Hydraulic wrench based on angle sensor principle

Abstract

The hydraulic wrench based on the angle sensor principle comprises a shell and a driving shaft, the driving shaft is arranged in the shell in a rotating mode, the two ends of the driving shaft extend to the outside of the shell, a power device and a sensing device are arranged in the shell, a detachable counter-force arm is arranged on the shell, the power device comprises an oil cylinder assembly and a ratchet wheel assembly, and the sensing device is arranged on the counter-force arm. The oil cylinder assembly is connected with the ratchet wheel assembly and drives the ratchet wheel assembly to rotate, and the ratchet wheel assembly is connected with the driving shaft and drives the driving shaft to rotate. According to the hydraulic wrench based on the angle sensor principle, through the gear fixedly connected with the driving shaft and the grating reading head, when a bolt just reaches a preset screwing angle, the hydraulic wrench stops working, the working precision of screwing the bolt is effectively improved, the sensing device is detachably arranged, and the working efficiency is improved. The application range of the hydraulic wrench is wide, one-way rotation of the ratchet wheel is achieved through the pawl and the limiting claw, and errors are prevented from occurring in the bolt twisting process.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic wrenches, in particular to a hydraulic wrench based on the principle of an angle sensor. Background Art

[0002] Hydraulic wrench is a hydraulic tool for bolting, which can output and set torque and is a high-pressure hydraulic tool. It is widely used in equipment maintenance and installation in many heavy chemical industrial fields such as petrochemical, wind power, hydropower, thermal power, mining, machinery, steel mills, rubber, pipelines, etc.

[0003] Usually, the output torque of the hydraulic wrench is set by the torque method for the bolt to be tightened, and the torque method converts the required pre-tightening force (F0) into the corresponding torque value through the formula T=K*F0*d (where K is the empirical estimate of the tightening torque coefficient), and finds the corresponding pressure value based on the torque value through the corresponding pressure-torque comparison table, and then adjusts the pressure gauge to the corresponding value through the pump station pressure regulating valve and locks it, and then connects the hydraulic wrench to operate.

[0004] However, due to factors such as the friction coefficient and geometric parameter deviation between bolts and nuts (the processing accuracy error between thread pairs, surface treatment error and the presence or absence of lubricating oil, the tightening torque coefficient value K ranges from 0.1 to 0.3) and the accuracy of the wrench itself (pressure gauge accuracy error and manufacturing error), the conversion of preload and torque values ​​can only be used as a theoretical reference. Therefore, the method of controlling the bolt preload by tightening torque is not accurate and the data deviation is large.

[0005] If the bolt is overtightened, that is, the pre-tightening force is too large, the bolt may be broken, the connected parts may be crushed or bitten, or the threads may be sheared off and disengaged; if the pre-tightening force is insufficient, the connected parts will slip and dislocate, resulting in failures such as joint surface seal leakage and fastener shearing.

[0006] In order to improve the working accuracy of tightening bolts, it is necessary to design a hydraulic wrench that can intuitively reflect the output torque of the hydraulic wrench. Summary of the invention

[0007] The purpose of the utility model is to construct a hydraulic wrench based on the principle of an angle sensor, which can reflect the output torque value of the hydraulic wrench according to the screwing angle of the bolt, based on the existing hydraulic wrench and based on the demand for intuitively reflecting the output torque size of the hydraulic wrench.

[0008] A hydraulic wrench based on the angle sensor principle, comprising a housing and a drive shaft, wherein the drive shaft is rotatably arranged in the housing, and both ends of the drive shaft extend to the outside of the housing, characterized in that a power device capable of driving the drive shaft to rotate and a sensor device capable of monitoring the rotation angle of the drive shaft are arranged in the housing, and a detachable reaction arm is arranged on the housing;

[0009] One end of the drive shaft is connected to the bolt to be screwed, and the other end of the drive shaft is connected to the sensor device;

[0010] The power device comprises a cylinder assembly and a ratchet assembly, wherein the cylinder assembly is connected to the ratchet assembly and the cylinder assembly drives the ratchet assembly to rotate, and the ratchet assembly is connected to the drive shaft and the ratchet assembly drives the drive shaft to rotate;

[0011] The oil cylinder assembly is connected to the hydraulic pump.

[0012] Furthermore, the sensor device is installed on the outer side of the shell.

