Damper assembly with shell

Abstract

The damper assembly with the shell comprises a damper and the shell, the damper is provided with a stainless steel shell body, the upper end of the damper is provided with a head portion with a flat structure, the shell is provided with a containing cavity for the stainless steel shell body to be inserted, and an anti-skidding step is integrally formed on the outer surface of the shell. The step is provided with a plurality of anti-skid convex parts which protrude outwards; a guide limiting lock arm capable of generating elastic deformation is further formed outside the outer shell, and the stainless steel shell of the damper is fixedly inserted into the containing cavity of the outer shell. The volume of the whole product is increased by additionally arranging the shell, so that a user can hold, install and use the product conveniently; when the oil-free damper assembly is used, a user directly holds the oil-free shell with a hand, the oil-free shell makes contact with the multiple anti-skid protruding parts on the step, the anti-skid purpose can be achieved, force operation can be better achieved, and the damper assembly is easy to assemble and disassemble when used; and through guiding and locking of the guiding and limiting locking arm, smooth assembly with a workpiece can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to damper product technical field, especially a damper assembly with a shell. BACKGROUND

[0002] Dampers are widely used in life, such as: flip covers, hinges, doors and windows, etc. Through the resistance effect of the damper, it can have resistance in at least one direction of rotation, can eliminate the corresponding mechanical force or external force, and improve the service life of products such as toilet cover plates, hinges, doors and windows, etc. It can also avoid the opening and closing of cover plates, doors and windows with large force, and avoid causing large noise or causing damage.

[0003] The dampers on the market generally use stainless steel shells and do not have a designed shell for use, so that the entire damper is small in size and difficult to assemble. The lower part of the stainless steel shell is smooth and has no boss or rough gripping surface. The stainless steel shell usually has residual smooth grease (stainless steel shells after stamping processing usually have residual rust-proof oil), which is difficult to hold and disassemble by hand, causing great inconvenience to the user. The heavy torque one-way rotation damper disclosed in CN214118829U has the above disadvantages.

[0004] In addition, when installing the heavy torque one-way rotation damper, the upper end of the heavy torque one-way rotation damper is inserted into the installation position of the workpiece (such as a cover plate) with a flat head. Since there is no guide limit on the outside of the heavy torque one-way rotation damper, and the size of the head is smaller than the size of the shell, it is difficult to insert the flat head during installation, resulting in low installation efficiency or installation difficulty.

[0005] Therefore, the present inventors have proposed the following technical solution. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the defects of the prior art, and provides a damper assembly with a shell.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: the damper assembly with a shell comprises a damper, the damper has a stainless steel shell, and the upper end of the damper has a head with a flat structure. The damper assembly further comprises a shell, the shell has a receiving cavity for inserting the stainless steel shell, and the outer surface of the shell is integrally formed with a step for preventing slipping, and the step has a plurality of outwardly protruding anti-slip protrusions. The outer surface of the shell is further formed with a guide limit lock arm that can be elastically deformed. The stainless steel shell of the damper is inserted and fixed in the receiving cavity of the shell.

[0008] Further, in the above technical solution, the lower part of the stainless steel shell is provided with at least one limiting plane, and the accommodating cavity is formed with a limiting convex rib matched with the limiting plane.

[0009] Further, in the above technical solution, the lower part of the stainless steel shell is provided with two symmetrically distributed limiting planes.

[0010] Further, in the above technical solution, the upper end of the limiting convex rib is formed with a guide inclined surface.

[0011] Further, in the above technical solution, the limiting convex rib is provided with an exhaust groove extending along the length direction of the shell, and the bottom of the shell is provided with a hole penetrating the accommodating cavity; after the limiting convex rib is matched with the limiting plane, the exhaust grooves form an exhaust passage.

[0012] Further, in the above technical solution, the lower end of the guide limiting lock arm is integrally formed with an outwardly protruding stop block.

[0013] Further, in the above technical solution, the outer part of the shell is provided with a hole in the shape of an inverted U to form the guide limiting lock arm, the upper end of the guide limiting lock arm is formed with a lock catch, the upper end of the lock catch is provided with an inclined guide surface, and the inner side of the guide limiting lock arm is thinned, so that the inner side of the guide limiting lock arm is lower than the inner side of the shell, so that the inner side of the guide limiting lock arm and the outer wall of the stainless steel shell form a space for elastic deformation of the guide limiting lock arm.

