Tablet divider

Abstract

The utility model provides a tablet divider which comprises a tablet placing platform used for horizontally placing tablets to be divided; the cutting knife is positioned above the medicine placing platform and is used for cutting the tablets on the medicine placing platform; the first driving mechanism is connected with the cutting knife to drive the cutting knife to vertically move up and down above the medicine placing platform so as to be close to or far away from the medicine placing platform; the second driving mechanism is connected with the cutting knife to drive the cutting knife to horizontally reciprocate so as to drive the cutting knife to cut the tablets on the tablet placing platform back and forth, so that the situation that the tablets are cut off directly and vertically by one knife and are not easy to cut up is avoided; the technical problems that in the prior art, a cutting knife adopted by a tablet cutter cuts off tablets at a time through vertical force, the tablets are prone to being cut up, medicine scraps are generated, medicine waste is caused, and the dosage is affected are effectively solved, and the technical effects that cutting is accurate, medicine scraps are not prone to being generated, and use is convenient and easy are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a tablet splitter. Background Art

[0002] A pill splitter is a tool that can split pills into several smaller portions for multiple doses.

[0003] Patent CN219185000U discloses a tablet splitter, which includes a storage box, a storage box hinged at the bottom of the storage box for storing a cutting knife, a cutting box hinged at the top of the storage box, a sealing box hinged at the top of the cutting box, tablets stored in the inner cavity of the storage box, a fixing groove provided at the bottom of the inner cavity of the cutting box, a lifting assembly provided at the top of the inner cavity of the sealing box, a screw rod screwed at the bottom of the lifting assembly, a connecting plate fixedly installed at the bottom of the screw rod, and a cutting knife provided at the bottom of the connecting plate. The tablet splitter can make the lifting plate push the screw rod, the connecting plate and the cutting knife to slide downward along a straight line under the limiting action of multiple telescopic rods through the setting of the lifting assembly, so as to split the tablets placed in the inner cavity of the fixing groove, thereby achieving the purpose of tablet splitting.

[0004] However, the cutting knife used in the tablet splitter cuts the tablets with one cut through vertical force. If it encounters a hard medicine, it is easy to break the tablets, produce medicine crumbs and residues, and cause medicine waste. Utility Model Content

[0005] The embodiment of the present application provides a tablet splitter, which solves the technical problem that the cutting knife used in the tablet splitter in the prior art cuts the tablet with a vertical force, which easily breaks the tablet and produces drug crumbs and residues, thereby causing drug waste and affecting the dosage.

[0006] In order to solve the above technical problems, the present application provides a tablet splitter, which comprises:

[0007] A medicine placing platform, used for placing the tablets to be divided flatly;

[0008] A cutting knife, located above the medicine placing platform, for cutting the tablets on the medicine placing platform;

[0009] A first driving mechanism is connected to the cutting knife to drive the cutting knife to move vertically up and down above the medicine placement platform to approach or move away from the medicine placement platform;

[0010] The second driving mechanism is connected to the cutting knife to drive the cutting knife to move horizontally back and forth, thereby driving the cutting knife to cut the tablets on the medicine placing platform back and forth.

[0011] Furthermore, the tablet splitter includes a shell, which includes an upper shell and a lower shell that are interlocked to form an inner cavity, the medicine placing platform, the cutting knife, the first driving mechanism and the second driving mechanism are all arranged in the inner cavity, and the medicine placing platform is located in the lower shell, and the cutting knife, the first driving mechanism and the second driving mechanism are located in the upper shell.

[0012] Furthermore, the lower shell is provided with a window for placing or taking out tablets on the medicine placing platform.

[0013] Furthermore, the first driving mechanism comprises:

[0014] A connecting piece, fixedly connected to the cutting knife;

[0015] A threaded sleeve, fixedly arranged at both ends of the connecting piece, and the threaded sleeve penetrates in a vertical direction, and the threaded sleeve is provided with an internal thread extending spirally in the vertical direction;

[0016] A first screw rod is vertically inserted into the threaded sleeve and is threadably engaged with the threaded sleeve;

[0017] The first motor has an output shaft coaxially connected to the first screw rod to drive the first screw rod to rotate, thereby driving the threaded sleeve to move up and down in the vertical direction, thereby driving the cutting knife on the connecting member to move up and down.