[0013] The sensor device includes an irregular installation shell, in which a partition part capable of isolating the exposed circuit is provided. The sensor device also includes a power module capable of controlling the start and stop of the sensor device, a gear capable of rotating at the same frequency as the driving shaft, a grating reader capable of detecting the rotation angle of the gear, and a data processing module capable of receiving and transmitting the rotation angle of the gear.

[0014] Specifically, the irregular installation shell is provided with a penetrating sensing hole.

[0015] The power module is fixedly installed in the irregular installation shell, the data processing module is fixedly installed in the irregular installation shell, the gear is fixedly connected to one end of the drive shaft, and the gear is located in the sensing hole. A sensing opening is provided at the partition portion surrounding the sensing hole in the irregular installation shell, and the grating reader is fixedly installed in the irregular installation shell corresponding to the sensing opening position. The grating reader can monitor the rotation angle of the gear in real time through the reserved sensing opening, and can effectively monitor the bolt tightening angle while protecting the internal structure of the sensor device.

[0016] Furthermore, the sensor device is detachably mounted on the housing, and the sensor device is fixed to the outer surface of the housing by a fixing bolt with an adjustable fixed position. This can effectively match the use conditions of the hydraulic wrench. When the bolt tightening accuracy requirement is not high, the conventional method is used to use the hydraulic wrench to improve the working efficiency of tightening the bolt. When the bolt tightening accuracy requirement is high, the angle setting method is used to use the hydraulic wrench, which effectively improves the processing accuracy of the hydraulic wrench.

[0017] Furthermore, the cylinder assembly includes an oil port, a piston, an oil chamber and a limit piece. The oil chamber is arranged in the shell, one end of the piston is slidably connected to the inner wall of the oil chamber, and the other end of the piston passes through the oil chamber. The limit piece is arranged at one end of the oil chamber, the oil port is fixedly mounted on the shell, and the oil port is connected to the oil chamber through an oil pipe.

[0018] Furthermore, the ratchet assembly includes a connecting rod, a ratchet, a pawl and a limiting pawl. A linkage cavity is provided in the piston and passes through the other end face thereof. One end of the connecting rod is rotatably connected to the bottom of the linkage cavity, and the other end of the connecting rod extends to the outside of the piston. The pawl is rotatably connected to the other end of the connecting rod. The ratchet is mounted on the housing through a rotating bearing and is fixedly connected to the drive shaft. The end of the pawl is meshed with the outer peripheral surface of the ratchet. The limiting pawl is rotatably connected to the housing, and the end of the limiting pawl is meshed with the outer peripheral surface of the ratchet and limits the ratchet to rotate in one direction.

[0019] Furthermore, a first return spring is provided between the pawl and the housing to ensure that the pawl can mesh with the ratchet wheel and push the ratchet wheel to rotate every time the cylinder assembly moves the piston;

[0020] A second reset spring is arranged between the limiting claw and the housing to ensure that the limiting claw can clamp the ratchet wheel each time the ratchet wheel is reset, so that the ratchet wheel can only rotate in one direction.

[0021] Furthermore, a handle capable of releasing the restriction of the limiting claw on the ratchet is provided on the shell, the limiting claw is rotatably connected to the shell via a rotating shaft, one end of the rotating shaft is connected to the limiting claw, and the other end of the rotating shaft is connected to the handle.

[0022] The beneficial effects of the utility model are as follows: the hydraulic wrench based on the angle sensor principle disclosed in the present application can obtain the rotation angle of the drive shaft from the rotation angle of the gear monitored by the grating reader through the gear fixedly connected to the drive shaft and the grating reader, and set the screwing angle of the bolt to be screwed according to the need to rotate the drive shaft to a corresponding angle when the bolt reaches the preset pre-tightening force. When the bolt just reaches the preset screwing angle, the hydraulic wrench stops working, effectively improving the working accuracy of screwing the bolt. The detachable setting of the sensor device enables the hydraulic wrench to adapt to high-precision processing and low-precision processing, and the hydraulic wrench has a wide range of applications. The unidirectional rotation of the ratchet is also achieved through the pawl and the limit pawl, so that the bolt keeps rotating in one direction during the screwing process, reducing the difficulty of the grating reader to monitor the gear rotation angle, preventing errors in the bolt during the screwing process, and further ensuring the working accuracy of the bolt.