[0014] Further, in the above technical solution, the damper comprises the stainless steel shell, a guide column mounted in the stainless steel shell, a lower rotary-to-linear motion seat which is movably up and down and rotatably mounted on the guide column, a spring mounted in the stainless steel shell and pressing the lower rotary-to-linear motion seat from bottom to top, an oil sealing block mounted on the periphery of the lower rotary-to-linear motion seat and in sealing contact with the inner wall of the stainless steel shell, an upper rotary-to-linear motion seat rotatably mounted on the stainless steel shell, movably up and down and cooperatively mounted with the lower rotary-to-linear motion seat and sleeved on the upper end of the guide column, a sealing ring sleeved on the outer part of the upper rotary-to-linear motion seat and in sealing contact with the inner wall of the stainless steel shell, and a limiting sheet for limiting the upper rotary-to-linear motion seat on the upper end of the stainless steel shell; after the lower end of the lower rotary-to-linear motion seat cooperatively contacts with the oil sealing block, a sealing chamber is formed between the lower end of the lower rotary-to-linear motion seat and the inner cavity of the stainless steel shell, and damping grease is injected into the sealing chamber; the upper end of the upper rotary-to-linear motion seat has the head.

[0015] Further, in the above technical solution, the lower rotary-to-linear motion seat is provided with a lower rotary slope at the upper end, and the upper rotary-to-linear motion seat is provided with an upper rotary slope matched with the lower rotary slope, and the upper rotary slope is in contact with the lower rotary slope.

[0016] Further, in the above technical solution, the lower rotary-to-linear motion seat is provided with a lower rotary slope at the upper end, and the upper rotary-to-linear motion seat is provided with an upper rotary slope matched with the lower rotary slope, and the upper rotary slope is in contact with the lower rotary slope.

[0017] After the above technical solution is adopted, the utility model discloses the following beneficial effects compared with the prior art: the utility model discloses the damper is fixed in the shell, the shell is completely covered on the outer surface of the stainless steel shell of the damper, which can increase the volume of the whole product, so that the user holds and installs and uses, and simultaneously, the outer surface of the shell is integrally formed with the plurality of anti-skid convex parts of the step, so that when using, the user directly holds the oil-free shell with hand and contacts the plurality of anti-skid convex parts on the step, which can achieve the purpose of anti-skid, and can better force operation, and the damper assembly is easy to assemble and disassemble when using, in addition, when the head with flat structure at the upper end of the utility model is inserted into the installation position of the workpiece (such as a cover plate), the guiding and limiting lock arm that can produce elastic deformation is formed on the outer shell, even if the head cannot be seen or is difficult to see when installing, but through the guidance of the guiding and limiting lock arm, it can be smoothly inserted into the installation position, can be conveniently assembled into the workpiece (such as a cover plate) without careful observation by the human eye, can improve the assembly efficiency and reduce the production cost, and the guiding and limiting lock arm can also be clamped and fixed with the clamping groove in the installation position, so that the whole damper assembly and the workpiece (such as a cover plate) form stable assembly, and the assembly quality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the perspective view of the utility model;

[0019] Figure 2 is the perspective view of another angle of the utility model;

[0020] Figure 3 is the exploded view of the utility model;

[0021] Figure 4 is the perspective view of the shell in the utility model;

[0022] Figure 5 is the sectional view of the shell in the utility model;

[0023] Figure 6 is the perspective exploded view of the damper in the utility model;

[0024] Figure 7 is the perspective view of the damper after the stainless steel shell is disassembled in the utility model, and

[0025] Figure 8 is the perspective view of the upper rotary linear motion seat in the utility model. DETAILED DESCRIPTION

[0026] The utility model is further illustrated in connection with specific embodiments and drawings.

[0027] See Figures 1-8 As shown in the figure, it is a damper assembly with a shell, which comprises a damper 100 and a shell 7, the damper 100 has a stainless steel shell 1, and the upper end of the damper 100 has a head 101 with a flat structure, and the shell 7 completely covers the outer surface of the stainless steel shell 1.

