Self-pressure-relief type tensioner capable of preventing bolt from flying out

Abstract

The utility model discloses a self-pressure-relief type tensioner capable of preventing a bolt from flying out. The self-pressure-relief type tensioner comprises a supporting seat, a cylinder body installed on the supporting seat, an end cover installed on the cylinder body, a piston installed in the cylinder body in a sliding mode and a stretching nut which is movably installed in the end cover and located above the piston. The protective structure is arranged on the end cover and the stretching nut and is used for preventing the stretching nut from flying out, and the protective structure comprises a protective table arranged on the end cover and a boss which is arranged on the stretching nut and corresponds to the protective table. Through the arrangement of the protection structure, the stretching nut is protected in the using process, the stretching nut is prevented from flying out in the using process, the using safety is improved, and potential safety hazards are reduced; and through the arrangement of the pressure release valve, when the movement of the piston in the use process of the tensioner is over-travel, the pressure release valve is automatically opened to release pressure, and the situation that the tensioner is damaged due to the fact that the piston is continuously jacked over-travel is avoided.

Description

Technical Field

[0001] This utility model relates to hydraulic tensioners, specifically a self-releasing tensioner that prevents bolts from flying out. Background Technology

[0002] Existing hydraulic tensioners pose certain safety hazards during use. The tension nut and bolt in a hydraulic tensioner are connected by threads. During operation, a piston compresses the tension nut. However, if excessive pressure or other reasons cause the tension nut and bolt to slip off, detach, or the bolt to come off the installation equipment, the tension nut and bolt may fly out, posing a safety hazard. If they land on the operator, they could cause injury. Therefore, a self-relieving pressure tensioner to prevent bolt flying out is proposed. Utility Model Content

[0003] The purpose of this invention is to solve the above problems by proposing a self-releasing tensioner that prevents bolts from flying out.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a self-relieving tensioner for preventing bolts from flying out, comprising a support base, a cylinder mounted on the support base, an end cap mounted on the cylinder, a piston slidably mounted in the cylinder, and a tension nut movably mounted in the end cap and above the piston; characterized in that it further includes a protective structure on the end cap and the tension nut to prevent the tension nut from flying out, the protective structure comprising a protective platform on the end cap and a boss on the tension nut corresponding to the protective platform.

[0005] A further preferred embodiment includes several springs installed between the piston and the end cap.

[0006] In a further preferred embodiment, a piston chamber is formed between the piston and the cylinder, and the cylinder is provided with a channel communicating with the piston chamber, and a connector is installed on the channel.

[0007] A further preferred embodiment includes a pressure relief valve mounted on the cylinder block, the pressure relief valve comprising a plug, a second spring, a steel ball seat, a steel ball, and a push rod mounted on the cylinder block, with one end of the push rod protruding from the piston end face.

[0008] A further preferred embodiment includes several levers mounted on the tension nut to facilitate rotation of the tension nut.

[0009] A further preferred embodiment includes a ratchet mechanism mounted on a support.

[0010] More preferably, the ratchet mechanism includes a ratchet seat mounted on a support, a ratchet movably mounted on the ratchet seat, and a compression spring mounted on the ratchet seat for pressing the ratchet.

[0011] In a further preferred embodiment, the ratchet is also provided with a measuring disc.

[0012] The beneficial effects of this utility model are: by setting up a protective structure, the tension nut is protected during use, preventing it from flying out, improving safety and reducing safety hazards;

[0013] By using a pressure relief valve, the valve automatically opens to release pressure when the piston moves beyond its travel limit during use, thus preventing the continuous overtravel of the piston from damaging the tensioner. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0015] Figure 2 This is a partial structural diagram of the protective structure of this utility model;

[0016] Figure 3 This is a partial structural diagram of the joint in this utility model;

[0017] Figure 4 This is a partial structural diagram of the pressure relief valve in this utility model;

[0018] Figure 5 This is a top view of the structure of this utility model;

[0019] Figure 6 This is a partial structural schematic diagram from another perspective of this utility model.

[0020] Legend: 1. Support seat; 2. Cylinder body; 21. Piston chamber; 22. Channel; 23. Connector; 3. End cap; 31. Protective platform; 4. Piston; 5. Tension nut; 51. Boss; 6. Spring; 7. Pressure relief valve; 71. Plug; 72. Spring II; 73. Steel ball seat; 74. Steel ball; 75. Push rod; 8. Lever; 9. Ratchet mechanism; 91. Ratchet seat; 92. Ratchet; 93. Compression spring; 94. Scale plate. Detailed Implementation

[0021] The following description, in conjunction with the accompanying drawings, further illustrates the self-releasing tensioner for preventing bolts from flying out according to this utility model.

[0022] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly; for example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can also mean a mechanical connection, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] See Figures 1-6 As shown, a self-releasing tensioner for preventing bolts from flying out includes a support base 1, a cylinder 2 mounted on the support base 1, an end cap 3 mounted on the cylinder 2, a piston 4 slidably mounted in the cylinder 2, and a tension nut 5 movably mounted in the end cap 3 and above the piston 4; characterized in that it also includes a protective structure provided on the end cap 3 and the tension nut 5 to prevent the tension nut 5 from flying out, the protective structure including a protective platform 31 provided on the end cap 3 and a boss 51 provided on the tension nut 5 corresponding to the protective platform 31;

[0025] The protective structure protects the tension nut 5 during use, preventing it from flying out, thus improving safety and reducing potential hazards.