[0018] Furthermore, the first driving mechanism further includes a first auxiliary mechanism for assisting the threaded sleeve to move smoothly, and the first auxiliary mechanism includes:

[0019] A first sliding rod is parallel to the first screw rod, and the first sliding rod is fixedly arranged on one side of the first screw rod;

[0020] The slider is slidably arranged on the first slider rod, and the slider is fixedly connected to the threaded sleeve.

[0021] Furthermore, the second driving mechanism comprises:

[0022] A frame body, fixedly connected to the connecting member;

[0023] A second screw rod is rotatably disposed on the frame body, and the second screw rod extends in a horizontal direction;

[0024] A sliding seat, sleeved on the second screw rod and threadably engaged with the threaded sleeve;

[0025] The second motor has an output shaft coaxially connected to the second screw to drive the second screw to rotate, thereby driving the sliding seat to reciprocate in the horizontal direction, thereby driving the cutting knife to cut the tablets on the medicine placement platform back and forth.

[0026] Furthermore, the second driving mechanism also includes a second sliding rod for assisting the sliding seat to move smoothly, the two ends of the second sliding rod are fixedly arranged on the sliding seat, and the second sliding rod is arranged parallel to and spaced from the second screw rod, and the sliding seat can be slidably passed through the second sliding rod.

[0027] Furthermore, the upper shell and the lower shell are fixed by a detachable locking member, and the locking member includes:

[0028] A first tenon is arranged on the outer wall surface of the opening of the upper shell;

[0029] A second tenon is arranged on the outer wall surface of the opening of the lower shell;

[0030] The mortise and tenon has a tenon groove. When the upper shell and the lower shell are buckled together, the second tenon and the first tenon are close together. The tenon groove of the mortise and tenon bites the second tenon and the first tenon close together and presses them together to lock the upper shell and the lower shell together.

[0031] Furthermore, the locking member also includes a reinforcing pin, and the reinforcing pin is inserted into the mortise, the first tenon and the second tenon, so as to connect the mortise, the first tenon and the second tenon together.

[0032] Furthermore, the locking member further comprises a positioning component, and the positioning component comprises:

[0033] An upper positioning column, arranged on the first tenon;

[0034] A lower positioning column, arranged on the second tenon;

[0035] A first positioning groove, corresponding to the upper positioning column, is arranged on the groove wall of the tenon groove;

[0036] A second positioning groove, corresponding to the lower positioning column, is arranged on the groove wall of the tenon groove;

[0037] Wherein, when the tenon and the tenon groove engage with the second tenon and the first tenon which are close to each other, the upper positioning column is positioned in the first positioning groove, and the lower positioning column is positioned in the second positioning groove.

[0038] Compared with the prior art, the tablet splitter described in the embodiment of the present application drives the cutting knife to move closer to or away from the tablets placed flat on the medicine placing platform by setting a first driving mechanism, and drives the cutting knife to move back and forth horizontally by setting a second driving mechanism, thereby driving the cutting knife to cut the tablets on the medicine placing platform back and forth, avoiding directly cutting the tablets with a vertical knife, and making it difficult to cut the tablets into pieces. This effectively solves the technical problem that the cutting knife used in the tablet splitter in the prior art cuts the tablets with a vertical force, which is easy to cut the tablets into pieces and produce medicine crumbs and residues, thereby causing medicine waste and affecting the amount of medicine used, and achieves the technical effects of accurate segmentation, not easy to produce medicine crumbs, and convenience and ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in 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.

[0040] Figure 1 This is a cross-sectional schematic diagram of a tablet splitter in one embodiment of the utility model;

[0041] Figure 2 It is a top view of the partial structure of a tablet splitter in one embodiment of the utility model;

[0042] Figure 3 for Figure 1 A schematic diagram of the structure enlargement in the middle;

[0043] Figure 4 for Figure 1 Enlarged schematic diagram of the structure at point B in the middle. DETAILED DESCRIPTION

[0044] The embodiment of the present application provides a tablet splitter, which solves the technical problem that the cutting knife used in the tablet splitter in the prior art cuts the tablet with a vertical force, which easily breaks the tablet and produces drug crumbs and residues, thereby causing drug waste and affecting the dosage.

