Brake assembly and lifting stand column adopting same

Abstract

The utility model discloses a brake assembly and a lifting stand column adopting the brake assembly, and relates to the technical field of lifting stand columns. The brake assembly comprises a connecting piece, a mounting seat and a self-locking spring, the connecting piece comprises a first spline part, a connecting part and a second spline part which are sequentially arranged, the connecting part comprises a cylindrical surface and a limiting structure, the cylindrical surface on one side of the limiting structure is sleeved with the mounting seat, the mounting seat abuts against the limiting structure, and the self-locking spring is arranged on the mounting seat. The connecting piece and the mounting seat can rotate relatively in the circumferential direction; the self-locking spring is arranged on the cylindrical face of the other side of the limiting structure in a sleeving mode, and one end of the self-locking spring is limited to the mounting base. The braking assembly serves as an independent module, so that the self-locking force value of the braking assembly can be measured before assembly, the self-locking force values of lifting stand columns in the same batch tend to be consistent when the braking assembly is installed after measurement, and when two or more lifting stand columns operate at the same time, shaking caused by inconsistent self-locking force values between different lifting stand columns can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lifting column, concretely relates to a brake assembly and the lifting column adopting the brake assembly. BACKGROUND

[0002] The lifting column comprises a sleeve assembly, a transmission assembly and a motor driving unit, and the sleeve assembly is retracted or extended by driving the transmission assembly to move through the motor, and is widely applied to height-adjustable furniture or office supplies such as beds, chairs and tables. Generally, after the motor stops running, the lifting column will slide downward due to the load, which will affect the safety and normal use of the user, so the lifting column needs a certain self-locking force.

[0003] In order to solve the above problems, through retrieval, Chinese patent CN106966345A discloses a telescopic transmission assembly device and a lifting column, a driving device is in transmission cooperation with a transmission screw rod (i.e. a solid screw rod), the transmission screw rod is installed on a fixed plate through a fourth bearing sleeved on the upper part of the transmission screw rod to realize the positioning of the transmission screw rod and the fixed plate in the axial direction, an installation seat is sleeved on the end of the transmission screw rod, a torsional spring is arranged on the installation seat, the torsional spring is clamped with the fixed plate through a pin, the installation seat and the torsional spring can rotate when the transmission screw rod rotates, and the torsional spring can exert a torsional force on the transmission screw rod during the descending process of the lifting column to realize the self-locking function of the transmission screw rod without power input. However, the scheme still has the following defects: 1) the transmission screw rod is prone to bending deformation and straightness deterioration under the influence of the load of the lifting column, especially at the maximum stroke, the transmission screw rod is prone to deflection during the operation of the lifting column, which can cause the shaking of the lifting column, and the torsional spring will shake with the transmission screw rod, so the self-locking force is unstable; 2) the self-locking force of the lifting column can only be measured after the assembly is completed, if the self-locking force value does not meet the requirements, the lifting column needs to be disassembled to replace or adjust the self-locking spring, which is extremely inconvenient.

[0004] Chinese patent CN208532163U discloses a transmission device and a lifting column, in order to increase the self-locking force of the whole transmission device, a first brake torsional spring is arranged on the transmission screw rod (i.e. a solid screw rod), and a second brake torsional spring is arranged on the hollow shaft (i.e. a hollow screw rod), the scheme also has the defects in CN106966345A, and 1) the structure of the scheme is complex and inconvenient to install; 2) since two brake torsional springs are arranged, the resistance values of the two brake torsional springs are inconsistent, which can also cause the shaking of the lifting column. SUMMARY

[0005] 1. Problem to be solved

[0006] In view of the above technical problems, the utility model aims to provide a brake assembly, the self-locking force value of which can be measured before assembly, and the self-locking stability of which is high after being installed in the lifting column.

[0007] The utility model discloses another purpose provides a lift column with the brake assembly of above.

