An automatic reset integral hydraulic stretching device

Abstract

The utility model discloses an automatic reset integral type hydraulic stretching device, including a plurality of hydraulic stretchers, the below of every hydraulic stretcher all are connected with fixed sleeve, the hydraulic stretcher is the self-resetting type hydraulic stretcher of automatic reset, a plurality of hydraulic stretchers are fixedly installed on same connecting plate, the fixed sleeve is equipped with the stretching bolt of upper end through the hydraulic stretcher, the upper end of stretching bolt is equipped with the stretching nut, the lower end of stretching bolt is connected with the bolt of being pulled, and the bolt of being pulled is equipped with the nut of being pulled, the connecting plate is equipped with the distribution body for every hydraulic stretcher synchronous distribution hydraulic oil, and every hydraulic stretcher can promote the stretching nut to drive stretching bolt to move upward under the action of hydraulic oil, and the bolt of being pulled that is connected with itself is lengthened in its elastic deformation range. The utility model not only can complete the stretching work of multiple bolts once, but also can reset automatically after stretching work is completed.

Description

Technical Field

[0001] This utility model relates to the technical field of tensioners, and in particular to a hydraulic tensioner device, specifically an automatic reset integral hydraulic tensioning device. Background Technology

[0002] Hydraulic tensioners are used to apply force to bolts, causing them to elongate within their elastic deformation range, resulting in slight deformation and achieving the required stretch. During operation, the moving part of the hydraulic tensioner rises with the bolt. However, traditional hydraulic tensioners often fail to return to their original position smoothly after stretching operations due to the presence of internal oil. This necessitates using a heavy object like a copper rod to forcefully push the tensioner back into place before each use, reducing efficiency and shortening its lifespan. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an automatic reset integral hydraulic tensioning device that is simple in structure, easy to operate, can not only complete the tensioning of multiple bolts at one time, but also can automatically reset after the tensioning is completed, in view of the current situation of the prior art.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: An automatic reset integral hydraulic tensioning device includes multiple hydraulic tensioners, each with a coaxially connected fixing sleeve for support. The hydraulic tensioners are self-resetting type, automatically resetting under spring force after operation. Multiple hydraulic tensioners are arranged in a ring and fixedly mounted on the same connecting plate. The fixing sleeve contains a tension bolt with its upper end axially passing through the hydraulic tensioner. A tension nut is helically installed at the upper end of the tension bolt, and a tension bolt is helically connected to the lower end of the tension bolt, with a tension nut helically fitted onto the tension bolt. The connecting plate has a distribution body for synchronously supplying hydraulic oil to each hydraulic tensioner. Each hydraulic tensioner, under the action of hydraulic oil, pushes the tension nut, causing the tension bolt to move upward, elongating the tension bolt connected to it within its elastic deformation range.

[0005] To optimize the above technical solution, the specific measures also include: The aforementioned connecting plate consists of an annular plate and a cross-shaped plate connected within the annular plate; hydraulic tensioners are fixedly installed on the annular plate of the connecting plate at intervals, and the distribution body is fixedly installed at the center of the cross-shaped plate.

[0006] The top center of the aforementioned distribution body is formed with a hydraulic oil inlet extending downwards. Multiple hydraulic oil distribution ports connected to the hydraulic oil inlet are spaced apart on the periphery of the distribution body. Each hydraulic oil distribution port is connected to a corresponding hydraulic tensioner via an oil supply pipe.

[0007] The aforementioned hydraulic tensioner is assembled from a main body shell, an annular cover plate, a movable body, and a disc spring. The annular cover plate is positioned and installed on the upper port of the main body shell. The movable body is disposed in the main body shell, and the disc spring is press-fitted between the movable body and the annular cover plate to provide spring force for the reset of the movable body. A hydraulic chamber for pushing the movable body upward is provided between the movable body and the main body shell.

[0008] The outer casing of the main body is provided with an oil inlet and an exhaust port circumferentially spaced 180 degrees apart. Both the oil inlet and the exhaust port are connected to the hydraulic chamber. The exhaust port is equipped with an oil plug. One end of the oil supply pipe is connected to the hydraulic oil distribution port of the distribution body via a connector, and the other end of the oil supply pipe is connected to the oil inlet of the main body casing via a connector.

[0009] The upper end of the aforementioned tension bolt passes through the outer shell, the movable body, the disc spring, and the annular cover plate in sequence; the lower end of the tension nut passes through the annular cover plate and the disc spring in sequence and engages with the upper end face of the movable body.

[0010] A sealing ring is provided between the outer shell and the moving body to prevent oil leakage from the hydraulic chamber.

[0011] The lower end of the aforementioned fixing sleeve has a 180-degree arc cut on its circumference at the position of the pulled nut. The cut is equipped with a handle for turning the pulled nut to tighten it again after the pulled bolt is stretched.