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] One or more embodiments of the present application provide a tablet splitter for cutting a tablet 4 into several small portions for multiple doses. Of course, in other embodiments, the tablet splitter 4 can also be used to cut other items, which is not limited here.

[0047] like Figure 1 , 2 As shown, an embodiment of the present application provides a tablet splitter, the tablet splitter comprising:

[0048] A medicine placing platform 218, for placing the tablets 4 to be divided flatly;

[0049] A cutting knife 217, located above the medicine placing platform 218, for cutting the tablets 4 placed flat on the medicine placing platform 218;

[0050] A first driving mechanism 1, connected to the cutting knife 217, to drive the cutting knife 217 to move vertically up and down above the medicine placement platform 218, so as to approach or move away from the medicine placement platform 218;

[0051] The second driving mechanism 2 is connected to the cutting knife 217 to drive the cutting knife 217 to move horizontally back and forth, thereby driving the cutting knife 217 to cut the tablets 4 on the medicine placement platform 218 back and forth.

[0052] From the above description, it can be known that a tablet splitter described in an embodiment of the present application drives the cutting knife 217 to approach or move away from the tablet 4 placed flat on the medicine placing platform 218 by setting a first driving mechanism 1, and drives the cutting knife 217 to move back and forth horizontally by setting a second driving mechanism 2, thereby driving the cutting knife 217 to cut the tablet 4 on the medicine placing platform 218 back and forth, avoiding directly cutting the tablet 4 with a vertical knife, and making it difficult to chop the tablet 4 into pieces. This effectively solves the technical problem that the cutting knife 217 used in the tablet 4 splitter in the prior art cuts the tablet 4 with a vertical force, which is easy to chop the tablet 4 into pieces and produces medicine crumbs and residues, thereby causing waste of medicine and affecting the amount of medicine used, and achieves the technical effects of accurate segmentation, not easy to produce medicine crumbs, and convenience and ease of use.

[0053] However, it should be noted that, in the various embodiments of the present application, if terms indicating orientation or positional relationship such as "inside", "outside", "top", "bottom", "up", "down", "high", and "low" appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] In one embodiment of the present application, Figure 1As shown, the tablet splitter includes a shell, which includes an upper shell 112 and a lower shell 111 that are buckled together to form an inner cavity, and the medicine placing platform 218, the cutting knife 217, the first driving mechanism 1 and the second driving mechanism 2 are all arranged in the inner cavity, and the medicine placing platform 218 is located in the lower shell 111, and the cutting knife 217, the first driving mechanism 1, and the second driving mechanism 2 are located in the upper shell 112.

[0055] In one embodiment of the present application, Figure 1 As shown, the lower shell 111 is provided with a window 113 for placing or taking out the tablets 4 on the medicine placing platform 218 .

[0056] Specifically, the medicine placement platform 218 is connected to the window 113, so the tablets 4 can be placed or taken out through the window 113, which is very convenient. For example, the medicine placement platform can be cylindrical.

[0057] In one embodiment of the present application, Figure 1 , 3 As shown, the first driving mechanism 1 comprises:

[0058] A connecting member 213, fixedly connected to the cutting knife 217;

[0059] The threaded sleeve 212 is fixedly arranged at both ends of the connecting member 213, and the threaded sleeve 212 is penetrated in the vertical direction, and the threaded sleeve 212 is provided with an internal thread extending spirally in the vertical direction;

[0060] The first screw rod 211 is vertically inserted into the threaded sleeve 212 and is threadedly engaged with the threaded sleeve 212;

[0061] The first motor has an output shaft coaxially connected to the first screw rod 211 to drive the first screw rod 211 to rotate, thereby driving the threaded sleeve 212 to move up and down in the vertical direction, thereby driving the cutting knife 217 on the connecting member 213 to move up and down.