[0028] The damper 100 comprises the stainless steel shell 1, a guide column 2 installed in the stainless steel shell 1, a lower rotary linear motion seat 3 sleeved on the guide column 2 in a way that can move up and down and cannot rotate, a spring 4 installed in the stainless steel shell 1 and pressing the lower rotary linear motion seat 3 from bottom to top, an oil sealing block 31 installed on the periphery of the lower rotary linear motion seat 3 and in sealing contact with the inner wall of the stainless steel shell 1, an upper rotary linear motion seat 5 installed on the stainless steel shell 1 in a rotatable way, matched with the lower rotary linear motion seat 3 and sleeved on the upper end of the guide column 2 in a way that can slide up and down, a sealing ring 51 sleeved on the outside of the upper rotary linear motion seat 5 and in sealing contact with the inner wall of the stainless steel shell 1, and a limiting piece 6 for limiting the upper rotary linear motion seat 5 on the upper end of the stainless steel shell 1; a sealing chamber is formed between the lower end of the lower rotary linear motion seat 3 and the inner cavity of the stainless steel shell 1 after the lower end of the lower rotary linear motion seat 3 is matched with the oil sealing block, and damping grease is injected in the sealing chamber; the upper end of the upper rotary linear motion seat 5 has the head 101.

[0029] The damper 100 is assembled by sleeving the sealing ring 51 on the upper rotary-to-linear motion seat 5, butting the lower rotary-to-linear motion seat 3 with the upper rotary-to-linear motion seat 5, inserting the long guide pin 50 at the lower end of the upper rotary-to-linear motion seat 5 into the lower rotary-to-linear motion seat 3, and forming a gap therebetween, and then sleeving the oil sealing block 31 into the lower clamping groove of the lower rotary-to-linear motion seat 3 to form an assembly; then the guide column 2 is inserted into the center of the assembly, wherein the lower rotary-to-linear motion seat 3 is also sleeved on the outside of the guide column 2, the upper rotary-to-linear motion seat 5 is sleeved on the upper end of the guide column 2, and the long guide pin 50 at the lower end of the upper rotary-to-linear motion seat 5 is inserted into the center groove 20 at the upper end of the guide column 2 from top to bottom; then the spring 4 is sleeved on the lower end of the guide column 2 and abuts against the lower end of the lower rotary-to-linear motion seat 3 to form a semi-finished product; finally, after injecting damping grease into the stainless steel shell 1, the semi-finished product is sleeved into the stainless steel shell 1, the limiting piece 6 is pressed into the upper end opening of the stainless steel shell 1 and fixed to limit the semi-finished product in the stainless steel shell 1 to form the damper 100, wherein the head 101 with a flat structure formed at the upper end of the upper rotary-to-linear motion seat 5 passes through the limiting piece 6 to be exposed outside the stainless steel shell 1.

[0030] The lower rotary-to-linear motion seat 3 is provided with a lower rotary inclined surface 33 at the upper end; the upper rotary-to-linear motion seat 5 is provided with an upper rotary inclined surface 52 adapted to the lower rotary inclined surface 33, and the upper rotary inclined surface 52 is in contact with the lower rotary inclined surface 33.

[0031] The lower rotary-to-linear motion seat 3 has a center hole 32 penetrating the upper and lower ends, and the upper rotary-to-linear motion seat 5 is provided with a center sliding groove 53 at the lower end; the lower rotary-to-linear motion seat 3 is sleeved on the guide column 2 and can slide up and down relative to the guide column 2 through the center hole 32; and the upper rotary-to-linear motion seat 5 is sleeved on the upper end of the guide column 2 and can rotate relative to the guide column 2 through the center sliding groove 53.

[0032] When the head 101 is fixedly assembled with the workpiece (such as a cover plate), in operation, through the rotating movement of the workpiece (such as the cover plate), the synchronous rotation of the upper rotary linear motion seat 5 connected thereto is transmitted, and through the cooperation of the upper rotary inclined surface 52 of the upper rotary linear motion seat 5 and the lower rotary inclined surface 33 of the lower rotary linear motion seat 3, the lower rotary linear motion seat 3 is driven to move downward correspondingly through the helical characteristic rotation, so that greater spring compression force is generated, and the damping grease at the lower part of the oil seal 31 generates a damping thrust to resist the movement of the lower rotary linear motion seat 3 through the small gap between the oil seal 31 and the lower rotary linear motion seat 3, so that a thrust is generated to resist the downward movement of the lower rotary linear motion seat 3, and then a reaction force is generated for the rotation of the upper rotary linear motion seat 5, so that the rotating movement of the workpiece (such as the cover plate) is slowed down, the workpiece (such as the cover plate) is prevented from falling and violently impacting the workpiece (such as the cover plate), and the purpose of preventing the workpiece (such as the cover plate) from being impacted by the rotating cover and generating abnormal sound or being damaged is achieved.