[0008] 2, technical scheme

[0009] To realize above -mentioned purpose, the utility model adopts following technical scheme:

[0010] The utility model discloses a brake assembly, including connecting piece, mounting seat and self locking spring, the connecting piece includes the first spline portion, connecting portion and second spline portion that set gradually, the connecting portion includes the cylinder surface and the limiting structure on the cylinder surface, the first spline portion passes through the mounting seat, the mounting seat is set on the cylinder surface of limiting structure one side, and with the abutting of limiting structure, so that the connecting piece and mounting seat circumferential can rotate relative to each other, the self locking spring is set on the cylinder surface of limiting structure other side, and the self locking spring one end is limited on the mounting seat. When using, first self locking spring is installed from the first spline portion side, and the self locking spring passes through the first spline portion and is set on the second cylinder surface, then mounting seat is installed from the first spline portion side, and the mounting seat is set on the first cylinder portion, and makes the self locking spring and mounting seat clamping, and the connecting piece, mounting seat and self locking spring constitute an integral structure.

[0011] The utility model discloses a brake assembly, not only its self locking force can be determined before assembly, and after determining, installing can make the self locking force value of the same batch lift column tend to be consistent, when two or more than two lift columns run simultaneously, can effectively avoid the shaking of different lift columns because of the inconsistent self locking force value, and moreover, the application in lift column, the mounting seat can be longitudinally limited connecting piece, thereby effectively avoiding the bending or deflection of connecting piece, the self locking spring and mounting seat clamping, improve the stability and consistency of the self locking performance of lift column.

[0012] According to any embodiment of the first aspect of the utility model's purpose, in order to facilitate mounting seat from the first spline portion side and install quickly, the cylinder surface includes first cylinder surface and second cylinder surface, the outer diameter of first cylinder surface is less than the outer diameter of second cylinder surface, the limiting structure is first limiting step surface at the connecting place of first cylinder surface and second cylinder surface, the mounting seat is set on first cylinder surface, and the self locking spring is set on second cylinder surface.

[0013] According to any embodiment of the first aspect of the utility model's purpose, the second limiting step surface is formed between the second cylinder surface and the second spline portion, and the self locking spring is limited between the mounting seat and the second limiting step surface.

[0014] According to any one of the embodiments of the first aspect of the utility model purposes, the mounting seat is formed with a mounting hole along a central axis, a circular arc surface is formed around the inner side of the mounting hole, the circular arc surface extends outward to form a stepped protrusion, a protruding circular table is formed around the outer side of the mounting hole, the inner wall of the protruding circular table is attached to the first cylindrical surface, and the stepped protrusion abuts against the limiting stepped surface.

[0015] It should be noted that the relative position relationship of the inner side and the outer side of the mounting hole is along the axial direction of the mounting hole; the protruding circular table is attached to the first cylindrical surface, thereby increasing the contact area therebetween and ensuring the concentricity of the connecting piece and the mounting seat in the longitudinal direction; the design of the circular arc surface reduces the contact area of the mounting seat and the limiting stepped surface, and the stepped protrusion and the limiting stepped surface form linear contact or even point contact, thereby reducing the friction between the mounting seat and the connecting piece in the transverse direction and effectively reducing the power loss of the motor.

[0016] According to any one of the embodiments of the first aspect of the utility model purposes, a support plate is formed around the stepped protrusion, and the end surface height of the support plate is not higher than the end surface height of the stepped protrusion, thereby increasing the strength of the stepped protrusion.

[0017] According to any one of the embodiments of the first aspect of the utility model purposes, the limiting structure is a boss located on the cylindrical surface, and the boss is arranged close to the first spline part.

[0018] According to any one of the embodiments of the first aspect of the utility model purposes, the mounting seat is formed with a mounting hole along a central axis, a circular arc surface is formed around the inner side of the mounting hole, the circular arc surface extends outward to form a stepped protrusion, a protruding circular table is formed around the outer side of the mounting hole, and the stepped protrusion abuts against the boss.

