Self-locking worm transmission type clamp

Abstract

According to the self-locking worm transmission type clamp, looseness prevention of the clamp can be achieved, disassembly is convenient, and the clamp has reusability. According to the technical scheme, the belleville spring hoop comprises a hoop belt, a hoop shell, belleville spring assemblies and a worm, the belleville spring assemblies penetrate through the worm and are fixed to the hoop shell, one end of the hoop belt movably penetrates through a hoop base, a section of worm tooth groove is formed in the end of the hoop belt in the length direction, and the worm is inserted into the hoop shell and meshed with the worm tooth groove in the hoop belt; the hoop shell comprises an upper hoop shell and a lower hoop shell, a guiding device is arranged at the top of the upper hoop shell, and a locking plate is connected to the top of the hoop shell in a guiding mode through the guiding device; the locking plate can slide through external force; a locking disc is arranged on the head portion of the worm, first oblique teeth are arranged on the outer circumference of the locking disc, protruding second oblique teeth are correspondingly arranged on the inner side of the head portion of the locking plate, and the worm is prevented from reversing through meshing of the first oblique teeth and the protruding second oblique teeth.

Description

Technical Field

[0001] The invention relates to a clamp, in particular to a self-locking worm drive type clamp. Background Art

[0002] Worm drive clamps are widely used in various pipeline connection scenarios, especially in situations where frequent disassembly and installation are required. Worm drive clamps mainly rely on the mutual engagement of the teeth on the worm and the steel belt (or called the clamp belt). By rotating the worm, the teeth on the steel belt can be driven to move, thereby adjusting the tightness of the clamp.

[0003] Worm drive clamps are prone to loosening when used in a vibrating environment. Currently, clamps with anti-loosening function have become available.

[0004] Chinese patent publication number CN111578015A discloses an anti-loosening worm-driven clamp, which adopts double worm interlocking to achieve anti-loosening. When it is necessary to unlock / lock the above-mentioned worm-driven clamp, the unlocking seat is installed on the slide rail of the clamp shell, so that the sliding seat slides from the locking position to the unlocking position to achieve the locking or unlocking of the above-mentioned worm-driven clamp; the conception of this anti-loosening clamp is too complicated, the structure is too complex, the locking / unlocking process is complicated, the cost is high, and it is not suitable for popularization and use.

[0005] A Chinese patent with authorization announcement number CN207421040U discloses an anti-loosening worm drive clamp, including a clamp shell, a worm and a steel belt. The worm includes a worm head, a spiral section and a connecting section connected between the worm head and the spiral section. The clamp shell is provided with a limiting flange that limits the axial slippage of the worm and abuts against the connecting section. The outer surface of the connecting section is axially arranged with straight knurling. The limiting flange is provided with limiting convex teeth that are inserted into the straight knurling and limit the reversal of the worm. The setting of the limiting convex teeth and the straight knurling can effectively limit the reversal of the worm, improve the anti-loosening performance of the anti-loosening worm drive clamp, and enhance its fastening stability performance in a vibration environment. However, during the locking process, this type of clamp is prone to wear of the limiting convex teeth and the straight knurling, which may still cause the clamp to loosen easily. In addition, the limiting convex teeth are stuck in the straight knurling, which limits the reversal of the worm, making it difficult to disassemble the clamp and easily causing damage to the limiting convex teeth and the straight knurling, making the clamp not reusable. Summary of the invention

[0006] The invention provides a self-locking worm drive type clamp, which can prevent the clamp from loosening, has a simple structure, is easy to disassemble, and is reusable.

[0007] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a self-locking worm drive type clamp, comprising a band, a band shell, a disc spring assembly, and a worm, wherein the disc spring assembly is penetrated and fixed on the band shell by the worm, one end of the band can movably pass through the band seat and a worm tooth groove is arranged on this end along the length direction, the worm is inserted into the band shell and meshed with the worm tooth groove on the band; the disc spring assembly is composed of a plurality of disc springs, and the band shell comprises an upper band shell and a lower band shell; A guide device is provided on the top of the upper hoop shell, and a locking plate is connected to the top of the hoop shell through the guide device; the locking plate can slide by external force; The head of the worm is provided with a locking plate, the outer circumference of the locking plate is provided with a first oblique tooth, and the inner side of the head of the locking plate is correspondingly provided with a protruding second oblique tooth. The first oblique tooth and the protruding second oblique tooth are engaged with each other to limit the reverse rotation of the worm.

[0008] Furthermore, the structure of the guide device is provided with a relative outer flange at the top of the upper hoop shell, and the gap between the outer flange and the top of the upper hoop shell is the guide space of the locking plate. This structure is simple to set up, easy to manufacture, and can achieve the purpose of guiding connection.

[0009] Furthermore, the inclination direction of the first oblique tooth (on the locking plate) is the direction in which the worm is loosened, and the inclination direction of the second oblique tooth (on the locking plate) is set corresponding to the first oblique tooth. The inclination degrees of the first oblique tooth and the second oblique tooth can be between 15-75°. This setting can effectively prevent the worm from reversing (rotating counterclockwise).

[0010] Furthermore, the height of the first oblique teeth and the second oblique teeth is 0.4-1.5 mm.

[0011] Furthermore, the head of the locking plate has a certain elastic deformation capability, and the locking plate is made of metal material or engineering plastic.

