Hydraulic cylinder with displacement monitoring function

Abstract

The utility model relates to the technical field of hydraulic cylinders, and discloses a hydraulic cylinder with a displacement monitoring function, which comprises a cylinder body, a fastening component is arranged at the top of the cylinder body, a cylinder cover is mounted at the top of the cylinder body through the fastening component, and the fastening component comprises a bolt, an opening, a tensioning strip, a nut, a first screw rod, an adjusting hole, a tensioning block and a top cover. The bolts are circumferentially distributed on the surface of the cylinder cover, and openings are evenly formed in the outer circumferential faces of the bolts in the circumferential direction. According to the hydraulic cylinder with the displacement monitoring function, through the arrangement of the fastening assembly, a nut can be tensioned on a screw rod, the nut is not prone to loosening, and therefore the cylinder cover and the cylinder body are fixed more firmly, a top cover is rotated to drive a tensioning block to move upwards, a tensioning strip is opened in the moving process of the tensioning block, and therefore the tensioning effect is improved. The tensioning strip is in contact with the inner wall of the nut all the time, the nut is tensioned on the bolt, the nut is not prone to loosening and does not fall off, and the nut and the bolt are fixed more firmly.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with displacement monitoring. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, producing linear reciprocating (or oscillating) motion. It features a simple structure and reliable operation. Using it to achieve reciprocating motion eliminates the need for a reduction gear, eliminates transmission backlash, and provides smooth motion. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] According to the application number 202322608986.8, a hydraulic cylinder with displacement monitoring is disclosed, including a cylinder body, a cylinder bottom, a cylinder head and a plunger. The plunger and the cylinder bottom are both provided with a cavity. The cylinder bottom is provided with a guide tube. The guide tube is fixedly connected to the cylinder bottom. The guide tube is embedded in the cavity of the cylinder bottom and the plunger. The cylinder bottom is fixedly connected to a displacement sensor. The guide tube is slidably connected to a connecting tube. The connecting tube is fixedly connected to a connecting plate. One end of the connecting plate is fixedly connected to the displacement sensor, and the other end is connected to the plunger through a connecting strip. During operation, when the plunger rises, it drives the connecting strip and the connecting plate fixed to the connecting strip to rise. The connecting plate drives the probe of the displacement sensor to rise, thereby realizing displacement monitoring of the plunger. At the same time, the guide tube cooperates with the connecting tube, the connecting plate and the cylinder bottom to realize sealing of the displacement sensor, solving the sealing problem of the displacement sensor in the hydraulic cylinder.

[0004] The following problems still exist in actual use:

[0005] In the prior art, the cylinder body and cylinder head of the hydraulic cylinder are connected and fixed by multiple sets of bolts. However, the traditional bolt rods only have ordinary threads, which have insufficient friction. The fastening nuts are easily loosened and fall off due to the vibration or inertia of the hydraulic cylinder, which brings great safety hazards to work. In addition, the piston is sealed with a single sealing structure, which has the problem of poor wear resistance after long-term use. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the utility model provides a hydraulic cylinder with displacement monitoring, which can tighten the nut on the screw rod, the nut is not easy to loosen, and will not fall off. The nut and the bolt are firmly fixed, making the fixation between the cylinder body and the cylinder head more secure, solving the problems raised in the background technology.

[0007] The utility model provides the following technical solution: a hydraulic cylinder with displacement monitoring, comprising a cylinder body, a fastening assembly is provided on the top of the cylinder body, and a cylinder cover is installed on the top of the cylinder body through the fastening assembly;

[0008] The fastening assembly includes a bolt, an opening, a tensioning strip, a nut, a first screw, an adjustment hole, a tensioning block and a top cover. The bolts are circumferentially distributed on the surface of the cylinder head. Openings are evenly distributed on the outer circumference of the bolt. The openings divide the bolt into several circumferentially evenly distributed tensioning strips. A nut is provided on the surface threaded portion of the bolt. A first screw is provided inside the bolt. An adjustment hole is provided at the inner bottom of the bolt. The bottom end of the first screw is fixedly connected to the tensioning block, and the top end of the first screw is fixedly connected to the top cover.