[0019] According to any one of the embodiments of the first aspect of the utility model purposes, the mounting seat has a plurality of peripheral walls, the upper edge of at least one of the peripheral walls is provided with an outward protruding edge, and the other peripheral wall is provided with an undercut.

[0020] According to any one of the embodiments of the first aspect of the utility model purposes, in order to ensure that the self-locking spring is relatively stationary with the mounting seat, further, a limiting groove is arranged at the included angle formed by the two adjacent peripheral walls, and the outward protruding edge of the self-locking spring is formed with a hook, wherein the hook is embedded in the limiting groove.

[0021] According to any one of the embodiments of the first aspect of the utility model purposes, the mounting seat has four peripheral walls, the upper edge of any two opposite peripheral walls is provided with an outward protruding edge, and the other two opposite peripheral walls are provided with an undercut.

[0022] According to any embodiment of the first aspect of the utility model purposes, still set up the avoiding groove on the circumferential wall of the reverse buckle, the reverse buckle is set up along the avoiding groove bottom edge obliquely upwards.

[0023] According to any embodiment of the first aspect of the utility model purposes, the height of the protruding circular truncated cone is 0.5-1.5mm, and the thickness is 0.5-1.5mm;The arc of the circular arc surface is 1-3mm, and the height of the stepped projection is 0.1-0.3mm.

[0024] According to any embodiment of the first aspect of the utility model purposes, the mounting seat has several circumferential walls, the upper edge of at least one circumferential wall is provided with an outer convex edge, and at least one circumferential wall is provided with a reverse buckle, the mounting box is provided with an assembly hole matched with the shape of the circumferential wall periphery, and the reverse buckle is reset and clamped with the mounting box after being squeezed into the assembly hole. The circumferential wall can ensure the stability of the mounting seat after installation, the outer convex edge is convenient for limiting, the reverse buckle is convenient for further fixing after installation, and the assembly hole is convenient for connecting the connecting piece.

[0025] The utility model provides a kind of lifting column in the second aspect, including mounting box, inner tube assembly, outer tube assembly, circular tube, screw rod and the brake assembly as described in the first aspect, and the mounting seat of brake assembly is connected with the mounting box;The inner tube assembly is fixedly connected with mounting box, and the circular tube is arranged in inner tube assembly, one end of the circular tube is connected with brake assembly, and the other end of the circular tube is fixedly connected with screw rod nut, and the screw rod nut is fixedly connected with inner tube assembly, one end of the screw rod passes through the screw rod nut and is located in the circular tube, and the other end of the screw rod is fixedly connected with outer tube assembly.

[0026] The brake assembly includes a connecting piece, a mounting seat, and a self-locking spring. The connecting piece includes a first spline portion, a connecting portion, and a second spline portion arranged in sequence. The connecting portion includes a cylindrical surface and a limiting structure. The mounting seat is sleeved on the cylindrical surface on one side of the limiting structure and abuts against the limiting structure, so that the connecting piece and the mounting seat can rotate relative to each other in the circumferential direction. The self-locking spring is sleeved on the cylindrical surface on the other side of the limiting structure, and one end of the self-locking spring is limited on the mounting seat.

[0027] According to any embodiment of the second aspect of the utility model purposes, the limiting structure is a boss located on the cylindrical surface, and the boss is arranged close to the first spline portion;The self-locking spring is limited between the boss and the end surface of the circular tube.

[0028] 3. Beneficial effects

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] (1) the utility model discloses a brake assembly, wherein the mounting seat and the limiting structure of connecting piece abut, so that the self-locking force value (value size) can be determined before assembly, and after determination, installation can make the self-locking force value of same batch lifting column tend to be consistent, when two or more than two lifting columns operate simultaneously, can effectively avoid the shaking of different lifting columns due to inconsistent self-locking force value.

