阅读说明：本技术 具有输出轴防转组件的砂轮装置 (Grinding wheel device with output shaft rotation-proof assembly ) 是由 张旭斌 于 2020-11-26 设计创作，主要内容包括：本发明公开了具有输出轴防转组件的砂轮装置,包括电动机、砂轮和防护罩,防护罩通过连接机构固定在电动机的外壳上,连接机构包括连接组件、摩擦组件和解锁组件,连接组件包括法兰环、支撑套以及多个将支撑套和法兰环连接固定的及紧固件；摩擦组件位于支撑套内侧,其包括底板和摩擦单元,摩擦单元包括滑动安装在底板上的摩擦件以及两端分别与摩擦件以及底板连接的弹簧；解锁组件包括径向插装在支撑套上的直线驱动机构以及安装在直线驱动机构驱动端的插块。本发明在砂轮机在检修等试机时,设定了必须安装上防护罩才能进行试机的条件,从而保证了相关工作人员必须按照规程进行操作,有效地避免了砂轮机试机时存在的操作不规范而导致的安全问题。(The invention discloses a grinding wheel device with an output shaft anti-rotation component, which comprises a motor, a grinding wheel and a protective cover, wherein the protective cover is fixed on a shell of the motor through a connecting mechanism, the connecting mechanism comprises a connecting component, a friction component and an unlocking component, and the connecting component comprises a flange ring, a supporting sleeve and a plurality of fasteners for connecting and fixing the supporting sleeve and the flange ring; the friction assembly is positioned on the inner side of the support sleeve and comprises a bottom plate and a friction unit, and the friction unit comprises a friction piece which is slidably arranged on the bottom plate and a spring of which two ends are respectively connected with the friction piece and the bottom plate; the unlocking assembly comprises a linear driving mechanism which is radially inserted on the support sleeve and an insertion block which is arranged at the driving end of the linear driving mechanism. According to the invention, when the grinder is tested for maintenance and the like, the condition that the grinder can be tested only by installing the protective cover is set, so that the relevant workers can operate according to the rules, and the safety problem caused by the non-standard operation of the grinder during the test is effectively avoided.)

1. Grinding wheel device with subassembly is prevented changeing by output shaft, including motor (1), coaxial arrangement grinding wheel (3) on transmission shaft (2) of motor (1) and fix on motor (1) shell and cover protection casing (4) of establishing one side of grinding wheel (3), its characterized in that: the protective cover (4) is fixed on the shell of the motor (1) through a connecting mechanism, the connecting mechanism comprises a connecting component, a friction component and an unlocking component, wherein,

the connecting assembly comprises a flange ring (5) sleeved on a shell of the motor (1), a supporting sleeve (6) sleeved on the transmission shaft (2) and connected with the protective cover (4) at one end and abutted against the flange ring (5) at the other end, and a plurality of fasteners (7) for connecting and fixing the supporting sleeve (6) and the flange ring (5);

the friction assembly is positioned on the inner side of the support sleeve (6) and comprises a bottom plate (8) which is sleeved on the transmission shaft (2) and fixed on the shell of the motor (1) and a friction unit which is arranged on the bottom plate (8) in a sliding mode along the radial direction of the transmission shaft (2), the friction unit comprises a friction piece which is arranged on the bottom plate (8) in a sliding mode and a spring (9) of which the two ends are respectively connected with the friction piece and the bottom plate (8), the axis of the spring (9) is parallel to the sliding direction of the friction piece, and the friction piece can be abutted against the outer circumferential surface of the transmission shaft (2) under the deformation effect of the spring (9;

the number of the friction units is two, and the two friction units are symmetrical along the axis center of the transmission shaft 2;

the unlocking assembly comprises a linear driving mechanism and an inserting block (14), wherein the linear driving mechanism is radially inserted on the supporting sleeve (6), the inserting block (14) is installed at the driving end of the linear driving mechanism, the inserting block (14) is of an isosceles triangular prism structure, one side wall A of the inserting block is connected with the driving end, an included angle A opposite to the side wall A faces to a gap between the friction units, the included angle A of the inserting block can be inserted between the two friction units under the driving of the linear driving mechanism, and the two friction units can be mutually far away under the pushing of inclined planes on two sides of the included angle A.

