a spring.

[0010] Furthermore, when the locking portion is in the locked limit state, the plug-in plate is plugged into the rectangular plug-in slot.

[0011] Furthermore, the upper and lower edges and corners of the rear end surface of the plug board are both chamfered.

[0012] The two lever arrangement comprises a first end portion and a second end portion, wherein the first and second limit switches are connected to each other with a pin to move the pins to the left and right sides of the two limit switches, the pins being connected to the first and second limit switches.

[0013] Furthermore, a plug-in column is fixedly connected to the rear ends of the two sliding plates on their back sides, and a circular plug hole is opened on the left and right sides of the rectangular bayonet.

[0014] Furthermore, when the auxiliary limiting assembly is in the limiting state, the two trapezoidal buckles are both engaged with the rectangular bayonet, and the two plug-in columns are respectively engaged with the two circular plug-in holes.

[0015] The present invention provides an insulin injection device suitable for the elderly, which has the following beneficial effects: First, the present invention uses the coordinated design of the limiting plate, the threaded rod and the limiting nut. When pre-setting the insulin injection dose, the young family member can first pre-adjust the required insulin injection dose for the elderly by rotating the dose knob, and then complete the locking by adjusting the limiting distance of the limiting nut. In this way, when the elderly set the injection dose by themselves, they only need to feel that the dose knob cannot be rotated further in the clockwise direction to know that the current dose has reached the preset standard value, thereby effectively avoiding the phenomenon of excessive or insufficient dose setting value, significantly improving the accuracy of the elderly in setting the insulin injection dose by themselves, not only ensuring the therapeutic effect of insulin, but also effectively avoiding serious risks such as hypoglycemia caused by excessive dose, and greatly improving the safety of the use of the present insulin injection device.

[0016] Secondly, the present invention adopts the coordinated design of the locking part and the rectangular plug-in slot. After the limiting distance of the limit nut is adjusted, the two sliding plates can be pinched in relative directions to make the two sliding blocks lose their limiting effect. Then, the two sliding blocks move backward with the two plug-in plates under the action of the spring elastic force outside the spring guide rod, so that the two plug-in plates are automatically inserted into the corresponding rectangular plug-in slots, thereby forming an effective locking limit for the limit nut and avoiding the loosening of the limit nut, thereby greatly improving the reliability of the limit nut during limitation, and thus further ensuring the accuracy of the elderly when setting their own insulin injection doses.

[0017] Third, the present invention can simultaneously pull out the plug-in boards through the provision of an auxiliary limit assembly. During operation, it is only necessary to pinch the first pinching plate and the second pinching plate in opposite directions. After the two plug-in boards are pulled out from the rectangular plug-in slots, the first pinching plate and the second pinching plate are released. At this time, the two trapezoidal buckles are engaged with the rectangular bayonet sockets, and the two plug-in columns are respectively engaged with the two circular plug holes, so that the plug-in boards are limited. The two plug-in boards in the pulled-out state can be effectively limited, so that when rotating the limit nut, there is no need to pinch the first pinching plate and the second pinching plate in opposite directions by hand, which effectively simplifies the operation process and significantly improves the convenience of the limit nut adjustment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings of the present invention will be briefly introduced below.

[0019] In the attached figure: Figure 1 A schematic structural diagram of the three-dimensional viewing angle of the present application is shown; Figure 2 It shows a schematic diagram of the structure of the overall structure of the present application in a disassembled state; Figure 3 A schematic diagram of the structure of the threaded rod, limit nut, annular connecting plate and locking portion after being disassembled is shown; Figure 4 A schematic diagram of a partial cross-section of the structure of the limit nut and the annular connecting block of the present application is shown; Figure 5 A schematic diagram of a partial cross-section of the annular connecting plate of the present application is shown; Figure 6 A schematic structural diagram of the locking portion and the auxiliary limiting assembly of the present application is shown; Figure 7 A schematic diagram of a partial cross-section of the support frame of the present application is shown; Figure 8 It shows a schematic structural diagram of the auxiliary limit assembly of the present application in a disassembled state; Figure 9 A schematic structural diagram of a partial cross-section of the limiting nut and the annular connecting plate of the present application is shown.

