Ointment adding device for triple-energy patch

Abstract

The utility model discloses a triple-energy plaster ointment adding device which comprises a support, a medicine storage cylinder, a piston assembly, a gear and rack pushing mechanism and an operation knob, a suspension plate is arranged on the support, and a through hole is formed in the suspension plate; the medicine storage cylinder is hung in the through hole and is suitable for storing ointment, the upper end of the medicine storage cylinder is opened to form an opening, and a medicine outlet nozzle for discharging the ointment is arranged at the bottom of the medicine storage cylinder; the piston assembly comprises a piston and a push rod, the piston can be loaded into the medicine storage cylinder from the opening, and the lower end of the push rod is connected to the piston and used for pushing the piston to move up and down in the medicine storage cylinder; the gear rack pushing mechanism is arranged on the bracket, is connected with the upper end of the push rod and is used for driving the push rod to move; the operation knob is arranged on the support and connected with the gear and rack pushing mechanism and used for being operated by a user to drive the gear and rack pushing mechanism to move. According to the ointment adding device for the three-volt patch, the preparation process of the three-volt patch is improved, the working efficiency is improved, and the uniformity of the dosage of the ointment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical devices especially a three-summer plaster ointment adding device. BACKGROUND

[0002] Three-summer plaster is a kind of ointment, also a traditional Chinese medicine treatment method, preventive medicine means. Three-summer plaster therapy combines acupuncture, meridian and pharmacy, and directly pastes traditional Chinese medicine on acupoint, and generates micro-area chemical and thermal stimulation to acupoint via traditional Chinese medicine, to achieve the effect of treating and preventing diseases.

[0003] In hospital diagnosis and treatment, after doctor issues three-summer plaster therapy, medical staff pastes three-summer plaster on patients, and the specific operation is that pre-prepared ointment is stored in a container, a wooden or bamboo stick is used to shovel a certain amount of ointment from the container, and then the ointment is applied in the middle of three-summer plaster, and finally pasted on the corresponding acupoint of the patient. This operation is very inconvenient, low in efficiency, and the amount of ointment is not easy to control. UTILITARY MODEL

[0004] The utility model aims at at least one of the technical problems in the related art to some extent. Therefore, the purpose of the utility model is to provide a three-summer plaster ointment adding device.

[0005] To achieve the above-mentioned purpose, according to the three-summer plaster ointment adding device of the utility model embodiment, it comprises:

[0006] Support, the support has a suspension plate, the suspension plate is provided with a through hole penetrating in the up-down direction;

[0007] Medicine storage barrel, the medicine storage barrel is hung in the through hole and is suitable for storing ointment, the upper end of the medicine storage barrel is open to form an opening, and the bottom of the medicine storage barrel is provided with a medicine outlet for discharging ointment;

[0008] Piston assembly, the piston assembly includes a piston and a push rod, the piston can be loaded into the medicine storage barrel from the opening, and the lower end of the push rod is connected to the piston to push the piston to move up and down in the medicine storage barrel;

[0009] Gear and rack pushing mechanism, the gear and rack pushing mechanism is arranged on the support and connected with the upper end of the push rod, for driving the push rod to move;

[0010] Operation knob, the operation knob is arranged on the support and connected with the gear and rack pushing mechanism, for user operation to drive the gear and rack pushing mechanism to move.

[0011] The three-paste medicine ointment adding device provided by the embodiment of the utility model realizes fast adding of medicine ointment. The user only needs to operate the knob, which can drive the rack and pinion pushing mechanism, and then control the up and down movement of the piston in the medicine storage cylinder, so as to accurately squeeze out the required dose of medicine ointment. This design not only greatly improves the convenience and efficiency of operation, but also makes the medicine ointment dose easier to control. Compared with the traditional method of manually scooping medicine ointment with wooden or bamboo sticks, the device significantly improves the preparation process of the three-paste and improves the work efficiency of medical staff, and is also beneficial to improve the consistency of the medicine ointment dosage.

[0012] In addition, the three-paste medicine ointment adding device according to the above-mentioned embodiment of the utility model can also have the following additional technical features:

[0013] According to an embodiment of the utility model, the rack and pinion pushing mechanism comprises:

[0014] The sliding frame is slidably arranged on the support in the up and down direction, and the upper end of the push rod is connected with the sliding frame.

[0015] The rack is slidably arranged on the support in the up and down direction and is fixed opposite to the sliding frame, and the gear is pivotally arranged on the support and is engaged with the rack.

[0016] The knob is connected with the gear and can drive the gear to rotate, and the gear drives the rack and the sliding frame to move up and down.