[0031] (2) be applied in the utility model's lifting column, the self-locking spring is sleeved on the connecting piece, compared with the self-locking spring sleeved on the screw rod, the connecting piece is not affected by the load change force in the axial direction, therefore the connecting piece is not easy to bend and is not easy to produce the deflection, and the self-locking force is relatively uniform.

[0032] (3) be applied in the utility model's lifting column, the connecting piece in brake assembly only transmits torque, does not bear axial force, the connecting piece is not easy to damage or deform, and the self-locking spring is not easy to shake, so that the self-locking force value of brake assembly is not easy to be interfered by external force, and the self-locking force of lifting column is uniform, and the operating performance is stable. BRIEF DESCRIPTION OF DRAWINGS

[0033] The technical scheme of the utility model will be described in further detail below in combination with the drawings and examples, but it should be known that these drawings are only designed for the purpose of explanation, so the utility model range is not limited by these drawings.In addition, unless specifically pointed out, these drawings are only intended to conceptually illustrate the structural configuration described herein, and are not necessarily drawn to scale.

[0034] Figure 1 It is the structure schematic view of brake assembly of the utility model embodiment 1;

[0035] Figure 2 It is the structure schematic view of brake assembly of the utility model embodiment 1;

[0036] Figure 3 It is the structure schematic view of connecting piece of brake assembly of the utility model embodiment 1;

[0037] Figure 4 It is the structure schematic view of self-locking spring of brake assembly of the utility model embodiment 1;

[0038] Figure 5 It is one view angle structure schematic view of mounting seat of brake assembly of the utility model embodiment 1;

[0039] Figure 6 It is another view angle structure schematic view of mounting seat of brake assembly of the utility model embodiment 1;

[0040] Figure 7 It is the front view structure schematic view of mounting seat of brake assembly of the utility model embodiment 1;

[0041] Figure 8 It is the cross section structure schematic view of mounting seat of brake assembly of the embodiment 1 of the utility model;

[0042] Figure 9 It is the structure schematic view of the brake assembly of the embodiment 1 of the utility model lift column is equipped with;

[0043] Figure 10 It is the structure schematic view of connecting piece of the brake assembly of the embodiment 2 of the utility model;

[0044] Figure 11 It is the structure schematic view of the brake assembly of the embodiment 2 of the utility model lift column is equipped with;

[0045] Mark explanation:

[0046] 1, mounting box;

[0047] 2, brake assembly;21, connecting piece;211, first spline part;212, connecting part;2121, first cylindrical surface;2122, second cylindrical surface;2123, first limit step surface;2124, second limit step surface;2125, boss;213, second spline part;22, mounting seat;221, mounting hole;2211, arc surface;2212, step protrusion;2213, protruding circular table;2214, support plate;222, peripheral wall;2221, outer convex edge;2222, reverse buckle;2223, avoiding groove;2224, limit groove;23, self-locking spring;231, hook;

[0048] 3, inner tube assembly;

[0049] 4, outer tube assembly;

[0050] 5, round pipe;

[0051] 6, lead screw;

[0052] 7, lead screw nut. DETAILED DESCRIPTION

[0053] The present disclosure can be more readily understood by reference to the following description, taken in conjunction with the accompanying drawings and examples, which constitute a part of this disclosure. It is to be understood that the disclosure is not limited to the specific products, methods, conditions or parameters described and / or shown herein, unless otherwise specified. Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting, unless otherwise specified.

[0054] It should also be understood that certain features of the disclosure, which are, for clarity, described in the context of separate embodiments, can also be provided in combination in a single embodiment. That is, unless explicitly stated to the contrary, each separate or unique embodiment is considered an embodiment independent of the other embodiments, and all combinations of embodiments are considered to be incorporated into another embodiment. Conversely, various features of the disclosure, which are, for brevity, described in the context of a single embodiment, can also be provided separately or in any subcombination. Finally, while the specific embodiments can be described as a series of steps or as a series of structures, each of the steps and the structures can be considered independent embodiments.