[0009] Preferably, the cylinder body is slidably connected to a piston rod, and a piston assembly is provided at the bottom end of the piston rod. The piston assembly includes a piston head, a mounting groove, a guide ring, a sealing groove, a sealing ring, and a limit angle. The bottom end of the piston rod is fixedly connected to the piston head, and the outer surface of the piston head is provided with a mounting groove, and a guide ring is installed inside the mounting groove. The outer surface of the piston head is provided with a sealing groove, and a sealing ring is installed inside the sealing groove. The surface of the sealing ring is provided with a limited angle.

[0010] Preferably, the bolt is threadedly connected to the cylinder head and the cylinder body, the nut is threadedly connected to the surface of the bolt, the first screw is threadedly connected to the internal thread of the bolt, the tightening block is fixedly connected to the bottom end of the first screw, and the top cover is fixedly connected to the top end of the first screw and is arranged on the top of the bolt.

[0011] Preferably, the adjustment hole is in the shape of a frustum that is narrow at the top and wide at the bottom, and the tensioning block is also in the shape of a frustum that is narrow at the top and wide at the bottom, and the inclined portion of the tensioning block fits with the inclined portion of the adjustment hole.

[0012] Preferably, one side of the cylinder body is fixedly connected with an oil inlet and outlet pipe.

[0013] Preferably, a displacement sensor is fixedly mounted on the inner bottom of the cylinder body, and a detection rod of the displacement sensor is fixedly connected to the inside of the piston rod.

[0014] Preferably, the number of the mounting grooves is two, and a rectangular groove corresponding to a limited angle is provided in the sealing groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The hydraulic cylinder with displacement monitoring is equipped with a fastening assembly to tighten the nut on the screw rod, making the nut not easy to loosen, thereby making the fixation between the cylinder cover and the cylinder body more secure. The top cover is rotated to drive the tightening block to move upward. During the movement of the tightening block, the tightening bar is stretched so that the tightening bar is always in contact with the inner wall of the nut. The nut is tightened on the bolt, making the nut not easy to loosen or fall off, and the fixation between the nut and the bolt is more secure.

[0017] 2. The hydraulic cylinder with displacement monitoring uses a displacement sensor to monitor displacement. When the piston rod moves, it can guide through the guide ring and seal through the sealing ring. The sealing ring is positioned by the limit angle to ensure that the sealing ring fits tightly with the piston head, preventing the sealing ring from moving during use and ensuring sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a hydraulic cylinder with displacement monitoring provided by the utility model;

[0019] Figure 2 A schematic diagram of the internal structure of a hydraulic cylinder with displacement detection provided by the utility model;

[0020] Figure 3 A schematic structural diagram of a fastening assembly of a hydraulic cylinder with displacement monitoring provided by the utility model;

[0021] Figure 4 A schematic cross-sectional view of a fastening assembly of a hydraulic cylinder with displacement monitoring provided by the present invention;

[0022] Figure 5 This is a schematic structural diagram of a piston assembly of a hydraulic cylinder with displacement monitoring provided by the utility model.

[0023] In the figure: 1. Cylinder body; 2. Oil inlet and outlet pipes; 3. Cylinder head; 4. Fastening assembly; 41. Bolt; 42. Opening; 43. Tensioning strip; 44. Nut; 45. First screw; 46. Adjustment hole; 47. Tensioning block; 48. Top cover; 5. Displacement sensor; 6. Piston rod; 7. Piston assembly; 71. Piston head; 72. Mounting groove; 73. Guide ring; 74. Sealing groove; 75. Sealing ring; 76. Limit angle. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figures 1 to 4A hydraulic cylinder with displacement monitoring includes a cylinder body 1, a fastening assembly 4 is provided on the top of the cylinder body 1, a cylinder head 3 is installed on the top of the cylinder body 1 through the fastening assembly 4, the fastening assembly 4 includes a bolt 41, an opening 42, a tensioning strip 43, a nut 44, a first screw 45, an adjustment hole 46, a tensioning block 47 and a top cover 48, the bolts 41 are circumferentially distributed on the surface of the cylinder head 3, the outer circumferential surface of the bolt 41 is uniformly opened with openings 42, the openings 42 divide the bolt 41 into a plurality of tensioning strips 43 uniformly distributed around the circumference, a nut 44 is provided on the surface threaded portion of the bolt 41, a first screw 45 is provided inside the bolt 41, an adjustment hole 46 is opened at the bottom of the inner bottom of the bolt 41, the bottom end of the first screw 45 is fixedly connected to the tensioning block 47, and the top end of the first screw 45 is fixedly connected to the top cover 48;