[0020] Reference Signs List 1. Pen body; 101. Dosage knob; 102. Refill holder; 103. Insulin refill; 104. Needle; 105. Stop plate; 106. Annular rotation groove; 2. Connecting ring; 201. Connecting plate; 202. Threaded rod; 203. Guide slide; 204. Guide slide; 205. Strip slide; 3. Limit nut; 301. Annular connecting plate; 302. Annular connecting block; 303. Annular connecting groove; 304. Guide slider; 305. Rectangular plug-in groove; 4. Locking part; 401. Support frame; 402. Sliding block; 403. Plug-in board; 404. Spring guide rod; 5. Auxiliary limit assembly; 501. First pinching plate; 502. Second pinching plate; 503. Rectangular bayonet; 504. Rectangular slide tube; 505. Sliding plate; 506. Trapezoidal buckle; 507. Partition; 508. Sliding guide rod; 509. Connecting column; 5010. Circular socket. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 9 : The present invention proposes an insulin injection device suitable for the elderly, comprising: a pen body 1, a dosage knob 101 being provided at the rear end of the pen body 1; an annular rotation groove 106 being provided on the outer circumference of the dosage knob 101, and a connecting ring 2 being rotatably connected inside the annular rotation groove 106, a connecting plate 201 being provided on both the left and right sides of the connecting ring 2, and a threaded rod 202 being fixedly connected to the front end face of the left connecting plate 201, and a limit nut 3 being connected to the outside of the threaded rod 202 by a thread; a limit plate 105 being fixedly connected to the rear end of the left side of the pen body 1, and the limit plate 105 being located behind the limit nut 3; an annular connecting block 302 being provided on the inner side of the front end face of the limit nut 3, and the annular connecting block 302 being rotatably connected to the outside of the It is connected to an annular connecting plate 301; the front end surface of the annular connecting plate 301 is symmetrically installed with two locking parts 4; a strip slide groove 205 is provided on the threaded rod 202, and a guide slider 304 is provided on the upper inner circumference of the annular connecting plate 301, and the guide slider 304 is slidably connected to the strip slide groove 205; the front end surface of the limit nut 3 is provided with a rectangular plug-in groove 305 in the shape of an annular array, which is used to plug into the plug-in plate 403, and through the plug-in action of the plug-in plate 403 and the rectangular plug-in groove 305, an effective locking limit is formed on the limit nut 3 to prevent the limit nut 3 from loosening, thereby improving the reliability of the limit nut 3 when limiting, and ensuring the accuracy of the elderly when setting their own insulin injection doses.

[0023] A cartridge holder 102 is installed at the front end of the pen body 1, and an insulin cartridge 103 is installed inside the cartridge holder 102. A needle 104 is installed at the front end of the cartridge holder 102 to facilitate insulin injection.

[0024] A guide slide 203 is fixedly connected to the front end of a connecting plate 201 on the right side, and a guide slide 204 is slidably connected to the outside of the guide slide 203. The guide slide 204 is fixedly connected to the rear end of the right side of the outer circumference of the pen body 1. Through the guiding effect of the guide slide 204 and the guide slide 203, the connecting ring 2 and the connecting plate 201 can move forward and backward more smoothly with the threaded rod 202 and the limit nut 3.

[0025] An annular connecting groove 303 is formed on the rear end surface of the annular connecting plate 301 , and the annular connecting groove 303 is rotatably connected to the annular connecting block 302 for connecting the annular connecting plate 301 .

[0026] The locking portion 4 includes a support frame 401, which is fixedly connected to the front end face of the annular connecting plate 301, and a sliding block 402 is slidably connected to the inside of the support frame 401, and the rear end face of the sliding block 402 is fixedly connected to a plug-in plate 403 that passes through the rear side wall of the support frame 401, and the front end face of the sliding block 402 is fixedly connected to a spring guide rod 404 that passes through the front side wall of the support frame 401, and the outside of the spring guide rod 404 is located inside the support frame 401 and is sleeved with a spring; when the locking portion 4 is in a locked limit state, the plug-in plate 403 is plugged into the rectangular plug-in groove 305; through the coordinated design of the locking portion 4 and the rectangular plug-in groove 305, the limit nut 3 can be locked and limited to avoid the limit nut 3 from loosening, thereby effectively improving the reliability of the limit nut 3 when limiting.

