Built-in displacement detection device for hydraulic cylinder

Abstract

The utility model discloses a built -in hydraulic pressure oil cylinder displacement detection device belongs to hydraulic pressure oil cylinder technical field, including hydraulic pressure oil cylinder body, base, set up at the bottom of hydraulic pressure oil cylinder body, be equipped with the mounting groove in the base, be equipped with the sensor in the mounting groove, the sensor bottom is provided with the connecting ring, the clamping mechanism, set up in the inside mounting groove, the effect is through setting clamping mechanism, connecting ring etc. component, press two mounting blocks can drive the connecting column to promote the sliding block to move to drive the sliding block to move to drive the movement of the clamping block, after putting in the connecting ring, the clamping block can enter the clamping groove, like this can fix the connecting ring and sensor fast, and when disassembling only need to press two mounting blocks simultaneously again to remove the fixed to facilitate the staff to the disassembly and installation of sensor.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology, and in particular to a built-in hydraulic cylinder displacement detection device. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a buffer device, and an exhaust device.

[0003] As a core actuator, the accurate detection of the piston rod displacement of the hydraulic cylinder is crucial for achieving high-precision position control and automation. In recent years, in order to improve the integration and reliability of the system, hydraulic cylinders with built-in displacement sensing have been widely used. In this type of design, it has become the mainstream technical solution to build and fix the detection rod of the displacement sensor, especially the magnetostrictive displacement sensor, inside the cylinder.

[0004] In existing implementations, to ensure the reliability of the seal and resist the impact of high-pressure hydraulic oil, the detection rod of the displacement sensor is usually directly fixed to the base or rear end cover of the cylinder by welding. This welding method has the following problems: when the built-in displacement sensor fails due to aging of its own components, fatigue fracture of the waveguide wire, or abnormal electrical shock, the sensor cannot be removed from the cylinder by maintenance personnel because it has been welded in place; during maintenance, the original weld seam needs to be broken to remove the failed sensor, which is not only complicated to operate, but may also damage the critical sealing surface of the cylinder base.

[0005] The purpose of this invention is to provide a built-in hydraulic cylinder displacement detection device to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a built-in hydraulic cylinder displacement detection device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a built-in hydraulic cylinder displacement detection device, comprising a hydraulic cylinder body, a base disposed at the bottom of the hydraulic cylinder body, an installation groove provided in the base, a sensor disposed in the installation groove, a connecting ring disposed at the bottom of the sensor, and a locking mechanism disposed inside the installation groove, the locking mechanism comprising sliding rails symmetrically disposed inside the installation groove, and a limiting part for fixing the connecting ring slidably disposed at the top of each sliding rail.

[0008] Furthermore, the limiting part includes a sliding block slidably connected to the top of the sliding track, a baffle is provided at the top of the sliding track, a locking block is provided at the top of the sliding block, and the two sliding blocks are connected by a sliding column.

[0009] Furthermore, the sliding column can enter the interior of the sliding block, and a spring is sleeved on the outside of the sliding column. The two ends of the spring are respectively connected to the two sliding blocks. A connecting column is provided on one side of the sliding block, and an installation block is provided at the end of the connecting column.

[0010] Furthermore, the connecting block has symmetrical slots inside, and the slots are adapted to the shape of the block.

[0011] Furthermore, a piston chamber is provided inside the hydraulic cylinder body, and a piston rod is provided inside the piston chamber.

[0012] Furthermore, a front cover is provided on the outside of the hydraulic cylinder body, and the front cover is connected to the base by a connecting rod. A sealing ring is provided inside the hydraulic cylinder body, and a magnetic ring is provided on the outside of the sealing ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This utility model incorporates a snap-fit ​​mechanism and a connecting ring. Pressing the two mounting blocks moves the connecting column, which in turn moves the sliding block, causing it to move and thus the snap-fit ​​block to move. After the connecting ring is inserted, the snap-fit ​​block enters the slot, quickly securing the connecting ring and the sensor. Disassembly is easy by simply pressing the two mounting blocks again, making it convenient for workers to disassemble and install the sensor. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the sealing ring in this utility model; Figure 3 This is a schematic diagram of the sensor structure in this utility model; Figure 4 This is a schematic diagram of the connecting ring in this utility model; Figure 5 This is a schematic diagram of the sliding column in this utility model.

[0016] Explanation of reference numerals in the attached figures: In the picture: 1. Hydraulic cylinder body; 2. Piston rod; 3. Base; 4. Connecting rod; 5. Front cover; 6. Piston chamber; 7. Magnetic ring; 8. Sealing ring; 9. Sensor; 10. Connecting column; 11. Mounting groove; 12. Mounting block; 13. Connecting ring; 14. Slot; 15. Sliding block; 16. Baffle; 17. Sliding rail; 18. Locking block; 19. Spring; 20. Sliding column. Detailed Implementation