[0017] According to an embodiment of the utility model, the support comprises a base, a back plate and a side plate, the back plate is fixed on the base and extends in the up and down direction, and the side plate is fixedly connected with the back plate and is perpendicular.

[0018] The sliding frame comprises a connecting seat, a first sliding part and a second sliding part connected to the connecting seat, the first sliding part is slidably arranged on the back plate in the up and down direction, the second sliding part is slidably arranged on the side plate in the up and down direction, the upper end of the push rod is connected to the connecting seat, and the rack is connected with the first sliding part or the second sliding part.

[0019] According to an embodiment of the utility model, the upper end of the push rod is pivotally connected to the connecting seat around an axis, and the axis is parallel to the side plate.

[0020] According to an embodiment of the utility model, the inner side of the back plate is provided with a first guide rail part, the first guide rail part is provided with a first T-shaped sliding groove, and the first sliding part is slidably matched with the first T-shaped sliding groove.

[0021] The inner side of the side plate is provided with a second guide rail part, and the second guide rail part is provided with a second T-shaped sliding groove, and the second sliding part is in sliding fit with the second T-shaped sliding groove.

[0022] According to an embodiment of the present application, the outer side of the side plate is provided with a guide groove extending in the up-down direction, and the rack is slidingly arranged in the guide groove.

[0023] The side plate is provided with a strip-shaped hole extending in the up-down direction and communicating the second T-shaped sliding groove with the guide groove, and the rack is fixedly connected with the second sliding part through a connecting piece penetrating through the strip-shaped hole.

[0024] According to an embodiment of the present application, the gear is installed on the outer side of the side plate through a bearing assembly, and the operation knob is connected with the gear through a connecting shaft.

[0025] According to an embodiment of the present application, the side plate cover is provided with a cover shell, the gear and the rack are located in the cover shell, and the operation knob is located outside the cover shell.

[0026] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0028] Fig. 1 is a structure schematic view of one perspective of the three-month paste adding device according to the embodiment of the present application;

[0029] Fig. 2 is a structure schematic view of another perspective of the three-month paste adding device according to the embodiment of the present application;

[0030] Fig. 3 is an exploded view of the three-month paste adding device according to the embodiment of the present application;

[0031] Fig. 4 is a structure schematic view of the sliding frame and the piston assembly in the three-month paste adding device according to the embodiment of the present application.

[0032] Reference signs:

[0033] 10, support;

[0034] 101, base;

[0035] 102, back plate;

[0036] 103, side plate;

[0037] 104, suspension plate;

[0038] H101, through hole;

[0039] 105, cover;

[0040] 106, first guide rail piece;

[0041] 107, second guide rail piece;

[0042] 20, medicine storage cartridge;

[0043] 30, piston assembly;

[0044] 301, piston;

[0045] 302, push rod;

[0046] 40, gear and rack pushing mechanism;

[0047] 401, sliding frame;

[0048] 4011, connecting seat;

[0049] 4012, first sliding part;

[0050] 4013, second sliding part;

[0051] 402, gear;

[0052] 403, rack;

[0053] 50, operation knob.

[0054] The realization, functional features and advantages of the utility model will be further explained in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0055] The embodiments of the utility model will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0056] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0057] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0058] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0059] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0060] The three-month paste adding device is described in detail below with reference to the drawings.

[0061] Referring to Figs. 1 to 4 As shown in the drawings, the three-month paste adding device provided by the utility model embodiment comprises a support 10, a medicine storage cylinder 20, a piston assembly 30, a gear and rack pushing mechanism 40 and an operation knob 50.

[0062] Specifically, the bracket 10 is provided with a hanging plate 104, and the hanging plate 104 is provided with a through hole H101 penetrating in the up-down direction. The bracket 10 is in an overall frame structure, is made of a metal material, and has good strength and stability. Exemplarily, the bracket 10 is provided with the hanging plate 104 in the middle part, the hanging plate 104 is in a horizontal state, and the through hole H101 penetrating in the up-down direction is arranged at the center position of the hanging plate 104.

[0063] A medicine storage cylinder 20 is hung in the through hole H101 and is adapted to store the ointment. An upper end of the medicine storage cylinder 20 is open to form an opening, and a bottom of the medicine storage cylinder 20 is provided with a medicine outlet nozzle for discharging the ointment. The medicine storage cylinder 20 can be made of transparent polycarbonate material and has good chemical resistance and visibility. In addition, a metal material such as stainless steel can also be used. The outer diameter of the medicine storage cylinder 20 is slightly smaller than the inner diameter of the through hole H101, so that the medicine storage cylinder 20 can be stably hung in the through hole H101. Preferably, the diameter of the opening at the upper end of the medicine storage cylinder 20 is the same as the inner diameter of the medicine storage cylinder 20, which is convenient for filling the ointment and inserting the piston. The medicine outlet nozzle at the bottom of the medicine storage cylinder 20 can be in a conical structure for controlling the discharge of the ointment.