[0033] The shell 7 is made of plastic, that is, it is formed by plastic injection molding, and has low cost.

[0034] The shell 7 has a receiving cavity 71 for inserting the stainless steel shell 1, and the outer surface of the shell 7 is integrally formed with a step 70 for anti-skid, and the step 70 has a plurality of outwardly protruding anti-skid protrusions 702; the outer surface of the shell 7 is further formed with a guide limiting lock arm 74 capable of elastically deforming, and the stainless steel shell 1 of the damper 100 is inserted and fixed in the receiving cavity 71 of the shell 7. That is, the damper 100 is inserted and fixed in the shell 7, and the shell 7 completely covers the outer surface of the stainless steel shell 1 of the damper 100, so that the volume of the entire product can be increased to facilitate the user to hold, install and use; at the same time, the outer surface of the shell 7 is integrally formed with the step 70 having a plurality of anti-skid protrusions 702, so that when in use, the user directly holds the oil-free shell 7 with hands and contacts the plurality of anti-skid protrusions 702 on the step 70, which can achieve the purpose of anti-skid and better force operation, and facilitate the assembly and disassembly of the damper assembly in use; in addition, when the head 101 with a flat structure at the upper end of the utility model is inserted into the mounting position of the workpiece (such as the cover plate), the guide limiting lock arm 74 capable of elastically deforming is further formed on the outer surface of the shell 7, so that the head 101 cannot be seen or is difficult to be seen during installation, but through the guidance of the guide limiting lock arm 74, it can be smoothly inserted into the mounting position, and the workpiece (such as the cover plate) can be conveniently installed without careful observation by the human eye, the assembly efficiency can be improved, and the production cost can be reduced; and the guide limiting lock arm 74 can also be clamped and fixed in the clamping groove in the mounting position, so that the entire damper assembly and the workpiece (such as the cover plate) form stable assembly, and the assembly quality is improved.

[0035] In order to ensure that the damper 100 can form stable assembly and realize synchronous rotation after being inserted into the shell 7, the following design is made.

[0036] Firstly, the lower part of the stainless steel shell 1 is provided with at least one limiting plane 11, and the accommodating cavity 71 is formed with a limiting convex rib 72 matched with the limiting plane 11. The limiting convex rib 72 is assembled with the limiting plane 11 to limit the stainless steel shell 1 in the accommodating cavity 71 of the shell 7. That is, the stainless steel shell 1 is inserted into the accommodating cavity 71 of the shell by inlaying. When completely inserted into position, the limiting convex rib 72 is assembled with the limiting plane 11 to achieve the purpose of tension positioning, thereby limiting the stainless steel shell 1 in the accommodating cavity 71 of the shell 7. Not only the stability of the assembly structure can be ensured, but also the damper 100 and the shell 7 can be rotated synchronously, that is, when the shell 7 is rotated, the damper 100 inside can be driven to rotate synchronously.

[0037] In order to improve the stability of the assembly structure, the lower part of the stainless steel shell 1 is provided with two symmetrically distributed limiting planes 11. Correspondingly, the number of limiting convex ribs 72 is also two, which are symmetrically distributed in the accommodating cavity 71 and assembled one by one in the accommodating cavity 71, thereby improving the stability of the assembly structure.

[0038] In order to ensure the smoothness of the assembly of the stainless steel shell 1 during the insertion into the accommodating cavity 71 of the shell, the following design is made: the inner side of the upper end of the limiting convex rib 72 is formed with a guide slope 721. When the limiting plane 11 at the lower end of the stainless steel shell 1 contacts with the limiting convex rib 72, it first contacts with the guide slope 721 at the inner side of the upper end of the limiting convex rib 72. Since the guide slope 721 is inclined, it can play a good guiding role and guide the stainless steel shell 1 to be more smoothly inserted between the two limiting convex ribs 72, and make the limiting convex rib 72 and the limiting plane 11 at the lower end of the stainless steel shell 1 slowly fit tightly. In this way, when the stainless steel shell 1 is completely inserted into position, the limiting convex rib 72 is assembled with the limiting plane 11 to achieve the purpose of tension positioning.