[0027] The upper and lower edges of the rear end surface of the plug board 403 are both chamfered. The chamfering makes it smoother for the rear end of the plug board 403 to be inserted into the rectangular plug slot 305 .

[0028] Example 2, based on Example 1, Figure 6 and Figure 8 As shown, it also includes an auxiliary limiting component 5, which is arranged between the two locking parts 4, and the auxiliary limiting component 5 includes a first pinching plate 501 and a second pinching plate 502. The first pinching plate 501 is fixedly connected between the upper end surfaces of the two sliding blocks 402, and the front end surface of the first pinching plate 501 is provided with a rectangular bayonet 503; the second pinching plate 502 is fixedly connected between the front end surfaces of the two support frames 401, and the front end surface of the second pinching plate 502 is provided with a rectangular through-hole, and a rectangular sliding tube 504 is fixedly connected in the rectangular through-hole, and a partition 507 is fixedly connected to the middle side of the rectangular sliding tube 504, and the left and right end surfaces of the partition 507 are fixedly connected to sliding guide rods 508. The inside of the tube 504 is slidably connected to two sliding plates 505 through a sliding guide rod 508, and the two sliding plates 505 are respectively located on the left and right sides of the partition 507, and the two sliding plates 505 are symmetrically distributed on the left and right sides. A spring is sleeved on the outside of each sliding guide rod 508, and the external spring of the sliding guide rod 508 is located between the partition 507 and the sliding plate 505. A trapezoidal buckle 506 is provided at the rear end of each sliding plate 505, and the width of the rear end surface of the trapezoidal buckle 506 is smaller than the width of the bottom end surface of the sliding plate 505; through the setting of the auxiliary limit assembly 5, the plug-in board 403 can be pulled out at the same time, which effectively simplifies the operation process and significantly improves the convenience of the adjustment process of the limit nut 3.

[0029] The two sliding plates 505 are fixedly connected to a plug-in column 509 at the rear ends of the back faces, and a circular socket 5010 is provided on the left and right sides of the rectangular bayonet 503; when the auxiliary limit assembly 5 is in the limit state, the two trapezoidal buckles 506 are both engaged with the rectangular bayonet 503, and the two plug-in columns 509 are respectively engaged with the two circular sockets 5010. Through the plug-in limitation of the plug-in column 509 and the circular socket 5010, the reliability of limiting the first pinching plate 501 can be improved.

[0030] The working principle of the present invention is as follows: when in use, when the insulin injection dose is pre-set, the young family member first adjusts the insulin injection dose required by the elderly by rotating the dose knob 101. During the clockwise rotation of the dose knob 101, the dose knob 101 will move backward with the connecting ring 2, the connecting plate 201, the threaded rod 202 and the limit nut 3 under the action of the spiral rod inside the pen body 1 (this is the prior art, not shown in the figure). When the dose is adjusted, the rotation of the dose knob 101 is stopped, and then the young family member adjusts the limit distance of the limit nut 3. The purpose of adjusting the limit distance of the limit nut 3 is to prevent the dose knob 101 from being excessively rotated by the elderly. During the specific adjustment, the first pinching plate 501 and the second pinching plate 502 are pinched in opposite directions. At this time, the first pinching plate 501 moves the two sliding blocks 402 and the two plug-in plates 403 forward, so that the plug-in plates 403 is separated from the rectangular plug-in slot 305, and then the first pinching plate 501 and the second pinching plate 502 are loosened. At this time, the two trapezoidal buckles 506 are engaged with the rectangular bayonet 503, and the two plug-in columns 509 are respectively plugged into the two circular plug holes 5010, so that the plug-in plate 403 is limited. Then the limit nut 3 is rotated, and the limit nut 3 moves backward under the action of the thread. When the rear end face of the limit nut 3 contacts the front end face of the limit plate 105, the limit distance of the limit nut 3 can be adjusted. At this time, the elderly can insert the needle 104 into the designated part of their body, and then push the dosage knob 101 forward to inject the insulin inside the insulin pen cartridge 103 into the subcutaneous tissue through the needle 104. At this time, the dosage knob 101 pushed forward will move forward with the connecting ring 2, the connecting plate 201, the threaded rod 202 and the limit nut 3, so that the rear end face of the limit nut 3 is separated from the front end face of the limit plate 105.