[0064] The piston assembly 30 includes a piston 301 and a push rod 302. The piston 301 can be loaded into the medicine storage cylinder 20 from the opening, and the lower end of the push rod 302 is connected to the piston 301 to push the piston 301 to move up and down in the medicine storage cylinder 20. The piston 301 can be made of silica gel material, and the outer diameter of the piston 301 is slightly smaller than the inner diameter of the medicine storage cylinder 20, so that the piston 301 can slide in the medicine storage cylinder 20 while maintaining good sealing performance. The push rod 302 is made of a metal material such as stainless steel, and the lower end of the push rod 302 is connected to the center position of the piston 301 by sleeving or other connection methods.

[0065] The gear and rack pushing mechanism 40 is arranged on the bracket 10 and connected to the upper end of the push rod 302 to drive the push rod 302 to move. The operation knob 50 is arranged on the bracket 10 and connected to the gear and rack pushing mechanism 40 to be operated by the user to drive the gear and rack pushing mechanism 40 to move. When the operation knob 50 rotates one circle, the piston 301 can be pushed to descend by a predetermined distance, and a corresponding amount of ointment is discharged to achieve accurate dosing.

[0066] Before use, the operator can pre-fill the ointment into the medicine storage cylinder 20, and then hang the medicine cylinder in the through hole H101 of the bracket 10. Then, the piston 301 is inserted into the medicine storage cylinder 20 from the opening. When in use, the Sanfu patch is placed below the medicine outlet nozzle of the medicine storage cylinder 20, the operation knob 50 is rotated to drive the gear and rack pushing mechanism to move, and then the push rod 302 is pushed to move downward, so that the piston 301 descends in the medicine storage cylinder 20, the ointment is squeezed out of the medicine outlet nozzle to the Sanfu patch, and the Sanfu patch is applied with a predetermined amount of ointment.

[0067] The three-paste medicine ointment adding device provided by the embodiment of the utility model realizes fast adding of medicine ointment. The user only needs to operate the knob 50 to drive the gear and rack pushing mechanism 40, and then control the up-down movement of the piston 301 in the medicine storage cylinder 20, so as to accurately squeeze out the required dose of medicine ointment. This design not only greatly improves the convenience and efficiency of operation, but also makes the medicine ointment dose easier to control. Compared with the traditional method of manually scooping medicine ointment with a wooden or bamboo stick, the device significantly improves the preparation process of the three-paste medicine ointment, improves the work efficiency of medical staff, and is also beneficial to improving the consistency of the medicine ointment dosage.

[0068] In some embodiments of the utility model, the gear and rack pushing mechanism 40 comprises a sliding frame 401, a gear 402 and a rack 403, the sliding frame 401 is slidably arranged on the bracket 10 along the up-down direction, and the upper end of the push rod 302 is connected with the sliding frame 401.

[0069] The rack 403 is slidably arranged on the bracket 10 along the up-down direction and is fixed opposite to the sliding frame 401, and the gear 402 is pivotally arranged on the bracket 10 and is engaged with the rack 403.

[0070] The knob 50 is connected with the gear 402 and can drive the gear 402 to rotate and make the gear 402 drive the rack 403 and the sliding frame 401 to move up and down. The knob 50 can be connected with the central shaft of the gear 402 through a key connection mode to ensure synchronous rotation without relative sliding. Preferably, the outer edge of the knob 50 is marked with a scale to facilitate the operator to accurately control the squeezing amount of the medicine ointment.

[0071] In use, the operator rotates the knob 50 to drive the gear 402 to rotate. The gear 402 is engaged with the rack 403 to convert the rotary motion into linear motion and push the rack 403 to move downward. Since the rack 403 is fixedly connected with the sliding frame 401, the sliding frame 401 descends with it and drives the push rod 302 connected therewith to move downward, thereby pushing the piston 301 to descend in the medicine storage cylinder 20 and squeeze out the medicine ointment from the medicine outlet.