[0017] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0018] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0019] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0020] Please see Figures 1 to 5 As shown, a built-in hydraulic cylinder displacement detection device includes a hydraulic cylinder body 1, a piston chamber 6 inside the hydraulic cylinder body 1, a piston rod 2 inside the piston chamber 6, a front cover 5 outside the hydraulic cylinder body 1, the front cover 5 and the base 3 are connected by a connecting rod 4, and after the connecting rod 4 connects the two, they are tightened by bolts. A sealing ring 8 is provided inside the hydraulic cylinder body 1, and a magnetic ring 7 is provided outside the sealing ring 8. The magnetic ring 7 is pressed into the inner hole at the center of the piston rod 2 by interference fit, and reciprocates with the piston rod 2 inside the hydraulic cylinder body 1. When the hydraulic oil drives the piston rod 2 to move, the magnetic ring 7 moves accordingly. When the waveguide wire inside the detection rod is excited by the current pulse, it will generate a torsional stress wave. When the stress wave propagates to the pickup mechanism at the tail of the detection rod, it is converted into an electrical signal. By calculating the time difference between the current pulse being emitted and the stress wave being picked up, the real-time position of the magnetic ring 7 can be accurately calculated, thereby achieving accurate displacement detection. It should be noted that the detection rod is an existing device, and will not be described in detail here. The base 3 is set at the bottom of the hydraulic cylinder body 1. The base 3 has an installation groove 11. The sensor 9 is set in the installation groove 11. The bottom of the sensor 9 has a connecting ring 13. The connecting ring has symmetrical slots 14. The slots 14 are adapted to the shape of the block 18. After the block 18 enters the slot 14, it limits the connecting ring 13 and fixes the sensor 9. A snap-fit ​​mechanism is provided inside the mounting groove 11. The snap-fit ​​mechanism includes sliding rails 17 symmetrically arranged inside the mounting groove 11. The sliding rails 17 are used to slide the sliding blocks 15 and limit their movement trajectory. A limiting part for fixing the connecting ring 13 is slidably provided on the top of a single sliding rail 17. The limiting part includes a sliding block 15 slidably connected to the top of the sliding rail 17. A baffle 16 is provided on the top of the sliding rail 17. The function of the baffle 16 is to prevent the two sliding blocks 15 from sliding out of the sliding rail 17. A locking block 18 is provided on the top of the sliding block 15. The two sliding blocks 15 are connected by a sliding post 20. The sliding post 20 can enter the interior of the sliding block 15. A spring 19 is sleeved on the outside of the sliding post 20. The function of the spring 19 is to restore the two sliding blocks 15 to their original position after they move. The two ends of the spring 19 are respectively connected to the two sliding blocks 15. A connecting post 10 is provided on one side of the sliding block 15. A mounting block 12 is provided at the end of the connecting post 10.

[0021] Working principle: When in use, press both mounting blocks 12 simultaneously, which will cause the connecting column 10 to move simultaneously. The connecting column 10 will then push the sliding block 15 to slide, so that the sliding block 15 slides on the top of the sliding track 17. The sliding block 15 will then move the locking block 18, and the sliding column 20 will move towards the sliding block 15, thereby compressing the spring 19. At this time, the connecting ring 13 at the bottom of the sensor 9 is placed between the two locking blocks 18. Then, release the mounting blocks 12, and the spring 19 will return to its original shape, thereby pushing the sliding block 15 back to its original position. Thus, the locking block 18 enters the slot 14 to form a limit fixation.

[0022] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in hydraulic cylinder displacement detection device, characterized in that: include Hydraulic cylinder body (1); The base (3) is set at the bottom of the hydraulic cylinder body (1). The base (3) has an installation groove (11) and a sensor (9) is set in the installation groove (11). A connecting ring (13) is set at the bottom of the sensor (9). A snap-fit ​​mechanism is provided inside the mounting groove (11). The snap-fit ​​mechanism includes sliding rails (17) symmetrically arranged inside the mounting groove (11). A limiting part for fixing the connecting ring (13) is slidably provided on the top of each sliding rail (17).

2. The built-in hydraulic cylinder displacement detection device according to claim 1, characterized in that: The limiting part includes a sliding block (15) slidably connected to the top of the sliding track (17), a baffle (16) is provided on the top of the sliding track (17), a locking block (18) is provided on the top of the sliding block (15), and the two sliding blocks (15) are connected by a sliding column (20).

3. The built-in hydraulic cylinder displacement detection device according to claim 2, characterized in that: The sliding column (20) can enter the interior of the sliding block (15). A spring (19) is sleeved on the outside of the sliding column (20). The two ends of the spring (19) are respectively connected to the two sliding blocks (15). A connecting column (10) is provided on one side of the sliding block (15). An installation block (12) is provided at the end of the connecting column (10).

4. The built-in hydraulic cylinder displacement detection device according to claim 1, characterized in that: The connecting ring (13) has symmetrical slots (14) inside, and the slots (14) are adapted to the shape of the block (18).

5. The built-in hydraulic cylinder displacement detection device according to claim 1, characterized in that: The hydraulic cylinder body (1) is provided with a piston chamber (6), and the piston chamber (6) is provided with a piston rod (2).

6. The built-in hydraulic cylinder displacement detection device according to claim 1, characterized in that: The hydraulic cylinder body (1) is provided with a front cover (5) on the outside. The front cover (5) is connected to the base (3) by a connecting rod (4). The hydraulic cylinder body (1) is provided with a sealing ring (8) and a magnetic ring (7) is provided on the outside of the sealing ring (8).

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