2. The grinding wheel device with an output shaft rotation prevention assembly according to claim 1, characterized in that: the linear driving mechanism comprises an internal thread cylinder (10) which is radially inserted on the supporting sleeve (6), and a screw rod (11), a bearing (12) and a moving rod (13) which are sequentially and coaxially connected, wherein the screw rod (11) is positioned on one side of the internal thread cylinder (10) far away from the transmission shaft (2), one end of the screw rod (11) is inserted into the internal thread cylinder (10) and is in threaded connection with the internal thread cylinder (10), the moving rod (13) is positioned on one side of the internal thread cylinder (10) close to the transmission shaft (2), one end of the moving rod is connected with an insertion block (14), the other end of the moving rod is inserted into an inner hole of the internal thread cylinder (10) and is connected with the screw rod (11) through the bearing (12), and the inner ring and the outer ring of the bearing (12) are;

a sliding groove A (15) is formed in the side wall of the moving rod (13) along the axis of the moving rod, a limiting plate (16) is arranged on the inner wall of the internal thread cylinder (10), one end of the limiting plate (16) is connected with the internal thread cylinder (10), and the other end of the limiting plate is matched with the sliding groove A (15).

3. The grinding wheel device with an output shaft rotation prevention assembly according to claim 2, characterized in that: and a handle (23) is arranged at one end of the screw rod (10) far away from the bearing (12), the axis of the handle (23) is vertical to the axis of the screw rod (10), and the central part of the side wall of the handle is connected with the screw rod (10).

4. The grinding wheel device with an output shaft rotation prevention assembly according to claim 1, characterized in that: the bottom plate (8) is provided with a sliding groove B (17), the axis of the sliding groove B (17) is vertically intersected with the axis of the transmission shaft (2), one side of the friction piece, which is close to the bottom plate (8), is protruded outwards to form a sliding block (18), and the sliding block (18) is inserted into the sliding groove B (17) and is in sliding fit with the sliding groove B.

5. The grinding wheel device with an output shaft rotation prevention assembly according to claim 4, characterized in that: the one end of keeping away from transmission shaft (2) on spout B (17) is the blind end, spring (9) are arranged in spout B (17) to be arranged in one side that transmission shaft (2) were kept away from in slider (18), its both ends are connected with the one end of keeping away from transmission shaft (2) on slider (18) and spout B (17) respectively.

6. The grinding wheel device with an output shaft rotation prevention assembly according to claim 1, characterized in that: the friction piece comprises a rib plate (19), a friction plate (20) and a friction plate (21) which are sequentially connected, the bottom of the rib plate (19) is connected with the bottom plate (8) in a sliding mode, one side, far away from the friction plate (20), of the friction plate (21) is recessed inwards to form a cylindrical arc-shaped surface, and the outer circumferential surface of the transmission shaft (2) can be internally tangent to the inner recessed surface of the friction plate (21) under the deformation effect of the spring (9).

7. The grinding wheel device with an output shaft rotation prevention assembly according to claim 1, characterized in that: the unlocking assemblies are two and distributed along the axial center of the transmission shaft (2).

8. The grinding wheel device with an output shaft rotation prevention assembly according to claim 1, characterized in that: the included angle A department of inserted block (14) is provided with axis and the parallel supplementary inserted block (22) of the axis of inserted block (14), supplementary inserted block (22) are isosceles triangular prism structure, and one of them lateral wall B is connected with inserted block (14), and the relative included angle B of its upper and lateral wall B is less than included angle A.

Technical Field

The invention relates to the field of grinding machines, in particular to a grinding wheel device with an output shaft anti-rotation assembly.

Background

Grinders are common devices used to sharpen various knives and tools. It is mainly composed of a base, a grinding wheel, a motor or other power sources as power sources, a bracket, a protective cover, a water feeder and the like. The motor is installed on the base, and the emery wheel sets up in the transmission shaft of motor end. One side of the grinding wheel is sleeved with a protective cover, and the protective cover is arranged on the shell of the grinding machine base.

When the grinding wheel works, the grinding wheel grinds the part, and grinding dust generated in the grinding process makes parabolic motion under the rotating moment from the grinding wheel and adheres to the inner side of the protective cover to prevent the grinding dust from splashing to the body of a worker, particularly eyes.