[0023] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of a specific example of the hydraulic wrench of the utility model;

[0026] Figure 2 yes Figure 1 A top view of

[0027] Figure 3 yes Figure 1 A schematic cross-sectional structure diagram of ;

[0028] Figure 4 yes Figure 3 Schematic diagram of some structures;

[0029] Figure 5 It is a structural schematic diagram of a sensor device in a specific example of the hydraulic wrench of the utility model;

[0030] Figure 6 yes Figure 5 The main view of

[0031] Figure 7 It is a structural schematic diagram of an irregular installation shell in a specific example of the hydraulic wrench of the utility model;

[0032] Figure 8 yes Figure 7 The main view of

[0033] Fig. 9 yes Figure 3 A magnified view of the local structure;

[0034] In the figure: 101, housing; 102, oil port; 103, reaction arm; 104, sensor device; 105, connecting rod; 106, piston; 107, limit piece; 108, ratchet; 109, driving shaft; 110, pawl; 111, first return spring; 112, oil chamber; 113, limit pawl; 114, second return spring; 115, irregular installation shell; 116, arc partition; 117, data processing module; 119, gear; 120, second fastening bolt; 121, grating reader; 123, first fastening bolt; 124, power module; 125, locking piece; 126, limit bolt; 127, locking spring; 128, handle; 129, strip partition; 130, groove. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] The hydraulic wrench of the utility model is further described in conjunction with the accompanying drawings.

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the hydraulic wrench described in this embodiment includes a housing 101, a drive shaft 109 is rotatably arranged in the housing 101, an oil port 102 is fixedly installed on the top of the housing 101, the oil port 102 is connected to the hydraulic pump, an oil chamber 112 is arranged in the housing 101, an oil pipe connecting the oil chamber 112 and the oil port 102 is arranged in the housing 101, and a limit member 107 (with a fixed position) is fixedly installed at the front end of the oil chamber 112 Figure 2 The middle limit member 107 is located in front of the oil chamber 112). The front end of the limit member 107 is provided with a locking portion with a diameter larger than the diameter of the front end port of the shell 101. The piston 106 is slidably connected in the oil chamber 112. The piston 106 includes front and rear ends. The front end of the piston 106 is slidably connected to the oil chamber 112, and the rear end of the piston 106 passes through the oil chamber 112 and is slidably connected to the shell 101.

[0038] A linkage chamber with an opening facing backward is provided in the piston 106, and the linkage chamber includes a connecting part and a movable part. The connecting part is located at the front end of the linkage chamber, and a connecting rod 105 is slidably connected in the linkage chamber. The front end of the connecting rod 105 is rotatably connected to the connecting part of the linkage chamber, and the rear end of the connecting rod 105 extends to the outside of the piston 106. A pawl 110 is rotatably connected to the rear end of the connecting rod 105. A first return spring 111 is provided between the pawl 110 and the housing 101, so that the pawl 110 can return to the initial position when the power device makes a piston movement.

[0039] The ratchet 108 is installed on the housing 101 through a rotating bearing. The ratchet 108 is fixedly connected to the drive shaft 109. The left and right ends of the drive shaft 109 extend to the outside of the housing 101. The end of the pawl 110 is meshed with the outer peripheral surface of the ratchet 108. A limiting pawl 113 is also rotatably installed on the housing 101. The end of the limiting pawl 113 is meshed with the outer peripheral surface of the ratchet 108 and limits the ratchet 108 to make it rotate in one direction. A second reset spring 114 is provided between the limiting pawl 113 and the housing 101, which can limit the rotation direction of the ratchet 108 when the pawl 110 is reset, so that it can only rotate in one direction.

[0040] The housing 101 is also provided with a handle 128 that can release the limit claw 113 from limiting the ratchet 108 . The limit claw 113 is rotatably connected to the housing 101 via a shaft, one end of the shaft is connected to the limit claw 113 , and the other end of the shaft is connected to the handle 128 .

[0041] A detachable reaction arm 103 is fixedly mounted on the front end of the housing 101 .

[0042] A sensor device 104 fixedly connected to the housing 101 is provided on the left side of the driving shaft 109 .

[0043] like Fig. 9 As shown, an annular connecting port is provided on the reaction arm 103, and a locking structure is provided at the annular connecting port. The locking structure includes a locking member 125, a limiting bolt 126 and a locking spring 127. The limiting bolt 126 is fixedly mounted on the reaction arm 103, the locking member 125 is slidably connected to the limiting bolt 126 and is limited by the limiting bolt 126, and the locking spring 127 is arranged between the locking member 125 and the reaction arm 103.