[0039] In the process of inserting the stainless steel shell 1 into the accommodating cavity 71 of the shell, the resistance caused by compressing the gas in the accommodating cavity 71 is avoided, and the following design is made: in the embodiment, the limiting protrusions 72 are provided with exhaust grooves 722 extending along the length direction of the shell 7, and the bottom of the shell 7 is provided with a hole position 73 penetrating the accommodating cavity 71; after the limiting protrusions 72 are combined with the limiting planes 11, the exhaust grooves 722 form an exhaust passage with the exhaust grooves 722. That is, when the stainless steel shell 1 is inserted into the accommodating cavity 71 of the shell, the air in the accommodating cavity 71 can be exhausted through the hole position 73 at the bottom of the shell 7, thereby avoiding the influence of the production gas resistance on the insertion; when the limiting planes 11 of the stainless steel shell 1 are in contact with the limiting protrusions 72, the limiting planes 11 and the limiting protrusions 72 can be combined and assembled tightly through the exhaust passage, thereby improving the stability of the assembly structure.

[0040] The shell 7 is externally provided with a hole 701 in the shape of an inverted U to form the guide limiting lock arm 74, the upper end of the guide limiting lock arm 74 is externally formed with a lock catch 742, the upper end of the lock catch 742 is externally provided with an inclined guide surface 743, the inner side of the guide limiting lock arm 74 is thinned, so that the inner side surface of the guide limiting lock arm 74 is lower than the inner side surface of the shell 7, so that the inner side surface of the guide limiting lock arm 74 and the outer wall of the stainless steel shell 1 form a space for the elastic deformation of the guide limiting lock arm 74, so that the guide limiting lock arm 74 has enough space to be compressed from the outside to the inside, thereby generating elastic deformation, so as to achieve smooth assembly.

[0041] The guide limiting lock arm 74 is integrally formed with an outwardly protruding stop block 741 at the lower end, which can block the lock catch 742 of the guide limiting lock arm 74 from being pushed when it is in the locked state, thereby forming stable assembly.

[0042] The utility model can be applied to household appliances, smart home, door body, automobile, machinery and other environments that need to have buffering.

[0043] In conclusion, the utility model discloses the damper 100 is fixed in the shell 7, make the shell 7 completely cover in the stainless steel casing 1 outer surface of damper 100, with this can increase the volume of whole product, to facilitate user holding installation uses, simultaneously, because the shell 7 outer surface integrative formation has the step 70 of having multiple antiskid convex part 702, so that in use, user directly holds the oil -free shell 7 with hand, and with multiple antiskid convex part 702 on the step 70 contact, it can reach the purpose of antiskid, and can better force operation, easily damper assembly uses when assembling and disassembling, in addition, when the utility model top end with flat structure head 101 is inserted work piece (such as cover) installation position, because the shell 7 outside still formation can produce elastic deformation's guide limiting lock arm 74, even when installing, can not see or difficult to see head 101, but through the guide of guide limiting lock arm 74, it can smoothly insert installation position, can not need human eye to observe carefully and can very convenient install work piece (such as cover), can improve assembly efficiency, reduce production cost, and the guide limiting lock arm 74 still can with the clamping groove in installation position clamping fixed, then make whole damper assembly and work piece (such as cover) form stable assembly, improve assembly quality.

[0044] Of course, the above only for the specific embodiment of the utility model has, and not to limit the utility model implementation range, all equivalent changes or modifications, which are made according to the structure, features and principles of the utility model patent application scope described, should be included in the utility model patent application scope.

Claims

1. A damper assembly with a shell, comprising a damper (100) having a stainless steel shell (1), and the damper (100) has a head (101) with a flat structure at the upper end, characterized in that: It also comprises a shell (7) having a receiving cavity (71) for inserting the stainless steel shell (1), and the outer surface of the shell (7) is integrally formed with a step (70) for anti-skid, and the step (70) has a plurality of outwardly protruding anti-skid protrusions (702); The outer part of the shell (7) is also formed with a guide limiting lock arm (74) that can produce elastic deformation, and the stainless steel shell (1) of the damper (100) is inserted and fixed in the receiving cavity (71) of the shell (7).