[0012] The aforementioned connecting plate is equipped with a total of nine hydraulic tensioners.

[0013] Compared with existing technologies, the hydraulic tensioner in this utility model is a self-resetting hydraulic tensioner capable of automatic reset. The hydraulic tensioner is equipped with a disc spring for reset; the spring force ensures that the hydraulic tensioner automatically resets after each operation, eliminating the need for additional reset operations and facilitating subsequent stretching. This utility model can also supply oil to multiple hydraulic tensioners simultaneously, stretching multiple bolts at once, improving efficiency; it also ensures that the hydraulic pressure on bolts stretched in the same operation is the same, improving the consistency of force on each bolt. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view schematic diagram of this utility model; Figure 3 This is a schematic diagram of the structure of the hydraulic tensioner of this utility model; Figure 4 This is a cross-sectional view of the distribution body of this utility model; In the figure, the following are the reference numerals: sealing ring M, hydraulic chamber Q1, handle S, connecting plate 1, annular plate 11, cross plate 12, hydraulic tensioner 2, body shell 21, oil inlet 21a, exhaust port 21b, annular cover plate 22, moving body 23, disc spring 24, oil plug 25, fixing sleeve 3, notch 3a, tension bolt 4, tension nut 5, tensioned bolt 6, tensioned nut 7, distribution body 8, hydraulic oil inlet 8a, hydraulic oil distribution port 8b, oil supply pipe 9, connector 91. Detailed Implementation

[0015] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0016] Figures 1 to 4 This is a schematic diagram of the structure of this utility model. As shown in the figure, this utility model discloses an automatic reset integral hydraulic tensioning device. This hydraulic tensioning device can complete the tensioning work of multiple bolts at one time, and the hydraulic tensioner can automatically reset after working, avoiding the problem of needing to use heavy objects such as copper rods to strike and vibrate the hydraulic tensioner to reset in the traditional technology.

[0017] The automatic reset integral hydraulic tensioning device of this utility model includes multiple hydraulic tensioners 2, and each hydraulic tensioner 2 is coaxially connected to a fixing sleeve 3 at its lower part. The fixing sleeve 3 serves to provide a fixed support for the connected hydraulic tensioners 2. Figure 1 As can be seen, a tension bolt 4 is provided in the fixed sleeve 3. The upper end of the tension bolt 4 passes through the hydraulic tensioner 2 and a tension nut 5 is screwed onto its upper end. The lower end of the tension bolt 4 is connected to the tensioned bolt 6 by a threaded connection, and a tension nut 7 is screwed onto the tensioned bolt 6.

[0018] The hydraulic tensioner 2 of this invention is a self-resetting hydraulic tensioner that automatically resets under the action of spring force after operation. Multiple hydraulic tensioners 2 are fixedly installed on the same connecting plate 1, and these hydraulic tensioners 2 are distributed in a ring on the connecting plate 1. A distribution body 8 is provided on the connecting plate 1, which can synchronously supply high-pressure hydraulic oil supplied from the outside to each hydraulic tensioner 2. Each hydraulic tensioner 2 can push the tension nut 5 under the action of hydraulic oil, causing the tension bolt 4 to move upward. The tension bolt 4 then pulls the tensioned bolt 6 connected below it, causing the tensioned bolt 6 to be stretched within its elastic deformation range due to the tension force. When the tensioned bolt 6 has completed its stretching operation, the hydraulic oil supply stops, so that the hydraulic tensioner 2 of this invention can reset itself using its internal spring force after the hydraulic oil pressure disappears.

[0019] In the embodiments, as shown Figure 2As shown, the connecting plate 1 of this utility model consists of an annular plate 11 and a cross-shaped plate 12 connected within the annular plate 11. Hydraulic tensioners 2 are fixedly installed on the annular plate 11 of the connecting plate 1 at intervals. The distribution body 8 of this utility model is fixedly installed at the center of the cross-shaped plate 12.

[0020] In the embodiments, as shown Figure 4 As shown, a hydraulic oil inlet 8a is formed extending downward from the center of the top surface of the distribution body 8 of this utility model. The hydraulic oil inlet 8a is used to connect to a hydraulic oil pipe that supplies hydraulic oil from the outside. Multiple hydraulic oil distribution ports 8b are spaced apart on the circumferential surface of the distribution body 8, and each hydraulic oil distribution port 8b is connected to the hydraulic oil inlet 8a. Each hydraulic oil distribution port 8b is connected to a corresponding hydraulic tensioner 2 via an oil supply pipe 9.