[0044] A locking step is provided at the lower edge of the stopper 107, and a locking portion connected to the locking step is provided on the upper end surface of the locking member 125. When the locking member 125 is pressed down, the locking portion of the locking member 125 is separated and unlocked from the locking step of the stopper 107, so that the reaction arm 103 can be disassembled from the housing 101. When the locking member 125 is lifted and slid upward by the locking spring 127, the locking portion of the locking member 125 is locked with the locking step of the stopper 107, so that the reaction arm 103 is matched and installed with the housing 101 and the connection is stable.

[0045] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the sensing device 104 includes an irregular installation shell 115, and the irregular installation shell 115 is provided with a strip-shaped fixing groove running through the left and right sides and a sensing hole running through the left and right sides. The irregular installation shell 115 is provided with a partition part capable of isolating the exposed circuit, and the partition part includes a strip-shaped partition 129 and an arc-shaped partition 116. The strip-shaped partition 129 is located at the strip-shaped fixing groove, and the arc-shaped partition 116 is located at the sensing hole. A sensing opening is provided on the arc-shaped partition 116, and a groove 130 for installing the receiving end of the grating reader is provided on the inner wall of the irregular installation shell 115 corresponding to the position of the sensing opening.

[0046] The sensing device 104 includes a power module 124 capable of controlling the start and stop of the sensing device 104 , a gear 119 capable of rotating at the same frequency as the driving shaft 109 , a grating reader 121 capable of detecting the rotation angle of the gear 119 , and a data processing module 117 capable of receiving and transmitting the rotation angle of the gear 119 .

[0047] The power module 124 is fixedly installed at the upper front of the irregular installation shell 115, and the data processing module 117 is fixedly installed at the lower rear of the irregular installation shell 115. The data processing module 117 is arranged as an arc structure and is arranged along the arc partition 116. The compact arrangement of the structure can effectively reduce the volume of the sensor device 104.

[0048] The grating reader 121 is arranged inside the irregular installation shell 115 fixedly mounted corresponding to the sensing opening position on the arc partition 116. The grating reader 121 can monitor the rotation angle of the gear 119 in real time through the reserved sensing opening, and can effectively monitor the bolt rotation angle while protecting the internal circuit of the sensor device 104.

[0049] The gear 119 is fixedly connected to the left end of the driving shaft 109 , and the gear 119 is located in the sensing hole on the irregular installation shell 115 .

[0050] The sensor device 104 is detachably mounted on the housing 101 , and the sensor device 104 is fixed to the outer surface of the housing 101 by a fixing structure capable of adjusting the installation position of the sensor device 104 .

[0051] The fixing structure includes a first fastening bolt 123 disposed in a strip partition 129 and a second fastening bolt 120 provided with a connecting handle. The sensor device 104 is convenient for disassembly and assembly, and can effectively match the use conditions of the hydraulic wrench. When the bolt tightening accuracy requirement is not high, the conventional method is used to use the hydraulic wrench to improve the working efficiency of tightening the bolt. When the bolt tightening accuracy requirement is high, the angle setting method is used to use the hydraulic wrench, which effectively improves the processing accuracy of the hydraulic wrench.

[0052] When you start working,

[0053] (1) According to the pre-tightening force required when tightening the bolt to be tightened, set the angle at which the bolt needs to be rotated;

[0054] (2) The hydraulic pump pressurizes the oil chamber 112 through the oil port 102, injects hydraulic oil, and the piston 106 slides backward. The sliding of the piston 106 drives the connecting rod 105 to move backward. The ratchet 110 arranged at the rear end of the connecting rod 105 moves backward and downward accordingly, and pushes the ratchet 108 to rotate clockwise. The rotation of the ratchet 108 drives the drive shaft 109 to rotate and tighten the bolt.

[0055] (3) The drive shaft 109 rotates to drive the gear 119 fixedly connected thereto to rotate, and the grating reader 121 monitors the rotation angle of the gear 119 and feeds back the angle to the control end of the hydraulic pump through the data processing module 117;

[0056] (4) The hydraulic pump releases the pressure in the oil chamber 112 through the oil port 102, and the piston 106 slides forward. The piston 106 slides forward, driving the connecting rod 105 to move forward. The pawl 110 arranged at the rear end of the connecting rod 105 moves forward and upward accordingly. The pawl 110 returns to its original position, and the limit pawl 113 clamps the ratchet 108 to prevent the ratchet 108 from rotating counterclockwise.