2. A damper assembly with an attached housing according to claim 1, wherein: The lower part of the stainless steel shell (1) is provided with at least one limiting plane (11), and the receiving cavity (71) is formed with a limiting protrusion (72) matched with the limiting plane (11), which is assembled with the limiting plane (11) to limit the stainless steel shell (1) in the receiving cavity (71) of the shell (7).

3. A damper assembly with an attached housing according to claim 2, wherein: The lower part of the stainless steel shell (1) is provided with two symmetrically distributed limiting planes (11).

4. A damper assembly with an attached housing according to claim 2, wherein: The upper end of the limiting protrusion (72) is formed with a guide inclined surface (721) on the inner side.

5. A damper assembly with an attached housing according to claim 2, wherein: The limiting protrusion (72) is provided with an exhaust groove (722) extending along the length direction of the shell (7), and the bottom of the shell (7) is provided with a hole (73) penetrating the receiving cavity (71); After the limiting protrusion (72) is matched with the limiting plane (11), the exhaust groove (722) forms an exhaust passage with the exhaust groove (722).

6. A damper assembly with an attached housing according to claim 1, wherein: The lower end of the guide limiting lock arm (74) is integrally formed with an outwardly protruding stop block (741) on the periphery.

7. A dumper assembly with an attached housing according to any one of claims 1 to 6, wherein: The outer part of the shell (7) is provided with a reverse U-shaped aperture (701) to form the guide limiting lock arm (74), and the upper end of the guide limiting lock arm (74) is formed with a lock (742) on the outer side, and the upper end of the lock (742) is provided with an inclined guide surface (743) on the periphery, and the inner side of the guide limiting lock arm (74) is thinned, so that the inner side of the guide limiting lock arm (74) is lower than the inner side of the shell (7), so that the inner side of the guide limiting lock arm (74) and the outer wall of the stainless steel shell (1) form a space for the guide limiting lock arm (74) to produce elastic deformation.

8. A dumper assembly with an attached housing according to any one of claims 1 to 6, wherein: The damper (100) comprises the stainless steel shell (1), the guide column (2) installed in the stainless steel shell (1), the lower rotary-to-linear motion seat (3) sleeved on the guide column (2) in a manner of being movable up and down and not rotatable, the spring (4) installed in the stainless steel shell (1) and pressing the lower rotary-to-linear motion seat (3) from bottom to top, the oil sealing block (31) installed on the periphery of the lower rotary-to-linear motion seat (3) and in sealing contact with the inner wall of the stainless steel shell (1), the upper rotary-to-linear motion seat (5) installed on the stainless steel shell (1) in a rotatable manner, cooperatively installed with the lower rotary-to-linear motion seat (3) and sleeved on the upper end of the guide column (2) in a manner of being movable up and down, the sealing ring (51) sleeved on the outside of the upper rotary-to-linear motion seat (5) and in sealing contact with the inner wall of the stainless steel shell (1), and the limiting sheet (6) for limiting the upper rotary-to-linear motion seat (5) on the upper end of the stainless steel shell (1); the lower end of the lower rotary-to-linear motion seat (3) is in contact with the oil sealing block, and a sealed chamber is formed between the lower end of the lower rotary-to-linear motion seat (3) and the inner cavity of the stainless steel shell (1), and damping grease is injected into the sealed chamber; the upper end of the upper rotary-to-linear motion seat (5) has the head (101).

9. A damper assembly with an attached housing according to claim 8, wherein: The upper end of the lower rotary-to-linear motion seat (3) is provided with a lower rotary inclined surface (33); the lower end of the upper rotary-to-linear motion seat (5) is provided with an upper rotary inclined surface (52) matched with the lower rotary inclined surface (33), and the upper rotary inclined surface (52) is in contact with the lower rotary inclined surface (33).

10. A damper assembly with an attached housing according to claim 8, wherein: The lower rotary-to-linear motion seat (3) has a central hole (32) penetrating the upper and lower ends, the lower end of the upper rotary-to-linear motion seat (5) is provided with a central sliding groove (53), the lower rotary-to-linear motion seat (3) is sleeved on the guide column (2) through the central hole (32) and is movable up and down relative to the guide column (2); and the upper rotary-to-linear motion seat (5) is sleeved on the upper end of the guide column (2) through the central sliding groove (53) and is rotatable relative to the guide column (2).

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