[0055] Unless otherwise stated, it is to be understood that each individual element in a list and every combination of individual elements in that list will be interpreted as a different embodiment. For example, a list of embodiments recited as“A, B, or C” should be interpreted as including the embodiments“A,”“B,”“C,”“A or B,”“A or C,”“B or C,” or“A, B, or C.”

[0056] In the disclosure, the singular forms“a,”“an,” and“the” include their

[0057] Terms including ordinal numbers such as“first” and“second” can be used to explain various components or fluids, but the components, fluids are not limited by the terms. Thus, the terms are used only to distinguish the component / fluid from another component / fluid without departing from the teaching of the disclosure.

[0058] When describing items by using conjunctive terms such as“… and / or …” and the like, the description should be understood to include any one of the associated listed items and all combinations of one or more of them.

[0059] In general, the use of the term“about” indicates an approximation that can vary depending on the desired characteristics obtained by the disclosed subject matter and will be interpreted based on functionality in a context-dependent manner. Thus, a person of ordinary skill in the art will be able to interpret a degree of difference on a case-by-case basis. In some cases, the number of significant digits used in expressing a particular value can be representative of the degree of precision to which the term“about” allows for variation. In other cases, a range of values in a series of values can be used to determine the range of variation allowed by the term“about.” Further, all ranges in the disclosure are inclusive and combinable, and the mention of a value stated in a range includes each value within the range.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein have their ordinary meaning in the art and / or any special meanings of the terms are cited directly from the specification, examples and / or figures.

[0061] Embodiment 1

[0062] As shown in Figure 1 and Figure 2 , the brake assembly 2 of the embodiment comprises a connecting piece 21, a mounting seat 22 and a self-locking spring 23.

[0063] As shown in Figure 3 , the connecting piece 21 comprises a first spline portion 211, a connecting portion 212 and a second spline portion 213 arranged in sequence, the connecting portion 212 comprises a cylindrical surface and a limiting structure, the cylindrical surface comprises a first cylindrical surface 2121 and a second cylindrical surface 2122, the outer diameters of the first cylindrical surface 2121, the second cylindrical surface 2122 and the second spline portion 213 increase in sequence; the limiting structure is a first limiting step surface 2123 located at the connecting position of the first cylindrical surface 2121 and the second cylindrical surface 2122; a second limiting step surface 2124 is formed at the connecting position of the second cylindrical surface 2122 and the second spline portion 213, the self-locking spring 23 is sleeved on the second cylindrical surface 2122, the mounting seat 22 is sleeved on the first cylindrical surface 2121 and is clamped with the self-locking spring 23.

[0064] In use, the self-locking spring 23 is first installed from the first spline portion 211 side, and then the mounting seat 22 is installed from the first spline portion 211 side, the self-locking spring 23 is limited between the mounting seat 22 and the second limiting step surface 2124, and the self-locking spring 23 is clamped with the mounting seat 22, and the connecting piece 21, the mounting seat 22 and the self-locking spring 23 form an integral structure.

[0065] The above structure design makes the self-locking force of the brake assembly measurable before assembly, and after measurement, installation can make the self-locking force values of the same batch of lifting columns consistent, and when two or more lifting columns are operated at the same time, shaking between different lifting columns due to inconsistent self-locking force values can be effectively avoided.

[0066] As shown in Figure 2 , Figure 5 and Figure 6 , the mounting seat 22 is formed with a mounting hole 221 along the central axis, a circular arc surface 2211 is formed around the inner side of the mounting hole 221, and a stepped protrusion 2212 is formed by extending the circular arc surface 2211 outward; a protruding circular table 2213 is formed around the outer side of the mounting hole 221; the inner side and the outer side of the mounting hole 221 are in relative position relationship along the axial direction of the mounting hole 221.