[0021] In the embodiments, as shown Figure 3 As shown, the hydraulic tensioner 2 of this utility model is assembled from a tensioner body shell 21, an annular cover plate 22, a movable body 23, and a disc spring 24. The body shell 21 has a piston cavity with a relatively large diameter and a guide hole with a relatively small diameter, the guide hole and the piston cavity axially penetrating the body shell 21 sequentially. The annular cover plate 22 has a circular structure and is bolted to the upper port of the body shell 21, i.e., the opening of the piston cavity. The movable body 23 is movably disposed within the body shell 21. The movable body 23 includes a piston part with a relatively large diameter and a rod part with a relatively small diameter. The piston part of the movable body 23 is sealed and slidably engaged with the piston cavity, and the rod part of the movable body 23 is slidably guided and engaged with the guide hole of the body shell 21. The guide hole provides guidance for the up-and-down movement of the movable body 23 to ensure the stability of its movement. A through hole for the tension bolt 4 to pass through is axially formed at the center of the movable body 23. Disc spring 24 is press-fitted into the piston cavity between the movable body 23 and the annular cover plate 22. The upper end of disc spring 24 abuts against the annular cover plate 22, and the lower end of disc spring 24 abuts against the top surface of the piston portion of the movable body 23. When the movable body 23 moves upward, the disc spring 24 can be compressed and store force, and when the hydraulic pressure disappears, the stored spring force can push the movable body 23 downward to reset. Figure 3 As can be seen, an annular groove is machined on the bottom surface of the piston chamber of the outer shell 21. This groove forms a hydraulic chamber Q1 between the movable body 23 and the outer shell 21. When the hydraulic chamber Q1 is filled with high-pressure hydraulic oil, the hydraulic oil will push the movable body 23 upward. The hydraulic oil used in this invention is engine oil.

[0022] like Figure 3As shown, this utility model has an oil inlet 21a and an exhaust port 21b formed on the circumferential surface of the outer shell 21. The oil inlet 21a and the exhaust port 21b are circumferentially 180 degrees apart. Both the oil inlet 21a and the exhaust port 21b are connected to the hydraulic chamber Q1, and the exhaust port 21b is equipped with an oil plug 25. The exhaust port 21b is used to purge the air from the hydraulic chamber Q1 when oil is first introduced. After the air is purged, the exhaust port 21b is sealed with the oil plug 25. Figure 1 and Figure 2 As shown, one end of the oil supply pipe 9 of this utility model is connected to the hydraulic oil distribution port 8b of the distribution body 8 via a connector 91, and the other end of the oil supply pipe 9 is connected to the oil inlet 21a of the outer shell 21 via a connector 91.

[0023] In the embodiments, as shown Figure 1 As shown, the upper end of the tension bolt 4 extends out of the hydraulic tensioner 2 through the lower port of the main body shell 21, the central through hole of the movable body 23, the inner hole of the disc spring 24, and the inner hole of the annular cover plate 22. The tension nut 5 is relatively longer than a regular nut. The lower middle part of the tension nut 5 extends into the hydraulic tensioner 2, and its lower end passes through the annular cover plate 22 and the disc spring 24 to engage with the upper end face of the movable body 23.

[0024] To prevent oil leakage from hydraulic chamber Q1, from Figure 3 It can be seen that the piston part and the rod part of the movable body 23 are both fitted with sealing rings M, which can enhance the sealing performance between the outer shell 21 and the movable body 23.

[0025] In the embodiments, as shown Figure 1 As shown, this utility model also has a notch 3a formed on the circumferential surface of the lower end of the fixing sleeve 3. The notch 3a is formed at a position corresponding to the pulled nut 7. The arc angle of the notch 3a is 180 degrees, and a handle S is provided with the notch 3a. The notch 3a with a large arc angle can increase the space for the handle S to move the pulled nut 7, so as to facilitate the tightening of the pulled nut 7 again after the pulled bolt 6 is stretched.

[0026] from Figure 2 As can be seen, the connecting plate 1 of this utility model is provided with a total of nine hydraulic tensioners 2. Therefore, this utility model can simultaneously stretch all nine bolts 6 in each operation, and the hydraulic pressure for stretching the nine bolts 6 is the same, so the tensile force borne by each bolt 6 is consistent.

[0027] The stretching method of this utility model is as follows: When the device is working, high-pressure hydraulic oil enters the hydraulic chamber Q1 of each hydraulic tensioner 2 through the distributor 8 and the oil supply pipe 9. When the pressure of the hydraulic oil is greater than the spring force of the disc spring 24, the hydraulic oil pushes the stretching nut 5 through the movable body 23, causing the stretching bolt 4 to compress the disc spring 24 and move upward. The stretching bolt 4 then transmits the tension received to the stretched bolt 6, causing the stretched bolt 6 to be stretched within the elastic range. After the stretched bolt 6 is stretched, the stretched nut 7 is retightened through the handle S. After the stretched nut 7 is retightened and the stretching is completed, the hydraulic oil supply stops. At this time, the hydraulic pressure acting on the movable body 23 disappears, the compression of the disc spring 24 is converted into elastic force and released, pushing the movable body 23 downward to its original position, completing the automatic reset.