[0062] Specifically, the output shaft of the first motor rotates, which will synchronously drive the first screw 211 to rotate. The first screw 211 will drive the threaded sleeve 212 meshing therewith to move up and down in the vertical direction, converting the rotation of the first screw 211 into the linear motion of the threaded sleeve 212, thereby driving the connecting member 213 to move up and down, so as to drive the cutting knife 217 to approach or move away from the medicine placement platform 218. After placing the tablet 4 flat on the medicine placement platform 218, the cutting knife 217 is driven to approach the medicine placement platform 218 to contact the tablet 4, thereby cutting the tablet 4; after the tablet 4 is cut, the cutting knife 217 is driven away from the medicine placement platform 218, so as to safely remove the cut tablet 4.

[0063] In one embodiment of the present application, Figure 1 , 3 As shown, the first driving mechanism 1 further includes a first auxiliary mechanism for assisting the threaded sleeve 212 to move smoothly, and the first auxiliary mechanism includes:

[0064] A first sliding rod 221 is parallel to the first screw rod 211, and the first sliding rod 221 is fixedly disposed on one side of the first screw rod 211;

[0065] The slider 220 is slidably disposed on the first slider rod 221 , and the slider 220 is fixedly connected to the threaded sleeve 212 .

[0066] Specifically, the slider 220 moves synchronously with the threaded sleeve 212 in a straight line, which can make the straight line movement of the threaded sleeve 212 more stable and smooth, thereby ensuring that the cutting knife 217 stably approaches or moves away from the tablet 4 on the medicine placement platform 218, thereby improving the effectiveness and stability of the divider.

[0067] In addition, the first slide bar 221 is fixed to the inner wall of the upper shell 112, and the top ends of the first slide bars 221 on both sides are connected by a connecting rod 223 to improve the balance of the first auxiliary mechanisms on both sides, thereby ensuring that the cutting knife 217 moves up and down smoothly.

[0068] In one embodiment of the present application, Figure 1 As shown, the second driving mechanism 2 includes:

[0069] The frame 214 is fixedly connected to the connecting member 213;

[0070] A second screw rod 215 is rotatably disposed on the frame 214, and the second screw rod 215 extends in a horizontal direction;

[0071] A sliding seat 216 is sleeved on the second screw rod 215 and threadedly engaged with the threaded sleeve 212;

[0072] The output shaft of the second motor 113 is coaxially connected to the second screw 215 to drive the second screw 215 to rotate, thereby driving the sliding seat 216 to reciprocate in the horizontal direction, thereby driving the cutting knife 217 to cut the tablets 4 on the medicine placement platform 218 back and forth.

[0073] Specifically, the rotation of the output shaft of the second motor 113 will synchronously drive the second screw 215 to rotate, and the second screw 215 will drive the sliding seat 216 meshing therewith to reciprocate in the horizontal direction, converting the rotation of the second screw 215 into a linear motion of the sliding seat 216, thereby driving the sliding seat 216 to reciprocate horizontally, so as to drive the cutting knife 217 to cut the tablets 4 on the medicine placing platform 218 back and forth.

[0074] Furthermore, the frame 214 includes a bottom plate and vertical plates vertically arranged at both ends of the bottom plate, and first through holes are oppositely opened on the two vertical plates, and both ends of the second screw rod 215 can be rotatably inserted into the first through holes at both ends.

[0075] In one embodiment of the present application, Figure 1 As shown, the second driving mechanism 2 also includes a second sliding rod 222 for assisting the sliding seat 216 to move smoothly. Both ends of the second sliding rod 222 are fixedly arranged on the sliding seat 216, and the second sliding rod 222 is arranged parallel to and spaced from the second screw rod 215. The sliding seat 216 can be slidably penetrated through the second sliding rod 222.

[0076] Specifically, the sliding seat 216 slides along the second screw rod 215 and the two sliding rods at the same time, which can make the linear movement of the sliding seat 216 more stable and smooth, thereby ensuring that the cutting knife 217 cuts the tablets 4 on the medicine placement platform 218 back and forth more steadily and smoothly.