[0057] (5) Repeat the above (2)-(4), accumulate the rotation angle values ​​collected by the control end of the hydraulic pump, and stop the operation when the total rotation angle reaches the preset rotation angle.

[0058] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic wrench based on the angle sensor principle, comprising a housing and a drive shaft, wherein the drive shaft is rotatably disposed in the housing, and both ends of the drive shaft extend to the outside of the housing, characterized in that: The housing is provided with a power device capable of driving the drive shaft to rotate and a sensor device capable of monitoring the rotation angle of the drive shaft, and the housing is provided with a detachable reaction arm; One end of the drive shaft is connected to the bolt to be screwed, and the other end of the drive shaft is connected to the sensor device; The power device comprises a cylinder assembly and a ratchet assembly, wherein the cylinder assembly is connected to the ratchet assembly and the cylinder assembly drives the ratchet assembly to rotate, and the ratchet assembly is connected to the drive shaft and the ratchet assembly drives the drive shaft to rotate.

2. A hydraulic wrench based on the angle sensor principle according to claim 1, characterized in that: The sensor device is mounted on the outer side of the housing.

3. A hydraulic wrench based on the angle sensor principle according to claim 1, characterized in that: The sensor device includes an irregular installation shell, in which a partition part capable of isolating the exposed circuit is provided. The sensor device also includes a power module capable of controlling the start and stop of the sensor device, a gear capable of rotating at the same frequency as the driving shaft, a grating reader capable of detecting the rotation angle of the gear, and a data processing module capable of receiving and transmitting the rotation angle of the gear.

4. A hydraulic wrench based on the angle sensor principle according to claim 3, characterized in that: The irregular installation shell is provided with a penetrating sensing hole. The power module is fixedly installed in the irregular installation shell, the data processing module is fixedly installed in the irregular installation shell, the gear is fixedly connected to one end of the driving shaft, and the gear is located in the sensing hole, a sensing opening is provided in the partition portion surrounding the sensing hole in the irregular installation shell, and the grating reader is fixedly installed in the irregular installation shell corresponding to the position of the sensing opening.

5. The hydraulic wrench based on the angle sensor principle according to claim 1, characterized in that: The sensor device is detachably mounted on the housing, and the sensor device is fixed to the outer side of the housing by fixing bolts with adjustable fixed positions.

6. The hydraulic wrench based on the angle sensor principle according to claim 1, characterized in that: The cylinder assembly includes an oil port, a piston, an oil chamber and a limiter. The oil chamber is arranged in the shell, one end of the piston is slidably connected to the inner wall of the oil chamber, and the other end of the piston passes through the oil chamber. The limiter is arranged at one end of the oil chamber, the oil port is fixedly mounted on the shell, and the oil port is connected to the oil chamber through an oil pipe.

7. A hydraulic wrench based on the angle sensor principle according to claim 6, characterized in that: The ratchet assembly includes a connecting rod, a ratchet, a pawl and a limiting pawl. A linkage cavity is provided in the piston and passes through the other end surface thereof. One end of the connecting rod is rotatably connected to the bottom of the linkage cavity, and the other end of the connecting rod extends to the outside of the piston. The pawl is rotatably connected to the other end of the connecting rod. The ratchet is mounted on the housing through a rotating bearing and is fixedly connected to the driving shaft. The end of the pawl is meshed with the outer peripheral surface of the ratchet. The limiting pawl is rotatably connected to the housing, and the end of the limiting pawl is meshed with the outer peripheral surface of the ratchet and limits the ratchet to rotate in one direction.

8. A hydraulic wrench based on the angle sensor principle according to claim 7, characterized in that: A first return spring is provided between the pawl and the housing; A second return spring is provided between the limiting claw and the housing.

9. A hydraulic wrench based on the angle sensor principle according to claim 7, characterized in that: The housing is provided with a handle capable of releasing the limit of the limit claw on the ratchet; the limit claw is rotatably connected to the housing via a rotating shaft, one end of the rotating shaft is connected to the limit claw, and the other end of the rotating shaft is connected to the handle.

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