[0012] The beneficial effects of the present invention are as follows: the present invention is provided with a locking plate and a locking disk, and when the worm is tightened clockwise, because the first oblique teeth on the locking disk at the head of the worm and the second oblique teeth on the inner side of the locking plate have opposite tooth directions, and the locking plate has elastic deformation ability; therefore, the worm can be tightened while the locking plate continuously jumps up and down as long as it overcomes the friction force of the contact between the two oblique teeth; when the worm is to rotate counterclockwise, because the oblique teeth at the end of the worm are counterclockwise, they just mesh with the oblique teeth on the locking plate, thus realizing the self-locking function; when we need to remove the clamp, the locking plate is pushed backward to separate the locking plate from the worm; the present invention can prevent the clamp from loosening, has a simple structure, is easy to disassemble, and the clamp is reusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1is a stereogram of the present invention; Figure 2 is a structural diagram of the locking plate in the present invention; Figure 3 is a structural diagram of the locking disk in the present invention; Figure 4 It is a structural diagram of the worm in the present invention; Figure 5 Structural diagram of the hoop shell in the present invention.

[0014] As shown in the figure: 1. worm, 101. anti-rotation fitting shaft, 2. disc spring assembly, 3. hoop shell, 301. upper hoop shell, 302. lower hoop shell, 303. inner guide plate, 4. outer flange, 5. locking plate, 501. second oblique tooth, 6. locking plate, 601. first oblique tooth, 602. anti-rotation fitting hole, 7. hoop belt. DETAILED DESCRIPTION

[0015] The technical solution of a self-locking worm rotating clamp of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0016] like Figure 1-Figure 5 As shown, a self-locking worm drive type clamp comprises a band 7, a band shell 3, a disc spring assembly 2, and a worm. The disc spring assembly 2 is penetrated by a worm 1 and fixed on the band shell 3. One end of the band 7 can movably pass through the band seat and a worm tooth groove is provided on this end along the length direction. The worm is inserted into the band shell and engages with the worm tooth groove on the band. The disc spring assembly 2 is composed of multiple groups of disc springs (prior art). The band shell 3 comprises an upper band shell 301 and a lower band shell 302 (prior art). In the prior art, an inner guide plate 303 can also be fixed on the lower band shell 302 to further provide circumferential guidance for the band. A guide device is provided at the top of the upper hoop shell 301, and a locking plate 5 is connected to the top of the hoop shell through the guide device; the locking plate can slide by external force; The head of the worm is provided with a locking plate 6, and the outer circumference of the locking plate is provided with a first oblique tooth 601, and the inner side of the head of the locking plate 5 is correspondingly provided with a protruding second oblique tooth 505. The first oblique tooth 601 is engaged with the protruding second oblique tooth 501 to limit the reversal of the worm.

[0017] Combination Figure 1 , Figure 5 As shown, the structure of the guide device is provided with a relative outer flange 4 at the top of the upper hoop shell, and the gap between the outer flange 4 and the top of the upper hoop shell 301 is the guide space of the locking plate. This structure is simple to set up, easy to manufacture, and can achieve the purpose of guiding connection.

[0018] Combination Figure 2 , Figure 3As shown, the inclination direction of the first oblique tooth 601 (on the locking plate) is the direction in which the worm is loosened, and the inclination direction of the second oblique tooth (on the locking plate) is set corresponding to the first oblique tooth. The inclination degrees of the first oblique tooth and the second oblique tooth can be between 15-75°. This setting can effectively prevent the worm from reversing (rotating counterclockwise).

[0019] Combination Figure 3 , Figure 4 As shown, a locking plate 6 is provided at the head of the worm, and the connection structure between the two is: an anti-rotation fitting hole 601 is provided on the locking plate 6, and an anti-rotation fitting shaft 101 is provided at the head of the worm. The anti-rotation fitting shaft 101 is interference fit with the anti-rotation fitting hole 601 to realize the connection between the locking plate 6 and the worm 1.

[0020] Furthermore, the height of the first oblique teeth and the second oblique teeth is 0.4-1.5 mm.

[0021] Furthermore, the head of the locking plate has a certain elastic deformation capability, and the locking plate is made of metal material or engineering plastic.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any simple modifications, equivalent substitutions, improvements, etc. made within the technical concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-locking worm drive clamp, comprising a band, a band housing, a disc spring assembly, and a worm, wherein the disc spring assembly is penetrated and fixed to the band housing by the worm, one end of the band can movably pass through the band seat and a worm tooth groove is provided on the end along the length direction, the worm is inserted into the band housing and engages with the worm tooth groove on the band; the disc spring assembly is composed of a plurality of disc springs, the band housing comprises an upper band housing and a lower band housing, and is characterized in that: A guide device is provided on the top of the upper hoop shell, and a locking plate is connected to the top of the hoop shell through the guide device; the locking plate can slide by external force; The head of the worm is provided with a locking plate, the outer circumference of the locking plate is provided with a first oblique tooth, and the inner side of the head of the locking plate is correspondingly provided with a protruding second oblique tooth. The first oblique tooth and the protruding second oblique tooth are engaged with each other to limit the reverse rotation of the worm.

2. A self-locking worm drive clamp according to claim 1, characterized in that: The structure of the guide device is that a relative outer flange is arranged on the top of the upper hoop shell, and the gap between the outer flange and the top of the upper hoop shell is the guide space of the locking plate.

3. A self-locking worm drive clamp according to claim 1 or 2, characterized in that: The inclination direction of the first oblique tooth 601 is the direction in which the worm is loosened, and the inclination direction of the second oblique tooth is set corresponding to the first oblique tooth. The inclination degrees of the first oblique tooth and the second oblique oblique tooth are between 15-75°.

4. A self-locking worm drive clamp according to claim 3, characterized in that: The height of the first oblique teeth and the second oblique teeth is 0.4-1.5 mm.

5. A self-locking worm drive clamp according to claim 1, 2 or 4, characterized in that: The head of the locking plate has a certain elastic deformation ability, and the locking plate is made of metal material or engineering plastic.

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