When the grinding machine fails, the protective cover, the grinding wheel and other parts need to be detached for troubleshooting. And after the fault is eliminated, the grinding wheel is installed back to the transmission shaft. At the moment, the grinding machine needs to be started, so that the grinding machine is tested to detect whether the grinding machine works normally or not, and the rotation stability, the grinding performance and the like of the grinding wheel are tested. When the grinding machine is tested, if the problem still exists, the grinding machine needs to be disassembled, cleared, reloaded and tested. Some maintainers feel that the operation of repeatedly disassembling and assembling the grinding machine and testing the grinding machine is troublesome, and usually, the grinding machine is directly tested without installing a protective cover when faults are eliminated and the grinding machine is assembled. The danger degree of direct machine trial without the protective cover is extremely high, for example, the strength and the quality of a newly replaced grinding wheel have problems, the grinding wheel blocks separated and broken by centrifugal force strike the bodies of surrounding workers, and fragments are splashed to eyes of people during grinding. Therefore, a device for preventing workers from operating illegally needs to be designed for a grinder so as to ensure the operation compliance of related workers and ensure the personal safety of the related workers.

Disclosure of Invention

The invention aims to: the utility model provides a grinding wheel device with output shaft prevents changeing the subassembly, has solved current abrasive machine when examination machines such as maintenance, because of the suspected trouble of relevant staff and the safety problem that the operation leads to in violation of rules and regulations.

The technical scheme adopted by the invention is as follows:

the grinding wheel device with the anti-rotation component of the output shaft comprises a motor, a grinding wheel coaxially arranged on a transmission shaft of the motor and a protective cover fixed on a shell of the motor and covering one side of the grinding wheel, wherein the protective cover is fixed on the shell of the motor through a connecting mechanism, the connecting mechanism comprises a connecting component, a friction component and an unlocking component, wherein,

the connecting assembly comprises a flange ring sleeved on a shell of the motor, a supporting sleeve sleeved on the transmission shaft, one end of the supporting sleeve is connected with the protective cover, the other end of the supporting sleeve is abutted against the flange ring, and a plurality of fasteners for connecting and fixing the supporting sleeve and the flange ring;

the friction assembly is positioned on the inner side of the support sleeve and comprises a bottom plate which is sleeved on the transmission shaft and fixed on the motor shell and a friction unit which is arranged on the bottom plate in a sliding mode along the radial direction of the transmission shaft, the friction unit comprises a friction piece which is arranged on the bottom plate in a sliding mode and a spring of which the two ends are respectively connected with the friction piece and the bottom plate, the axis of the spring is parallel to the sliding direction of the friction piece, and the friction piece can be abutted against the outer circumferential surface of the transmission shaft under the deformation action of the spring;

the number of the friction units is two, and the two friction units are centrosymmetric along the axis of the transmission shaft;

the unlocking assembly comprises a linear driving mechanism and an inserting block, wherein the linear driving mechanism is radially inserted on the supporting sleeve, the inserting block is installed at the driving end of the linear driving mechanism, the inserting block is of an isosceles triangular prism structure, one side wall A of the inserting block is connected with the driving end, an included angle A opposite to the side wall A faces to a gap between the friction units, under the driving of the linear driving mechanism, the included angle A of the inserting block can be inserted between the two friction units, and the two friction units can be mutually far away under the pushing of inclined planes on two sides of the included angle A.

Furthermore, the linear driving mechanism comprises an internal thread cylinder which is radially inserted on the support sleeve, and a screw rod, a bearing and a movable rod which are sequentially and coaxially connected, wherein the screw rod is positioned on one side of the internal thread cylinder, which is far away from the transmission shaft, one end of the screw rod is inserted into the internal thread cylinder and is in threaded connection with the internal thread cylinder, the movable rod is positioned on one side of the internal thread cylinder, which is close to the transmission shaft, one end of the movable rod is connected with the insert block, the other end of the movable rod is inserted into an inner hole of the internal thread cylinder and is connected with the screw rod through the bearing;

the side wall of the moving rod is provided with a sliding groove along the axis of the moving rod, the inner wall of the internal thread cylinder is provided with a limiting plate, one end of the limiting plate is connected with the internal thread cylinder, and the other end of the limiting plate is matched with the sliding groove.

Furthermore, a handle is arranged at one end, far away from the bearing, of the screw rod, the axis of the handle is perpendicular to that of the screw rod, and the central part of the side wall of the handle is connected with the screw rod.

Furthermore, a sliding groove is formed in the bottom plate, the axis of the sliding groove is perpendicular to the axis of the transmission shaft, a sliding block protrudes out of one side, close to the bottom plate, of the friction piece, and the sliding block is inserted into the sliding groove and is in sliding fit with the sliding block.

Furthermore, the one end of keeping away from the transmission shaft on the spout is the blind end, the spring is arranged in the spout to be located the slider and keep away from one side of transmission shaft, its both ends are connected with the slider and the one end of keeping away from the transmission shaft on the spout respectively.