[0077] Furthermore, second through holes are formed on the two vertical plates opposite to each other, and the second through holes are located below the first through holes, and two ends of the second sliding rod 222 are fixedly inserted into the second through holes at the two ends.

[0078] In one embodiment of the present application, Figure 1 , 4 As shown, the upper shell 112 and the lower shell 111 are fixed by a detachable locking member 3, and the locking member 3 includes:

[0079] A first tenon 312 is disposed on the outer wall surface of the opening of the upper shell 112;

[0080] The second tenon 311 is arranged on the outer wall surface of the opening of the lower shell 111;

[0081] The mortise and tenon 313 has a tenon groove. When the upper shell 112 and the lower shell 111 are buckled together, the second tenon 311 and the first tenon 312 are close together, and the tenon groove of the mortise and tenon 313 bites into the second tenon 311 and the first tenon 312 that are close together and presses them together to lock the upper shell 112 and the lower shell 111 together.

[0082] In one embodiment of the present application, Figure 1 , 4 As shown, the locking member 3 further includes a reinforcing pin 314, and the reinforcing pin 314 is inserted into the mortise 313, the first tenon 312 and the second tenon 311, so as to connect the mortise 313, the first tenon 312 and the second tenon 311 together.

[0083] Specifically, by providing the reinforcing pin 314 , the connection strength between the mortise 313 and the first tenon 312 and the second tenon 311 is further strengthened to prevent the mortise 313 from being separated from the first tenon 312 and the second tenon 311 .

[0084] In one embodiment of the present application, Figure 1 , 4 As shown, the locking member 3 further includes a positioning component, and the positioning component includes:

[0085] An upper positioning column 315 is disposed on the first tenon 312;

[0086] A lower positioning column, disposed on the second tenon;

[0087] A first positioning groove 316, corresponding to the upper positioning column 315, is arranged on the groove wall of the tenon groove;

[0088] A second positioning groove, corresponding to the lower positioning column, is arranged on the groove wall of the tenon groove;

[0089] When the tenon and the groove engage with the second tenon 311 and the first tenon 312 which are close to each other, the upper positioning column is positioned in the first positioning groove 316, and the lower positioning column is positioned in the second positioning groove.

[0090] Specifically, by providing the positioning component, the connection strength between the mortise 313 and the first tenon 312 and the second tenon 311 is further strengthened to prevent the mortise 313 from being separated from the first tenon 312 and the second tenon 311 .

[0091] An exemplary method of using a tablet splitter provided in an embodiment of the present application is as follows:

[0092] S1, placing the tablet 4 to be divided flat on the medicine placing platform 218;

[0093] S2, start the first driving mechanism 1, so that the first driving mechanism drives the cutting knife 217 to move downward and contact the tablet 4; start the second driving mechanism 2, so that the second driving mechanism drives the cutting knife 217 to move horizontally back and forth, so as to cut the tablet 4 back and forth along the first cutting path 225, until the tablet 4 is split into two halves along this direction;

[0094] S3, turning on the second driving mechanism 2, so that the second driving mechanism drives the cutting knife 217 to move upward to separate from the tablet 4, manually rotating the tablet 4, and aligning the second cutting path 219 with the blade of the cutting knife 217;

[0095] S4, repeat the above steps S2 and S3 until the tablet 4 is cut into a predetermined number of portions.

[0096] It should be understood that although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit without departing from the scope of the exemplary embodiments.

[0097] The directional terms such as outer, middle, inner, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0098] The above is only a preferred embodiment of the present application, and is not any formal or substantial limitation to the present application. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present application, and these improvements and supplements should also be regarded as the protection scope of the present utility model. Any technician familiar with this profession can make some changes, modifications and evolutions of the technical content disclosed above without departing from the spirit and scope of the present application, which are equivalent embodiments of the present application; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the substantial technology of the present application are still within the scope of the technical solution of the present application.