[0028] The above embodiments provide a systematic and detailed description of the present utility model. These are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic reset integral hydraulic tensioning device, comprising a plurality of hydraulic tensioners (2), wherein each of the hydraulic tensioners (2) is coaxially connected to a fixing sleeve (3) for supporting the hydraulic tensioner (2); characterized in that: The hydraulic tensioner (2) is a self-resetting hydraulic tensioner that can automatically reset under the action of spring force after operation. Multiple hydraulic tensioners (2) are arranged in a ring and fixedly installed on the same connecting plate (1). The fixing sleeve (3) is provided with a tension bolt (4) that passes through the hydraulic tensioner (2) axially at the upper end. The upper end of the tension bolt (4) is screwed with a tension nut (5). The lower end of the tension bolt (4) is screwed with a tensioned bolt (6). The tensioned bolt (6) is screwed with a tensioned nut (7). The connecting plate (1) is provided with a distribution body (8) for synchronously supplying hydraulic oil to each hydraulic tensioner (2). Each hydraulic tensioner (2) can push the tension nut (5) under the action of hydraulic oil to drive the tension bolt (4) to move upward, and stretch the tensioned bolt (6) connected to it within its elastic deformation range.

2. An automatic reset integrated hydraulic stretching device according to claim 1, characterized in that: The connecting plate (1) consists of an annular plate (11) and a cross-shaped plate (12) connected within the annular plate (11); the hydraulic tensioner (2) is fixedly installed on the annular plate (11) of the connecting plate (1) at intervals, and the distributor (8) is fixedly installed at the center of the cross-shaped plate (12).

3. An automatic reset integrated hydraulic stretching device according to claim 2, characterized in that: The top center of the distribution body (8) is formed with a hydraulic oil inlet (8a) extending downward. The peripheral surface of the distribution body (8) is provided with a plurality of hydraulic oil distribution ports (8b) that are connected to the hydraulic oil inlet (8a) at intervals. Each of the hydraulic oil distribution ports (8b) is connected to the corresponding hydraulic tensioner (2) via an oil supply pipe (9).

4. An automatic reset integrated hydraulic stretching device according to claim 3, characterized in that: The hydraulic tensioner (2) is assembled from a main body shell (21), an annular cover plate (22), a movable body (23), and a disc spring (24). The annular cover plate (22) is positioned and installed on the upper port of the main body shell (21). The movable body (23) is disposed in the main body shell (21). The disc spring (24) is press-fitted between the movable body (23) and the annular cover plate (22) to provide spring force for the reset of the movable body (23). A hydraulic chamber (Q1) is provided between the movable body (23) and the main body shell (21) for pushing the movable body (23) to move upward.

5. The automatic reset integral hydraulic tensioning device according to claim 4, characterized in that: The outer casing (21) of the main body is provided with an oil inlet (21a) and an exhaust port (21b) circumferentially spaced 180 degrees apart; the oil inlet (21a) and the exhaust port (21b) are both connected to the hydraulic chamber (Q1); the exhaust port (21b) is equipped with an oil plug (25); one end of the oil supply pipe (9) is connected to the hydraulic oil distribution port (8b) of the distribution body (8) via a connector (91), and the other end of the oil supply pipe (9) is connected to the oil inlet (21a) of the outer casing (21) of the main body via a connector (91).

6. An automatic reset integrated hydraulic stretching device according to claim 5, characterized in that: The upper end of the tension bolt (4) passes through the outer shell (21), the movable body (23), the disc spring (24), and the annular cover plate (22) in sequence; the lower end of the tension nut (5) passes through the annular cover plate (22) and the disc spring (24) in sequence and engages with the upper end face of the movable body (23).

7. An automatic reset integrated hydraulic stretching device according to claim 6, characterized in that: A sealing ring (M) is provided between the outer shell (21) and the movable body (23) to prevent oil leakage from the hydraulic chamber (Q1).

8. An automatic reset integrated hydraulic stretching device according to claim 7, characterized in that: The lower end of the fixing sleeve (3) has a 180-degree arc cut (3a) formed on the circumferential surface at the position corresponding to the pulled nut (7). The cut (3a) is equipped with a handle (S) for turning the pulled nut (7) to tighten again after the pulled bolt (6) is stretched.

9. An automatic reset integrated hydraulic stretching device according to claim 8, characterized in that: The connecting plate (1) is equipped with a total of nine hydraulic tensioners (2).

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