Furthermore, the friction piece comprises a rib plate, a friction plate and a friction plate which are sequentially connected, the bottom of the rib plate is connected with the bottom plate in a sliding mode, one side, far away from the friction plate, of the friction plate is recessed inwards to form a cylindrical arc surface, and the outer circumferential surface of the transmission shaft can be internally tangent to the recessed surface of the friction plate under the deformation effect of the spring.

Further, the unlocking assemblies are two in number and distributed along the axial center of the transmission shaft.

Furthermore, an auxiliary inserting block with an axis parallel to the axis of the inserting block is arranged at the included angle A of the inserting block, the auxiliary inserting block is of an isosceles triangular prism structure, one side wall B of the auxiliary inserting block is connected with the inserting block, and the included angle B opposite to the side wall B is smaller than the included angle A.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the invention relates to a grinding wheel device with an output shaft anti-rotation component.A friction component for preventing a transmission shaft from smoothly rotating is arranged on a motor shell, and the friction component is unlocked based on a linear driving mechanism which is connected with a protective cover into a whole; therefore, when the protective cover is not installed, the friction assembly can be abutted against the outer circumferential surface of the transmission shaft under the deformation action of the spring, and even if the motor is started at the moment, the transmission shaft cannot normally rotate and cannot perform test operation on the basis of the abutted friction force; in order to test the machine, the protective cover must be installed on the grinding wheel, the driving insert block of the linear driving mechanism is inserted between the two friction units, so that the friction units are far away from each other, the friction units are separated from the transmission shaft, and then the friction force of the friction assembly on the transmission shaft is unlocked, so that the transmission shaft can smoothly rotate, and the related machine testing operation is performed. Therefore, when the grinder is tested for overhaul and the like, the condition that the grinder can be tested only by installing the protective cover is set, so that the relevant workers can operate according to the rules, and the safety problem caused by the fact that the operation is not standard when the grinder is tested is effectively avoided;

2. according to the grinding wheel device with the output shaft anti-rotation assembly, the auxiliary insert block is mainly used for enabling the inclined surface of the insert block to abut against the two friction units to serve as a guide function, and the auxiliary insert block with the smaller included angle is inserted between the two friction units in advance, so that the insert block can be inserted between the two friction units more conveniently in a labor-saving mode, and the convenience in operation is improved.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment will be briefly described below, and it should be understood that the proportional relationship of each component in the drawings in this specification does not represent the proportional relationship in the actual material selection design, and is only a schematic diagram of the structure or the position, in which:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic view of the friction member contacting the drive shaft;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a schematic view of the sliding chute A being engaged with the limiting plate;

fig. 6 is a schematic structural view of the linear drive mechanism.

Reference numerals in the drawings indicate:

the method comprises the following steps of 1-a motor, 2-a transmission shaft, 3-a grinding wheel, 4-a protective cover, 5-a flange ring, 6-a support sleeve, 7-a fastener, 8-a bottom plate, 9-a spring, 10-an internal thread cylinder, 11-a screw rod, 12-a bearing, 13-a moving rod, 14-an insert block, 15-a chute A, 16-a limiting plate, 17-a chute B, 18-a slide block, 19-a rib plate, 20-a friction plate, 21-a friction plate, 22-an auxiliary insert block, 23-a handle, 24-a bolt through hole and 25-a abdicating inclined plane.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

The present invention will be described in detail with reference to fig. 1 to 6.

Example 1

As shown in fig. 1 to 6, the grinding wheel device with an output shaft rotation prevention assembly of the present invention includes a motor 1, a grinding wheel 3 coaxially mounted on a transmission shaft 2 of the motor 1, and a protective cover 4 fixed on a housing of the motor 1 and covering one side of the grinding wheel 3, wherein the protective cover 4 is fixed on the housing of the motor 1 by a connection mechanism, the connection mechanism includes a connection assembly, a friction assembly and a unlocking assembly, wherein,

the connecting assembly comprises a flange ring 5 sleeved on a shell of the motor 1, a support sleeve 6 sleeved on the transmission shaft 2, one end of the support sleeve is connected with the protective cover 4, the other end of the support sleeve is abutted against the flange ring 5, and a plurality of fasteners 7 for connecting and fixing the support sleeve 6 and the flange ring 5;

