Oil pressure pull-down tensioner

Abstract

According to the scheme, the oil pressure pull-down tensioner comprises a shell, a through hole for installing a piston is formed in the shell, and a tightening belt and an arc-shaped sliding groove part are arranged at an opening in the top of the through hole; a pull rod is arranged at the top of the piston, and a plurality of movably connected clamping teeth are arranged on the side face of the pull rod; when the pull rod moves downwards along with the piston, the bottoms of the clamping teeth on the pull rod can slide on the arc-shaped sliding groove part so that the tops of the clamping teeth can be opened. When the pull rod moves upwards along with the piston, the clamping teeth on the pull rod can slide on the arc-shaped sliding groove part so that the tops of the clamping teeth can be folded. The elastic reset piece is arranged between the piston and the shell; wherein the tightening belt is used for limiting and supporting the opening angle of the clamping teeth. The device has the advantages of controllability, stability, adaptability and the like, and is suitable for various application scenes needing to adjust and maintain the fastening state.

Description

Technical Field

[0001] The present application relates to a tensioning tool, in particular to an oil pressure pull-down tensioner. Background Art

[0002] Most common tensioning tools use a steel ball and a spiral groove to make the steel ball slide on the spiral groove, thereby clamping the workpiece. However, this method requires high precision in the installation of the steel ball and is relatively complicated to assemble. The steel ball may fall off during the assembly process or during use. Therefore, it is necessary to design a hydraulic pull-down tensioner with a simpler structure that does not require a steel ball. Utility Model Content

[0003] The purpose of this application is to provide an oil pressure pull-down tensioner to address the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above application purpose, the present application adopts the following technical solution: the hydraulic pull-down tensioner includes:

[0005] The housing is provided with a through hole for installing the piston, and a tightening belt and an arc-shaped slide groove are provided at the top opening of the through hole;

[0006] The piston has a pull rod on the top, and a plurality of movably connected clamping teeth are provided on the side of the pull rod; when the pull rod moves downward with the piston, the bottom of the clamping teeth on the pull rod can slide on the arc-shaped slide groove so that the top of the clamping teeth is opened; when the pull rod moves upward with the piston, the clamping teeth on the pull rod can slide on the arc-shaped slide groove so that the top of the clamping teeth is closed;

[0007] An elastic return member is arranged between the piston and the housing;

[0008] The tightening belt is used to limit and support the opening angle of the clamping teeth.

[0009] Working principle and beneficial effects: 1. Compared with the prior art, the present application drives the pull rod to descend by the piston, so that the pull rod drives the clamping teeth to descend. During the descent process, the bottom of the clamping teeth will cooperate with the arcuate slide groove part of the arcuate slide groove part and slide on the arcuate slide groove, so that the top of the clamping teeth is opened. During this process, the tightening belt can limit and support the middle position of the clamping teeth, and play the effect of a fulcrum and a supporting point, which is equivalent to the top of the clamping teeth being tilted, so that the tightening operation of the inner hole of the workpiece can be achieved; when the piston is released, under the action of the elastic reset part, the pull rod drives the tooth part to rise, and the bottom of the clamping teeth will cooperate with the arcuate slide groove part of the arcuate slide groove part and slide in the opposite direction on the arcuate slide groove, so that the top of the clamping teeth is closed. At this time, the tightening belt can still abut against the side wall of the clamping teeth to support the clamping teeth.

[0010] 2. By providing a movable clamping tooth on the piston, the opening angle of the clamping tooth can be controlled. This design allows the top of the clamping tooth to be affected by the arc-shaped slide groove and open or close respectively when the piston moves up or down. The presence of the elastic reset member helps to reset the tensioner during use. In this way, once the external force or pressure is reduced, the elastic reset member can push the piston back to the initial position to ensure the normal operation of the tensioner. The tightening belt is designed to limit the opening angle of the clamping teeth, which helps to ensure that the tensioner remains stable during use. At the same time, the tightening belt also plays a role in supporting the clamping teeth, increasing the stability of the clamping teeth. The structure is relatively simple, including basic components such as the housing, the piston, and the elastic reset member. Steel balls are no longer required, and the clamping teeth not only have a good clamping effect compared to steel balls, but are also easier to limit and less likely to fall off. This makes the tensioner relatively easy to manufacture and has good maintainability.

[0011] Furthermore, the number of the clamping teeth is at least two, and they are evenly spaced along the circumference of the pull rod, so that better clamping force can be provided, and the force on the clamping teeth can be evenly applied, thereby increasing the service life.