[0072] The gear and rack pushing mechanism 40 of the embodiment has compact structure and accurate transmission. Through the precise engagement of the gear 402 and the rack 403, the rotary motion is converted into accurate linear motion to realize accurate control of the squeezing amount of the medicine ointment. At the same time, the sliding frame 401 increases the stability of the whole mechanism to ensure the smooth and deviation-free movement of the push rod 302, improve the accuracy of the three-paste medicine ointment adding, and also improve the convenience and efficiency of operation.

[0073] In one embodiment of the present application, the bracket 10 comprises a base 101, a back plate 102 and a side plate 103. The base 101 is made of cast aluminum alloy material and is in the shape of a square flat plate, which keeps the entire bracket 10 stable. The back plate 102 is fixed on the base 101 and extends in the up-down direction, and the side plate 103 is fixedly connected with the back plate 102 and is perpendicular to the back plate 102. The back plate 102 and the side plate 103 are connected to form an L-shaped structure.

[0074] The sliding frame 401 comprises a connecting seat 4011, a first sliding part 4012 and a second sliding part 4013 connected to the connecting seat 4011. The first sliding part 4012 is slidably arranged on the back plate 102 in the up-down direction, and the second sliding part 4013 is slidably arranged on the side plate 103 in the up-down direction. The upper end of the push rod 302 is connected to the connecting seat 4011, and the rack 403 is connected to the first sliding part 4012 or the second sliding part 4013.

[0075] In use, the operator rotates the operation knob 50 to drive the gear 402 to rotate. The gear 402 is engaged with the rack 403, which drives the rack 403 to move up and down. Since the rack 403 is fixed on the first sliding part 4012 or the second sliding part 4013, the entire sliding frame 401 slides smoothly on the back plate 102 and the side plate 103. The sliding frame 401 drives the push rod 302 to move up and down through the connecting seat 4011, thereby achieving precise control of the piston 301 in the medicine cartridge 20.

[0076] The bracket 10 and the sliding frame 401 of the present embodiment are designed with full consideration of structural stability and movement accuracy. The base 101, the back plate 102 and the side plate 103 constitute a three-point support structure design, which provides overall rigidity and structural strength. The double-axis sliding design of the first sliding part 4012 and the second sliding part 4013 ensures the smoothness and accuracy of the movement of the sliding frame 401, effectively preventing lateral deviation and shaking. This design not only improves the accuracy of the three-heat plaster ointment adding, but also greatly enhances the reliability and durability of the entire device, providing a guarantee for long-term stable use.

[0077] In one embodiment of the present application, the upper end of the push rod 302 is pivotally connected to the connecting seat 4011 about an axis line, and the axis line is parallel to the side plate 103.

[0078] In the embodiment, the upper end of the push rod 302 is pivotally connected with the connecting seat 4011, and the pivot connection allows the push rod 302 to be slightly adjusted in angle during movement, so as to adapt to the slight inclination or misalignment of the medicine cartridge 20. On the other hand, when the medicine cartridge 20 needs to be taken out, the push rod 302 is slid upward, so that the piston 301 is out of the medicine cartridge 20, at this time, the push rod 302 is rotated, so that the piston 301 and the push rod 302 are rotated to a horizontal state, so that the space above the suspension plate 104 is wide and is not interfered by the piston 301 and the push rod 302, thereby facilitating the taking out of the medicine cartridge 20 and improving the convenience and flexibility of use.

[0079] In an embodiment of the utility model, the inner side of back plate 102 is equipped with first guide rail 106, first guide rail 106 is equipped with first T type sliding slot, first sliding part 4012 and first T type sliding slot sliding fit.

[0080] The inner side of side plate 103 is equipped with second guide rail 107, and the second guide rail 107 is equipped with a second T-shaped sliding groove, and the second sliding part 4013 is slidably connected with the second T-shaped sliding groove.

[0081] During installation, the first sliding part 4012 is slid into the upper end of the first T-shaped sliding groove, and the second sliding part 4013 is slid into the upper end of the second T-shaped sliding groove.

[0082] In the embodiment, the first guide rail 106, the second guide rail 107 and the first sliding part 4012, the second sliding part 4013 are slidably connected, which ensures that the sliding frame 401 slides smoothly and reliably. Moreover, the T-shaped structure of the first sliding part 4012 and the second sliding part 4013 provides load-carrying capacity and torsional resistance, ensuring the stability and accuracy of sliding. In addition, the modular design can be individually disassembled and replaced, which is convenient for daily maintenance and cleaning.

[0083] In an embodiment of the utility model, the outer side of the side plate 103 is provided with a guide groove extending in the up-down direction, and the rack 403 is slidably arranged in the guide groove.