[0031] When the elderly need to set the insulin injection dose by themselves during the next insulin injection, they only need to rotate the dose knob 101 clockwise (from the back to the front). When the dose knob 101 is rotated clockwise, the dose knob 101 will move backward with the connecting ring 2, the connecting plate 201, the threaded rod 202 and the limit nut 3 under the action of the spiral rod inside the pen body 1. When the rear end surface of the limit nut 3 contacts the front end surface of the limit plate 105, the limit nut 3 can no longer move backward, and the insulin injection dose at this time is exactly the insulin injection dose of the elderly, and the elderly set the dose by themselves each time. During the process of setting the insulin injection dose, as long as the dose knob 101 feels that it can no longer be turned clockwise, it can be known that the insulin injection dose at this time has reached the preset standard value, thereby effectively avoiding the phenomenon of excessive or insufficient insulin injection dose setting value, thereby effectively improving the accuracy of the elderly in setting their own insulin injection doses, not only ensuring the therapeutic effect of insulin, but also effectively avoiding the occurrence of serious risks such as hypoglycemia due to excessive doses, greatly improving the safety of the use of this insulin injection device, and therefore this insulin injection device is more suitable for the elderly.

[0032] After the young family member has adjusted the limiting distance of the limiting nut 3, he pinches the front end of the two sliding plates 505 in opposite directions, which can move the two trapezoidal buckles 506 and the two plug-in columns 509 in opposite directions, so that the two trapezoidal buckles 506 are separated from the rectangular bayonet 503, and the two plug-in columns 509 are also pulled out from the two circular sockets 5010. At this time, the first pinching plate 501 and the two sliding blocks 402 lose their limiting effect, and then the two sliding blocks 402 move backward with the two plug-in plates 403 under the action of the external spring force of the spring guide rod 404, so that the two plug-in plates 403 are automatically inserted into the corresponding rectangular plug-in grooves 305, so that the limiting nut 3 is effectively locked and limited, avoiding the loosening of the limiting nut 3, thereby greatly improving the reliability of the limiting nut 3 during limitation.

[0033] In this article, there are several points to note: 1. The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0034] 2. In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to form new embodiments.

[0035] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An insulin injection device suitable for the elderly, comprising: The pen body (1) is provided with a dosage knob (101) at the rear end of the pen body (1); the characteristic is that the outer peripheral surface of the dosage knob (101) is provided with an annular rotation groove (106), and the annular rotation groove (106) is internally rotatably connected to a connecting ring (2), and the connecting ring (2) is provided with a connecting plate (201) on both the left and right sides, and the front end surface of the left connecting plate (201) is fixedly connected to a threaded rod (202), and the outside of the threaded rod (202) is connected to a limiting nut (3) through a threaded connection; the rear end of the left side of the outside of the pen body (1) is fixedly connected to a limiting plate (105), and the limiting plate (105) is located at the limit The limiting nut (3) is located behind the limiting nut (3); an annular connecting block (302) is provided on the inner side of the front end surface of the limiting nut (3), and the annular connecting block (302) is rotatably connected to the outside of the annular connecting plate (301); the front end surface of the annular connecting plate (301) is provided with two locking portions (4) in a bilaterally symmetrical manner; a strip-shaped sliding groove (205) is provided on the threaded rod (202), and a guide slider (304) is provided on the upper portion of the inner circumference of the annular connecting plate (301), and the guide slider (304) is slidably connected to the strip-shaped sliding groove (205); the front end surface of the limiting nut (3) is provided with rectangular plug-in grooves (305) in an annular array.