[0012] Furthermore, each clamping tooth comprises a tooth portion and a slider disposed below the tooth portion, and a fitting surface is disposed on the side of the slider facing the arc-shaped slide groove portion. The fitting surface on the slider can cooperate with the arc-shaped slide groove portion to achieve the opening and closing functions of the clamping tooth, that is, the arc-shaped slide groove portion cooperates with the fitting surface to achieve the guiding effect on the clamping tooth.

[0013] Furthermore, the pull rod is provided with an inclined surface that matches the tooth part, and the back of the tooth shape of the tooth part is provided with a slope that matches the inclined surface. In this way, the stroke of opening and closing the tooth part can be shortened, and the tooth part can achieve the tightening (clamping) function at a smaller opening angle, reducing the design difficulty of the clamping teeth.

[0014] Furthermore, the tightening belt is provided with an inclined limiting rib. The limiting rib of the tightening belt is a circle, so it can limit and support the clamping teeth while ensuring sufficient strength, and the inclined structural setting can prevent interference with the sharp parts of the clamping teeth during the sliding process, reducing the occurrence of jamming.

[0015] Furthermore, the pull rod cooperates with the elastic reset member through a spring cover, the top of the spring cover abuts against the bottom of the arc-shaped slide groove portion, and the bottom abuts against the top of the elastic reset member. The elastic reset member can be conveniently installed using the spring cover.

[0016] Furthermore, the arc-shaped slide groove part, the spring cover and the side of the pull rod are provided with a gap, so that the pull rod can slide smoothly, thereby providing a movable space for the bottom of the clamping teeth.

[0017] Furthermore, a piston sleeve is provided between the piston and the housing.

[0018] Furthermore, an exhaust channel connected to the through hole is provided on the shell, and an exhaust valve is provided at the opening of the exhaust channel.

[0019] Furthermore, a sealing ring is provided between the piston and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of this application;

[0021] Figure 2 This is an enlarged view of the clamping teeth.

[0022] In the figure, 1, housing; 2, piston; 3, tightening belt; 4, arc-shaped slide groove; 5, exhaust valve; 6, clamping teeth; 7, elastic reset member; 8, pull rod; 9, latch; 10, piston sleeve; 11, exhaust channel; 12, spring cover; 21, limit groove; 31, limit retaining edge; 61, tooth portion; 62, slider; 63, fitting surface. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0024] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0025] like Figure 1-2 As shown, the hydraulic tensioner includes:

[0026] The housing 1 is provided with a through hole for installing the piston 2, and a tightening belt 3 and an arc-shaped slide groove 4 are provided at the top opening of the through hole;

[0027] In this embodiment, the housing 1 is provided with an exhaust channel 11 connected to the through hole, and an exhaust valve 5 is provided at the opening of the exhaust channel 11. The tightening belt 3 is used to limit and support the opening angle of the clamping teeth 6, and the tightening belt 3 is provided with an inclined limiting rib 31. The limiting rib 31 of the tightening belt 3 is a circle, so it can limit and support the clamping teeth 6 while ensuring sufficient strength, and the inclined structural setting can prevent interference with the sharp parts of the clamping teeth 6 during the sliding process, reducing the occurrence of jamming.

[0028] The piston 2 has a pull rod 8 at the top, and a plurality of movably connected clamping teeth 6 are provided on the side of the pull rod 8; when the pull rod 8 moves down with the piston 2, the bottom of the clamping teeth 6 on the pull rod 8 can slide on the arc-shaped slide groove portion 4 so that the top of the clamping teeth 6 is opened; when the pull rod 8 moves up with the piston 2, the clamping teeth 6 on the pull rod 8 can slide on the arc-shaped slide groove portion 4 so that the top of the clamping teeth 6 is closed; wherein, the pull rod 8 is connected with the limit groove 21 between the latch 9 and the inner wall of the piston 2, so that the pull rod 8 and the piston 2 can move relative to each other for a distance, which can also be used for the elastic reset member 7 to drive the pull rod 8 to reset, and when the piston 2 is pulled down, the latch 9 moves to the limit position of the limit groove 21 and can still drive the pull rod 8 to descend, and when released, the elastic reset member 7 is reset, and the pull rod 8 will automatically rise, which is one of the reasons why a gap is provided between the arc-shaped slide groove portion 4 and the spring cover 12 and the side of the pull rod 8.