the friction assembly is positioned on the inner side of the support sleeve 6 and comprises a bottom plate 8 which is sleeved on the transmission shaft 2 and fixed on the shell of the motor 1 and a friction unit which is arranged on the bottom plate 8 in a sliding mode along the radial direction of the transmission shaft 2, the friction unit comprises a friction piece which is arranged on the bottom plate 8 in a sliding mode and a spring 9 of which two ends are respectively connected with the friction piece and the bottom plate 8, the axis of the spring 9 is parallel to the sliding direction of the friction piece, and the friction piece can be abutted against the outer circumferential surface of the transmission shaft 2 under the deformation action of the spring;

the number of the friction units is two, and the two friction units are symmetrical along the axis center of the transmission shaft 2;

the unlocking assembly comprises a linear driving mechanism and an inserting block 14, wherein the linear driving mechanism is radially inserted on the supporting sleeve 6, the inserting block 14 is installed at the driving end of the linear driving mechanism, one side wall A of the inserting block is connected with the driving end, an included angle A opposite to the side wall A faces to a gap between the friction units, the included angle A of the inserting block can be inserted between the two friction units under the driving of the linear driving mechanism, and the two friction units can be mutually far away under the pushing of inclined planes on two sides of the included angle A.

When the grinding machine fails, the connecting mechanism, the grinding wheel and other parts are disassembled to remove the failure; after the fault is eliminated, the installation is carried out according to the following steps:

s1, coaxially installing the grinding wheel 3 on the transmission shaft 2 of the motor 1;

s2, the support sleeve 6 penetrates through the grinding wheel 3 and then is sleeved on the transmission shaft 2 and is positioned between the shell of the motor 1 and the grinding wheel;

s3, connecting the support sleeve 6 and the flange ring 5 by using a fastener 7, so as to cover the protective cover on the grinding wheel;

s4, operating the unlocking assembly on the support sleeve 6 to enable the included angle A of the insertion block to be inserted between the two friction units, and enabling the two friction units to be away from each other under the pushing of the inclined planes on the two sides of the included angle A, so that the friction of the friction units on the transmission shaft 2 is removed, the transmission of the transmission shaft 2 is facilitated, and the subsequent related trial run operation is favorably carried out smoothly.

In the invention, a friction component for preventing the transmission shaft 2 from smoothly rotating is arranged on the motor shell, and the friction component is unlocked based on a linear driving mechanism which is connected with the protective cover into a whole structure; therefore, when the protective cover is not installed, the friction assembly can be abutted against the outer circumferential surface of the transmission shaft 2 under the deformation action of the spring, and even if the motor is started at the moment, the transmission shaft cannot normally rotate and cannot perform test operation based on the abutted friction force; in order to test the machine, the protective cover must be mounted on the grinding wheel, and the driving insert of the linear driving mechanism is inserted between the two friction units to separate the friction units from each other, so as to separate from the contact with the transmission shaft 2, and then the friction force of the friction assembly to the transmission shaft 2 is unlocked, so that the transmission shaft can smoothly rotate, and the relevant test operation can be performed. Therefore, when the grinder is tested for maintenance and the like, the condition that the grinder can be tested only by installing the protective cover is set, so that the relevant workers can operate according to the rules, and the safety problem caused by the fact that the operation is not standard when the grinder is tested is effectively avoided.

The fastening piece 7 is preferably a bolt, one end of the support sleeve 6, which is far away from the flange ring 5, protrudes outwards to form an outwards-turned edge, the tail end of the rod part of the bolt movably penetrates through the outwards-turned edge and then is in threaded connection with the flange ring 5, and the flange ring 5 can be screwed on the motor or fixed in a riveting mode, a welding mode and the like.

Two friction units can adopt the contained angle A male clearance of the inserted block of being convenient for of keeping in, perhaps direct contact between two friction units, and one side that transmission shaft 2 axis was kept away from to its contact surface all sets up the inclined plane 23 of stepping down, and the interval between the inclined plane 23 of stepping down is along with keeping away from transmission shaft 2 crescent, forms a V-arrangement groove body structure that supplies contained angle A male between the inclined plane 23 of stepping down like this.

Example 2

This embodiment is described with respect to the linear drive mechanism in embodiment 1.