[0067] The inner wall of the protruding circular platform 2213 is attached to the first cylindrical surface 2121, which increases the contact area between the two and ensures the concentricity of the connecting piece 21 and the mounting seat 22; the stepped protrusion 2212 abuts against the limiting stepped surface 2123, and the design of the circular arc surface 2211 reduces the contact area between the mounting seat 22 and the limiting stepped surface 2123, and the stepped protrusion 2212 and the limiting stepped surface 2123 form a line contact or even a point contact, as shown in Figure 2 The friction between the mounting seat 22 and the connecting piece 21 is reduced from the transverse direction, effectively reducing the power loss of the motor.

[0068] Further, as shown in Figure 2 In order to facilitate the quick installation of the mounting seat 22 from the first spline part 211 side, the inner diameter of the mounting hole 221 is greater than the outer diameter of the first spline part 211.

[0069] In combination with Figure 5 In order to increase the strength of the stepped protrusion 2212, a support plate 2214 is formed around the stepped protrusion 2212, which is radially distributed in a radial direction, and the end surface height of the support plate 2214 does not exceed the end surface height of the stepped protrusion 2212, avoiding the movement interference between the support plate 2214 and the limiting stepped surface 2123.

[0070] The connecting piece 21 in this embodiment is integrally pressed and formed, the height of the protruding circular platform 2213 is 0.5mm, and the thickness is 1mm, while the corresponding connecting piece length is increased, and the change in the connecting piece length will make the stroke longer; and the arc of the circular arc surface 2211 is 1.5mm, and the height of the stepped protrusion 2212 is 0.2mm, which provides the possibility of point contact and reduces the friction.

[0071] In order to ensure that the self-locking spring 23 is relatively stationary with the mounting seat 22, as shown in Figure 4 and Figure 5 Further, a limiting groove 2224 is arranged at the included angle formed by the two adjacent peripheral walls 222, and the self-locking spring 23 has a hook 231 formed outwardly, wherein the hook 231 is embedded in the limiting groove 2224.

[0072] Preferably, as shown in Figures 5 to 8 The mounting seat 22 has four peripheral walls 222, and the upper edges of any two opposite peripheral walls 222 are provided with outwardly protruding edges 2221, and the other two opposite peripheral walls 222 are provided with reverse buckles 2222. Further, the peripheral wall 222 provided with the reverse buckle 2222 is also provided with an avoidance groove 2223, and the reverse buckle 2222 is arranged obliquely upward along the bottom edge of the avoidance groove 2223.

[0073] AsFigure 9 As shown in the drawings, the embodiment provides a lifting column including a mounting box 1, an inner tube assembly 3, an outer tube assembly 4, a round tube 5, a lead screw 6, and a brake assembly 2, a mounting seat 22 of the brake assembly 2 is clamped in the mounting box 1; one end of the inner tube assembly 3 is fixedly connected with the mounting box 1, the round tube 5 is arranged in the inner tube assembly 3, one end of the round tube 5 is connected with the mounting box 1 through the brake assembly, the other end of the round tube 5 is fixedly connected with a lead screw nut 7, the lead screw nut 7 is fixedly connected with the other end of the inner tube assembly 3, one end of the lead screw 6 passes through the lead screw nut 7 and is located in the round tube 5, and the other end of the lead screw 6 is fixedly connected with the outer tube assembly 4.

[0074] Further, a mounting hole is formed in the mounting box 11 and is matched with the shape of the peripheral wall 222, and the reverse buckle 2222 is reset and clamped with the mounting box 11 after being squeezed and fitted into the mounting hole. The peripheral wall 222 can ensure the stability of the mounting seat 22 after installation, the outward convex edge 2221 facilitates limiting, the reverse buckle 2222 facilitates further fixing after installation, and the mounting hole facilitates the connection of the connecting piece 21.