[0026] In one embodiment, a plurality of springs 6 are also installed between the piston 4 and the end cap 3, and the restoring force of the springs 6 is used to push the piston 4 to reset.

[0027] In one embodiment, a piston chamber 21 is formed between the piston 4 and the cylinder 2. The cylinder 2 is provided with a channel 22 communicating with the piston chamber 21. A connector 23 is installed on the channel 22. The connector 23 is used to connect to an oil supply device. The oil supply device pumps hydraulic oil into the piston chamber 21 through the connector 23 and the channel 22 to push the piston 4 to move. The piston 4 then pushes the tension nut 5 to move.

[0028] In one embodiment, a pressure relief valve 7 is also included, which is installed on the cylinder 2. The pressure relief valve 7 includes a plug 71, a spring 72, a steel ball seat 73, a steel ball 74, and a push rod 75 installed in the cylinder 2. One end of the push rod 75 protrudes from the end face of the piston 4. By setting the pressure relief valve 7, when the piston 4 moves overtravel during the use of the tensioner, the pressure relief valve 7 is automatically opened to relieve pressure, so as to avoid continuous overtravel of the piston 4 and damage to the tensioner. The plug 71 is provided with a through hole through which hydraulic oil can pass.

[0029] In one embodiment, a plurality of levers 8 are also installed on the tension nut 5 to facilitate rotation of the tension nut 5. The levers 8 facilitate rotation of the tension nut 5.

[0030] In one embodiment, it further includes a ratchet mechanism 9 mounted on the support base 1; the ratchet mechanism 9 includes a ratchet seat 91 mounted on the support base 1, a ratchet 92 movably mounted on the ratchet seat 91, and a compression spring 93 mounted on the ratchet seat 91 for pressing the ratchet 92.

[0031] With the ratchet 92, after the bolt is stretched, the ratchet 92 can be rotated, and the nut can be tightened by the ratchet 92 engaging with the nut with gears; with the compression spring 93, the ratchet 92 is elastically pressed and installed on the ratchet seat 91.

[0032] In one embodiment, the ratchet 92 is further provided with a measuring disc 94.

[0033] In use, the following steps are taken: First, the support base 1 is installed on the equipment where the bolt needs to be tightened. Then, by rotating the lever 8, the lever 8 drives the tension nut 5 to rotate, thus connecting the tension nut 5 to the bolt thread. The ratchet 92 is then engaged with the nut on the bolt. Next, the tensioner is supplied with oil through the oil supply device. The hydraulic oil enters the piston chamber 21 through the connector 23 and the channel 22. After entering the piston chamber 21, the hydraulic oil pushes the piston 4 upward, which in turn pushes the tension nut 5 upward. The tension nut 5 then pulls the bolt and applies pressure to the equipment where the bolt is installed. Finally, by rotating the ratchet 92, the nut can be rotated until it is tightened.

[0034] During use, if the piston 4 causes the push rod 75 to contact the end cover 3 during its movement, the end cover 3 applies downward pressure to the push rod 75 during the continuous upward movement of the piston 4. The push rod 75 pushes the steel ball 74 downward to open the pressure relief valve 7. At this time, the hydraulic oil in the piston chamber 21 flows out through the pressure relief valve 7 to relieve pressure, preventing the piston 4 from being pushed up and overtravel, thus playing a safety protection role.

[0035] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. A self-releasing tensioner for preventing bolt ejection, comprising a support base (1), a cylinder (2) mounted on the support base (1), an end cap (3) mounted on the cylinder (2), a piston (4) slidably mounted within the cylinder (2), and a tension nut (5) movably mounted within the end cap (3) and above the piston (4); characterized in that... It also includes a protective structure provided on the end cap (3) and the tension nut (5) to prevent the tension nut (5) from flying out. The protective structure includes a protective platform (31) provided on the end cap (3) and a boss (51) provided on the tension nut (5) corresponding to the protective platform (31).

2. The self-relieving tensioner for preventing bolts from flying out according to claim 1, characterized in that: It also includes several springs (6) installed between the piston (4) and the end cap (3).

3. The self-relieving tensioner for preventing bolts from flying out according to claim 2, characterized in that: A piston chamber (21) is formed between the piston (4) and the cylinder (2). The cylinder (2) is provided with a channel (22) that communicates with the piston chamber (21). A connector (23) is installed on the channel (22).

4. The self-relieving tensioner for preventing bolts from flying out according to claim 3, characterized in that: It also includes a pressure relief valve (7) installed on the cylinder (2), the pressure relief valve (7) comprising a plug (71), a second spring (72), a steel ball seat (73), a steel ball (74) and a push rod (75) installed in the cylinder (2), one end of the push rod (75) protruding from the end face of the piston (4).

5. The self-relieving tensioner for preventing bolts from flying out according to claim 1, characterized in that: It also includes several levers (8) mounted on the tension nut (5) to facilitate rotation of the tension nut (5).

6. The self-relieving tensioner for preventing bolts from flying out according to claim 1, characterized in that: It also includes a ratchet mechanism (9) mounted on the support (1).

7. A self-relieving tensioner for preventing bolts from flying out according to claim 6, characterized in that: The ratchet mechanism (9) includes a ratchet seat (91) mounted on a support (1), a ratchet (92) movably mounted on the ratchet seat (91), and a compression spring (93) mounted on the ratchet seat (91) for pressing the ratchet (92).

8. A self-relieving tensioner for preventing bolts from flying out according to claim 7, characterized in that: The ratchet (92) is also provided with a ruler plate (94).

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