As shown in fig. 2, the linear driving mechanism includes an internal thread cylinder 10 radially inserted into the support sleeve 6, and a screw 11, a bearing 12 and a moving rod 13 coaxially connected in sequence, as shown in fig. 6, the screw 11 is located on one side of the internal thread cylinder 10 away from the transmission shaft 2, one end of the screw is inserted into the internal thread cylinder 10 and is in threaded connection with the internal thread cylinder 10, the moving rod 13 is located on one side of the internal thread cylinder 10 close to the transmission shaft 2, one end of the moving rod is connected with an insert block 14, the other end of the moving rod is inserted into an inner hole of the internal thread cylinder 10 and is connected with the screw 11 through the bearing 12, and an inner ring and an outer ring of the bearing 12 are respectively;

a sliding groove a15 is formed on the side wall of the moving rod 13 along the axis thereof, a limit plate 16 is arranged on the inner wall of the internally threaded cylinder 10, one end of the limit plate 16 is connected with the internally threaded cylinder 10, and the other end thereof is matched with a sliding groove a15, as shown in fig. 5.

The internally threaded cylinder 10 may be welded or riveted to the support sleeve 6.

In the present invention, when the insert block needs to be inserted between the two friction components, the screw 11 is rotated, so that the moving rod 13 advances toward the transmission shaft 2 in the axial direction, and due to the limitation of the bearing 12 and the sliding groove a15 and the limit plate 16, the moving rod 13 advances without rotating only under the action of the screw 11, so as to ensure that the included angle a is opposite to the gap of the opposite surface between the two friction components, and then the included angle a is stably inserted between the two friction components.

When the protective sleeve needs to be taken down, the screw rod 11 is rotated reversely, so that the insert block is withdrawn from between the two friction components until the minimum distance between the insert block and the transmission shaft 2 is larger than the radius of the grinding wheel.

Furthermore, a handle 23 is arranged at one end of the screw 10 far away from the bearing 12, the axis of the handle 23 is perpendicular to the axis of the screw 10, and the central part of the side wall of the handle is connected with the screw 10. The handle 23 is arranged to facilitate the rotation of the screw rod, so that the labor is saved and the convenience is realized.

Example 3

The present embodiment is further described with respect to the sliding fit between the friction member and the base plate 8.

As shown in fig. 1 and 2, a sliding groove B17 is provided on the bottom plate 8, the axis of the sliding groove B17 is perpendicular to the axis of the transmission shaft 2, a sliding block 18 is protruded from one side of the friction piece close to the bottom plate 8, and the sliding block 18 is inserted into and slidably engaged with the sliding groove B17.

Furthermore, one end of the sliding groove B17, which is far away from the transmission shaft 2, is a closed end, the spring 9 is located in the sliding groove B17 and located on one side of the sliding block 18, which is far away from the transmission shaft 2, and two ends of the spring are respectively connected with the sliding block 18 and one end of the sliding groove B17, which is far away from the transmission shaft 2.

Correspondingly, when the spring is positioned on one side of the sliding block close to the transmission shaft 2, the friction piece can be abutted against the outer circumferential surface of the transmission shaft 2 under the stretching deformation action of the spring.

Example 4

The friction member is embodied as follows: the friction piece comprises a rib plate 19, a friction plate 20 and a friction plate 21 which are sequentially connected, the bottom of the rib plate 19 is connected with the bottom plate 8 in a sliding mode, one side, far away from the friction plate 20, of the friction plate 21 is concave inwards to form a cylindrical arc surface, and the outer circumferential surface of the transmission shaft 2 can be internally tangent to the concave surface of the friction plate 21 under the deformation effect of the spring 9.

The outer circumferential surface of the transmission shaft 2 is internally tangent to the concave surface of the friction plate 21, so that the contact surface between the transmission shaft 2 and the friction assembly is increased, the friction force between the transmission shaft 2 and the friction assembly is increased, and the stability of the locking state of the friction plate assembly to the transmission shaft 2 is effectively ensured.

Preferably, there are two unlocking assemblies, distributed along the axial center of the transmission shaft 2, as shown in fig. 2.

Example 5

An auxiliary insertion block 22 with an axis parallel to the axis of the insertion block 14 is arranged at the included angle a of the insertion block 14, the auxiliary insertion block 22 is in an isosceles triangular prism structure, one side wall B of the auxiliary insertion block is connected with the insertion block 14, and the included angle B opposite to the side wall B is smaller than the included angle a.

The auxiliary insert 22 mainly serves as a guide for the two friction units against which the inclined surfaces of the insert 14 abut, and the insert 14 can be inserted between the two friction units more easily and conveniently by inserting the auxiliary insert 22 having a smaller included angle between the two friction units in advance, thereby improving the convenience of operation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.