Claims

1. A tablet splitter, characterized in that: The tablet splitter comprises: A medicine placing platform, used for placing the tablets to be divided flatly; A cutting knife, located above the medicine placing platform, for cutting the tablets on the medicine placing platform; A first driving mechanism is connected to the cutting knife to drive the cutting knife to move vertically up and down above the medicine placement platform to approach or move away from the medicine placement platform; A second driving mechanism is connected to the cutting knife to drive the cutting knife to move horizontally back and forth, thereby driving the cutting knife to cut the tablets on the medicine placing platform back and forth; The tablet splitter comprises a shell, the shell comprises an upper shell and a lower shell which are buckled together to form an inner cavity, the medicine placement platform, the cutting knife, the first driving mechanism and the second driving mechanism are all arranged in the inner cavity, and the medicine placement platform is located in the lower shell, and the cutting knife, the first driving mechanism and the second driving mechanism are located in the upper shell; The lower shell is provided with a window for placing or taking out tablets on the medicine placing platform.

2. A tablet splitter as claimed in claim 1, characterized in that: The first driving mechanism comprises: A connecting piece, fixedly connected to the cutting knife; A threaded sleeve, fixedly arranged at both ends of the connecting piece, and the threaded sleeve penetrates in a vertical direction, and the threaded sleeve is provided with an internal thread extending spirally in the vertical direction; A first screw rod is vertically inserted into the threaded sleeve and is threadably engaged with the threaded sleeve; The first motor has an output shaft coaxially connected to the first screw rod to drive the first screw rod to rotate, thereby driving the threaded sleeve to move up and down in the vertical direction, thereby driving the cutting knife on the connecting member to move up and down.

3. A tablet splitter as claimed in claim 2, characterized in that: The first driving mechanism further includes a first auxiliary mechanism for assisting the threaded sleeve to move smoothly, and the first auxiliary mechanism includes: A first sliding rod is parallel to the first screw rod, and the first sliding rod is fixedly arranged on one side of the first screw rod; The slider is slidably arranged on the first slider rod, and the slider is fixedly connected to the threaded sleeve.

4. A tablet splitter as claimed in claim 3, characterized in that: The second driving mechanism comprises: A frame body, fixedly connected to the connecting member; A second screw rod is rotatably disposed on the frame body, and the second screw rod extends in a horizontal direction; A sliding seat, sleeved on the second screw rod and threadably engaged with the threaded sleeve; The second motor has an output shaft coaxially connected to the second screw to drive the second screw to rotate, thereby driving the sliding seat to reciprocate in the horizontal direction, thereby driving the cutting knife to cut the tablets on the medicine placement platform back and forth.

5. A tablet splitter as claimed in claim 4, characterized in that: The second driving mechanism also includes a second sliding rod for assisting the sliding seat to move smoothly. Both ends of the second sliding rod are fixedly arranged on the sliding seat, and the second sliding rod is arranged parallel to and spaced from the second screw rod. The sliding seat can be slidably penetrated on the second sliding rod.

6. A tablet splitter as claimed in claim 1, characterized in that: The upper shell and the lower shell are fixed by a detachable locking member, and the locking member includes: A first tenon is arranged on the outer wall surface of the opening of the upper shell; A second tenon is arranged on the outer wall surface of the opening of the lower shell; The mortise and tenon has a tenon groove. When the upper shell and the lower shell are buckled together, the second tenon and the first tenon are close together. The tenon groove of the mortise and tenon bites the second tenon and the first tenon close together and presses them together to lock the upper shell and the lower shell together.

7. A tablet splitter as claimed in claim 6, characterized in that: The locking member further includes a reinforcing pin, which is inserted into the mortise, the first tenon, and the second tenon, thereby connecting the mortise, the first tenon, and the second tenon together.

8. A tablet splitter as claimed in claim 7, characterized in that: The locking member further comprises a positioning component, and the positioning component comprises: An upper positioning column, arranged on the first tenon; A lower positioning column, disposed on the second tenon; A first positioning groove, corresponding to the upper positioning column, is arranged on the groove wall of the tenon groove; A second positioning groove, corresponding to the lower positioning column, is arranged on the groove wall of the tenon groove; Wherein, when the tenon and the tenon groove engage with the second tenon and the first tenon which are close to each other, the upper positioning column is positioned in the first positioning groove, and the lower positioning column is positioned in the second positioning groove.

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