[0075] When the outer tube assembly 4 is subjected to force, the outer tube assembly 4 first transmits the force to the lead screw 6, and then transmits the force to the inner tube assembly 3 and the mounting box 1 through the lead screw nut 7 sleeved on the lead screw 6, so that the round tube 5 is basically not subjected to axial force or load force, and only transmits torque, and the connecting piece 21 of the brake assembly 2 connected with the round tube 5 is also not subjected to axial force, so that the connecting piece 21 is not easy to be damaged or deformed, the self-locking spring 23 is sleeved on the connecting piece 21, the axial size of the connecting piece 21 is small, and the self-locking force is not uneven or the self-locking force is not lost due to bending, deflection and the like; and the self-locking spring 23 is not easy to shake, so that the self-locking force value of the brake assembly 2 is not easy to be disturbed by external force, the self-locking force of the lifting column is uniform, and the running performance is stable.

[0076] Embodiment 2

[0077] As shown in the drawings, Figure 10 and Figure 11 The brake assembly of the embodiment is different from that of embodiment 1 in that the limiting structure is a boss 2125 located on the cylindrical surface, the boss 2125 is arranged close to the first spline part 211, and the self-locking spring 23 is limited between the boss 2125 and the end face of the round tube 5.

[0078] In the embodiment, the protruding circular platform 2213 of the mounting seat 22 matches with the cylindrical surface, which increases the contact area between them and ensures the concentricity of the connecting piece 21 and the mounting seat 22 longitudinally; the stepped protrusion 2212 abuts against the boss 2125, and the design of the circular arc surface 2211 reduces the contact area between the mounting seat 22 and the boss 2125, while the stepped protrusion 2212 and the boss 2125 form linear contact or even point contact, which reduces the friction between the mounting seat 22 and the connecting piece 21 from the lateral direction and effectively reduces the power loss of the motor.

[0079] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

Claims

1. A brake assembly (2) comprising a connecting member (21), a mounting base (22) and a self-locking spring (23), characterized in that, The connecting piece (21) comprises a first spline portion (211), a connecting portion (212) and a second spline portion (213) arranged in sequence, the connecting portion (212) comprises a cylindrical surface and a limiting structure on the cylindrical surface, the first spline portion (211) passes through the mounting seat (22), the mounting seat (22) is sleeved on the cylindrical surface on one side of the limiting structure and abuts against the limiting structure, so that the connecting piece (21) and the mounting seat (22) can rotate relatively in the circumferential direction; the self-locking spring (23) is sleeved on the cylindrical surface on the other side of the limiting structure, and one end of the self-locking spring (23) is limited on the mounting seat (22).

2. The brake assembly (2) according to claim 1, characterized in that The cylindrical surface comprises a first cylindrical surface (2121) and a second cylindrical surface (2122), the outer diameter of the first cylindrical surface (2121) is smaller than that of the second cylindrical surface (2122), the limiting structure is a first limiting step surface (2123) at the connecting position of the first cylindrical surface (2121) and the second cylindrical surface (2122), the mounting seat (22) is sleeved on the first cylindrical surface (2121), and the self-locking spring (23) is sleeved on the second cylindrical surface (2122).

3. The brake assembly (2) according to claim 2, characterized in that A second limiting step surface (2124) is formed between the second cylindrical surface (2122) and the second spline portion (213), and the self-locking spring (23) is limited between the mounting seat (22) and the second limiting step surface (2124).

4. The brake assembly (2) according to claim 2, characterized in that The mounting seat (22) is formed with a mounting hole (221) along a central axis, a circular arc surface (2211) is formed around the inner side of the mounting hole (221), the circular arc surface (2211) extends outward to form a step protrusion (2212), a protruding circular table (2213) is formed around the outer side of the mounting hole (221), the inner wall of the protruding circular table (2213) is attached to the first cylindrical surface (2121), and the step protrusion (2212) abuts against the limiting step surface (2123).

5. The brake assembly (2) according to claim 4, characterized in that A support plate (2214) is formed around the step protrusion (2212), and the end face height of the support plate (2214) is not higher than that of the step protrusion (2212).

6. The brake assembly (2) according to claim 1, characterized in that The limiting structure is a boss (2125) on the cylindrical surface, and the boss (2125) is arranged close to the first spline portion (211).