2. An insulin injection device suitable for the elderly according to claim 1, characterized in that: A cartridge holder (102) is installed at the front end of the pen body (1), an insulin cartridge (103) is installed inside the cartridge holder (102), and a needle (104) is installed at the front end of the cartridge holder (102).

3. The insulin injection device suitable for the elderly according to claim 1, characterized in that: The front end surface of the right connecting plate (201) is fixedly connected to a guide slide bar (203), and the outside of the guide slide bar (203) is slidably connected to a guide slide cylinder (204), and the guide slide cylinder (204) is fixedly connected to the right rear end of the outer peripheral surface of the pen body (1).

4. The insulin injection device suitable for the elderly according to claim 1, characterized in that: An annular connecting groove (303) is provided on the rear end surface of the annular connecting plate (301), and the annular connecting groove (303) is rotatably connected to the annular connecting block (302).

5. The insulin injection device suitable for the elderly according to claim 1, characterized in that: The locking portion (4) comprises a support frame (401), the support frame (401) being fixedly connected to the front end face of the annular connecting plate (301), and a sliding block (402) being slidably connected inside the support frame (401), a plug-in plate (403) penetrating the rear side wall of the support frame (401) being fixedly connected to the rear end face of the sliding block (402), and a spring guide rod (404) penetrating the front side wall of the support frame (401) being fixedly connected to the front end face of the sliding block (402), and a spring being sleeved on the outside of the spring guide rod (404) and located inside the support frame (401).

6. The insulin injection device suitable for the elderly according to claim 5, characterized in that: When the locking portion (4) is in the locked limit state, the plug-in plate (403) is plugged into the rectangular plug-in slot (305).

7. The insulin injection device suitable for the elderly according to claim 5, characterized in that: The upper and lower corners on the rear end surface of the plug board (403) are both chamfered.

8. The insulin injection device suitable for the elderly according to claim 5, characterized in that: The auxiliary limiting assembly (5) is also included. The auxiliary limiting assembly (5) is arranged between the two locking parts (4). The auxiliary limiting assembly (5) includes a first pinching plate (501) and a second pinching plate (502). The first pinching plate (501) is fixedly connected between the upper end surfaces of the two sliding blocks (402), and the front end surface of the first pinching plate (501) is provided with a rectangular bayonet (503); the second pinching plate (502) is fixedly connected between the front end surfaces of the two support frames (401), and the front end surface of the second pinching plate (502) is provided with a rectangular opening, and a rectangular slide tube (504) is fixedly connected in the rectangular opening, and a partition (503) is fixedly connected to the middle side of the inner portion of the rectangular slide tube (504). 7), and both left and right end surfaces of the partition (507) are fixedly connected with sliding guide rods (508), the interior of the rectangular sliding tube (504) is slidably connected to two sliding plates (505) through the sliding guide rods (508), and the two sliding plates (505) are respectively located on the left and right sides of the partition (507), and the two sliding plates (505) are distributed in a left-right symmetrical shape, each of the sliding guide rods (508) is provided with a spring on the outside, and the external spring of the sliding guide rod (508) is located between the partition (507) and the sliding plate (505), and each sliding plate (505) is provided with a trapezoidal buckle (506) at the rear end, and the width of the rear end surface of the trapezoidal buckle (506) is smaller than the width of the bottom end surface of the sliding plate (505).

9. The insulin injection device suitable for the elderly according to claim 8, characterized in that: The rear ends of the two sliding plates (505) are fixedly connected to a plug-in column (509), and a circular plug hole (5010) is provided on both the left and right side surfaces inside the rectangular bayonet (503).

10. The insulin injection device suitable for the elderly according to claim 9, characterized in that: When the auxiliary limiting assembly (5) is in the limiting state, the two trapezoidal buckles (506) are both engaged with the rectangular bayonet (503), and the two plug-in columns (509) are respectively engaged with the two circular plug holes (5010).

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