[0029] In this embodiment, the piston 2 can be the piston rod part of the existing hydraulic cylinder. A piston sleeve 10 is provided between the piston 2 and the housing 1. A sealing ring is provided between the piston 2 and the housing 1. A sealing ring is also provided between the piston sleeve 10 and the housing 1.

[0030] Preferably, each clamping tooth 6 includes a tooth portion 61, a slider 62 disposed below the tooth portion 61, a fitting surface 63 disposed on the side of the slider 62 facing the arc-shaped slide groove portion 4, and the number of clamping teeth 6 is at least two, and they are evenly spaced along the circumferential direction of the pull rod 8. The pull rod 8 is provided with an inclined surface that matches the tooth portion 61, and the back of the tooth shape of the tooth portion 61 is provided with a slope that matches the inclined surface. The arc-shaped slide groove portion 4 and the spring cover 12 are both provided with gaps with the side of the pull rod 8. In this way, the pull rod 8 can slide smoothly, thereby providing a movable space for the bottom of the clamping tooth 6.

[0031] An elastic return member 7 is provided between the piston 2 and the housing 1;

[0032] In this embodiment, the elastic reset member 7 is a common spring, and the pull rod 8 cooperates with the elastic reset member 7 through a spring cover 12, the top of the spring cover 12 abuts against the bottom of the arc-shaped slide groove portion 4, and the bottom abuts against the top of the elastic reset member 7. The spring cover 12 can be used to conveniently install the elastic reset member 7.

[0033] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0034] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0035] Although the present invention uses more terms such as housing 1, piston 2, tightening belt 3, arc-shaped slide groove 4, exhaust valve 5, clamping teeth 6, elastic reset member 7, pull rod 8, latch 9, piston sleeve 10, exhaust channel 11, spring cover 12, limit groove 21, limit rib 31, tooth portion 61, slider 62, and fitting surface 63, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present application; interpreting them as any additional restrictions is contrary to the spirit of the present application.

[0036] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the protection scope of the present application.

Claims

1. Hydraulic tensioner, characterized in that: include: The housing is provided with a through hole for installing the piston, and a tightening belt and an arc-shaped slide groove are provided at the top opening of the through hole; The piston has a pull rod on the top, and a plurality of movably connected clamping teeth on the side of the pull rod; when the pull rod moves downward with the piston, the bottom of the clamping teeth on the pull rod can slide on the arc-shaped slide groove portion so that the top of the clamping teeth is opened; when the pull rod moves upward with the piston, the clamping teeth on the pull rod can slide on the arc-shaped slide groove portion so that the top of the clamping teeth is closed; An elastic return member, disposed between the piston and the housing; Wherein, the tightening belt is used to limit and support the opening angle of the clamping teeth.

2. The hydraulic tensioner according to claim 1, characterized in that: The number of the clamping teeth is at least two, and they are evenly spaced along the circumferential direction of the pull rod.

3. The hydraulic tensioner according to claim 1, characterized in that: Each of the clamping teeth comprises a tooth portion and a sliding block arranged below the tooth portion, and a fitting surface is arranged on a side of the sliding block facing the arc-shaped sliding groove portion.

4. The hydraulic tensioner according to claim 3, characterized in that: The pull rod is provided with an inclined surface matched with the tooth portion, and the back side of the tooth shape of the tooth portion is provided with a slope matched with the inclined surface.

5. The hydraulic tensioner according to claim 4, characterized in that: The tightening belt is provided with an inclined limiting rib.

6. The hydraulic tensioner according to any one of claims 3 to 5, characterized in that: The pull rod cooperates with the elastic return member through a spring cover, the top of the spring cover abuts against the bottom of the arc-shaped sliding groove portion, and the bottom abuts against the top of the elastic return member.

7. The hydraulic tensioner according to claim 6, characterized in that: A gap is provided between the arc-shaped slide groove portion, the spring cover and the side surface of the pull rod.

8. The hydraulic tensioner according to any one of claims 1 to 7, characterized in that: A piston sleeve is also provided between the piston and the housing.

9. The hydraulic tensioner according to any one of claims 1 to 7, characterized in that: The shell is provided with an exhaust channel connected with the through hole, and an exhaust valve is provided at the opening of the exhaust channel.

10. The oil pressure tensioner according to any one of claims 1 to 7, characterized in that: A sealing ring is arranged between the piston and the housing.

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