7. The brake assembly (2) according to claim 6, characterized in that The mounting seat (22) is formed with a mounting hole (221) along a central axis, a circular arc surface (2211) is formed around the inner side of the mounting hole (221), the circular arc surface (2211) extends outward to form a step protrusion (2212), a protruding circular table (2213) is formed around the outer side of the mounting hole (221), the inner wall of the protruding circular table (2213) is attached to the first cylindrical surface (2121), and the step protrusion (2212) abuts against the limiting step surface (2123).

8. The brake assembly (2) according to any one of claims 1-7, characterized in that, The mounting seat (22) has a plurality of circumferential walls (222), an outer convex edge (2221) is arranged on the upper edge of at least one circumferential wall (222), and a reverse buckle (2222) is arranged on at least one circumferential wall (222).

9. The brake assembly (2) according to claim 8, characterized in that The angle between two adjacent peripheral walls (222) is provided with a limiting groove (2224), and the self-locking spring (23) is provided with a hook (231) outwardly protruding, wherein the hook (231) is embedded in the limiting groove (2224).

10. The brake assembly (2) according to claim 9, characterized in that The mounting seat (22) has four peripheral walls (222), and the upper edges of two opposite peripheral walls (222) are provided with outwardly protruding edges (2221), and the other two opposite peripheral walls (222) are provided with reverse buckles (2222).

11. The brake assembly (2) according to claim 10, characterized in that The peripheral wall (222) provided with the reverse buckle (2222) is further provided with an avoiding groove (2223), and the reverse buckle (2222) is provided obliquely upward along the bottom edge of the avoiding groove (2223).

12. The brake assembly (2) according to claim 4 or 7, characterized in that The height of the protruding circular table (2213) is 0.5-1.5 mm, and the thickness is 0.5-1.5 mm; the radian of the circular arc surface (2211) is 1-3 mm, and the height of the stepped protrusion (2212) is 0.1-0.3 mm.

13. A lifting column, comprising a mounting box (1), an inner tube assembly (3), an outer tube assembly (4), a brake assembly (2), a circular tube (5) and a lead screw (6), the mounting seat (22) of the brake assembly (2) is clamped with the mounting box (1); the inner tube assembly (3) is fixedly connected with the mounting box (1), the circular tube (5) is arranged in the inner tube assembly (3), one end of the circular tube (5) is connected with the brake assembly (2), the other end of the circular tube (5) is fixedly connected with a lead screw nut (7), the lead screw nut (7) is fixedly connected with the inner tube assembly (3), one end of the lead screw (6) passes through the lead screw nut (7) and is located in the circular tube (5), and the other end of the lead screw (6) is fixedly connected with the outer tube assembly (4); characterized in that The brake assembly (2) comprises a connecting piece (21), a mounting seat (22) and a self-locking spring (23), the connecting piece (21) comprises a first spline portion (211), a connecting portion (212) and a second spline portion (213) arranged in sequence, the connecting portion (212) comprises a cylindrical surface and a limiting structure, the mounting seat (22) is sleeved on the cylindrical surface on one side of the limiting structure and abuts against the limiting structure, so that the connecting piece (21) and the mounting seat (22) can rotate relative to each other in the circumferential direction; and the self-locking spring (23) is sleeved on the cylindrical surface on the other side of the limiting structure, and one end of the self-locking spring (23) is limited on the mounting seat (22).

14. The lift column of claim 13, wherein, The limiting structure is a boss (2125) on the cylindrical surface, and the boss (2125) is arranged close to the first spline portion (211).

15. The lift column of claim 14, wherein, The self-locking spring (23) is limited between the boss (2125) and the end face of the circular tube (5). The height of the protruding circular table (2213) is 0.5-1.5 mm, and the thickness is 0.5-1.5 mm; the radian of the circular arc surface (2211) is 1-3 mm, and the height of the stepped protrusion (2212) is 0.1-0.3 mm.

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