[0084] The side plate 103 is provided with a strip-shaped hole extending in the up-down direction and communicating the second T-shaped sliding groove with the guide groove, and the rack 403 is fixedly connected with the second sliding part 4013 through a connecting piece penetrating the strip-shaped hole.

[0085] In the installation, first, the first sliding part 4012, the second sliding part 4013 of the sliding frame 401 are slidably assembled with the first guide rail 106, the second guide rail 107, then the rack 403 is installed in the guide groove, and is fixed with the second sliding part 4013 through a bolt or the like connecting piece, and the teeth on the rack 403 and the teeth on the gear 402 are kept in engagement. In this way, when the operation knob 50 is rotated, the gear 402 drives the rack 403 to slide up and down, and the rack 403 can drive the sliding frame 401 to move up and down.

[0086] In the embodiment, the gear 402 and the rack 403 are installed on the outer side of the side plate 103, so that the space on the inner side of the side plate 103 is not occupied, and the sliding frame 401 can slide up and down smoothly and has a larger stroke. In addition, the reliability of the structure is improved.

[0087] In an embodiment of the utility model, the gear 402 is installed on the outer side of the side plate 103 through a bearing assembly, and the operation knob 50 is connected with the gear 402 through a connecting shaft. In this way, the user can directly operate and rotate the operation knob 50 on the outer side by using the hand during use, and the use is more convenient.

[0088] In an embodiment of the utility model, the side plate 103 is covered with a cover 105, the gear 402 and the rack 403 are located in the cover 105, and the operation knob 50 is located outside the cover 105. In this way, not only is the appearance of the device more simple and compact, but also the gear 402 and the rack 403 are hidden in the cover 105, so that the use is safer and more reliable.

[0089] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0090] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A Sanfu paste adding device, characterized in that, The application relates to a medicine storage device, which comprises a bracket, a medicine storage cartridge, a piston assembly, a rack and pinion pushing mechanism and an operation knob. The bracket is provided with a hanging plate, and the hanging plate is provided with a through hole penetrating in the up-down direction. The medicine storage cartridge is hung in the through hole and is adapted to store medicine cream. The upper end of the piston assembly is connected to the piston. The rack and pinion pushing mechanism is arranged on the bracket and is connected to the upper end of the push rod. The operation knob is arranged on the bracket and is connected to the rack and pinion pushing mechanism.

2. The Sanfu Paste Adder of claim 1, wherein, The rack and pinion pushing mechanism comprises a sliding frame, a rack and a pinion. The sliding frame is slidably arranged on the bracket in the up-down direction. The rack is slidably arranged on the bracket in the up-down direction and is fixedly connected to the sliding frame. The pinion is pivotally arranged on the bracket and is engaged with the rack.

3. The Sanfu Paste Additive Device according to claim 2, characterized in that, The operation knob is connected to the pinion and can drive the pinion to rotate and drive the rack and the sliding frame to move up and down. The bracket comprises a base, a back plate and a side plate.

4. The Sanfu Paste Adder of claim 3, wherein, The back plate is fixed on the base and extends in the up-down direction.

5. The Sanfu Paste Additive Device according to claim 3, wherein, The side plate is fixedly connected to the back plate and is perpendicular. The sliding frame comprises a connecting seat, a first sliding part and a second sliding part.

6. The Sanfu Paste Additive Device according to claim 5, characterized in that, The first sliding part is slidably arranged on the back plate in the up-down direction. The second sliding part is slidably arranged on the side plate in the up-down direction.

7. The Sanfu Paste Additive Device according to claim 6, wherein, The upper end of the push rod is pivotally connected to the connecting seat.

8. The Sanfu Paste Additive Device according to claim 6, wherein, The inner side of the back plate is provided with a first guide rail. The first guide rail is provided with a first T-shaped sliding groove. The first sliding part is slidably matched with the first T-shaped sliding groove. The inner side of the side plate is provided with a second guide rail. The second guide rail is provided with a second T-shaped sliding groove. The second sliding part is slidably matched with the second T-shaped sliding groove. The outer side of the side plate is provided with a guide groove extending in the up-down direction. The rack is slidably arranged in the guide groove. The side plate is provided with a strip-shaped hole. The strip-shaped hole extends in the up-down direction and communicates the second T-shaped sliding groove with the guide groove. The rack is fixedly connected to the second sliding part through a connecting piece penetrating through the strip-shaped hole. The pinion is installed on the outer side of the side plate through a bearing assembly. The operation knob is connected to the pinion through a connecting shaft. The side plate cover is provided with a cover shell. The pinion and the rack are located in the cover shell. The operation knob is located outside the cover shell.

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