[0026] By providing the fastening assembly 4, the nut 44 can be tightened on the bolt 41, making the nut 44 not easy to loosen, thereby making the fixation between the cylinder head 3 and the cylinder body 1 more secure, and the fixation between the nut 44 and the bolt 41 more secure, preventing the nut 44 from falling off due to vibration or inertia.

[0027] See also Figures 1 to 4 The bolt 41 is threadedly connected to the cylinder head 3 and the cylinder body 1, the nut 44 is threadedly connected to the surface of the bolt 41, the first screw 45 is threadedly connected to the inner thread of the bolt 41, the tensioning block 47 is fixedly connected to the bottom end of the first screw 45, the top cover 48 is fixedly connected to the top end of the first screw 45, and is arranged on the top of the bolt 41. The adjustment hole 46 is shaped like a frustum that is narrow at the top and wide at the bottom. The tensioning block 47 is also shaped like a frustum that is narrow at the top and wide at the bottom, and the inclined portion of the tensioning block 47 fits the inclined portion of the adjustment hole 46.

[0028] By rotating the top cover 48, the tensioning block 47 moves upward, and the tensioning bar 43 is stretched during the movement of the tensioning block 47, so that the tensioning bar 43 is always in contact with the inner wall of the nut 44. The nut 44 is tightened on the bolt 41, making it difficult for the nut 44 to loosen or fall off.

[0029] See also Figure 2 and Figure 5 , the interior of the cylinder body 1 is slidably connected to the piston rod 6, and the bottom end of the piston rod 6 is provided with a piston assembly 7, which includes a piston head 71, a mounting groove 72, a guide ring 73, a sealing groove 74, a sealing ring 75, and a limit angle 76. The bottom end of the piston rod 6 is fixedly connected to the piston head 71, and the outer surface of the piston head 71 is provided with a mounting groove 72. A guide ring 73 is installed inside the mounting groove 72. A sealing groove 74 is provided on the outer surface of the piston head 71, and a sealing ring 75 is installed inside the sealing groove 74. The surface of the sealing ring 75 is provided with a limited angle 76. There are two mounting grooves 72, and a rectangular groove corresponding to the limited angle 76 is provided in the sealing groove 74.

[0030] When the piston rod 6 moves, it can play a guiding role through the guide ring 73 and a sealing role through the sealing ring 75. The sealing ring 75 is positioned by the limit angle 76 to ensure that the sealing ring 75 fits tightly with the piston head 71, preventing the sealing ring 75 from moving during use and ensuring sealing.

[0031] See also Figures 1 to 2 One side of the cylinder body 1 is fixedly connected with the inlet and outlet oil pipes 2, and the inner bottom of the cylinder body 1 is fixedly installed with a displacement sensor 5. The detection rod of the displacement sensor 5 is fixedly connected to the inside of the piston rod 6. When the piston rod 6 reciprocates up and down, it can drive the detection rod of the displacement sensor 5 to move, and then the displacement distance of the piston rod 6 is monitored by the displacement sensor 5.

[0032] In the present invention, the working principle of the device is as follows:

[0033] When in use, the cylinder cover 3 is placed on the top of the cylinder body 1, and then the cylinder cover 3 and the cylinder body 1 are initially fixed by screwing in multiple sets of bolts 41, and then the nut 44 is threadedly installed on the threaded section of the bolt 41, and then the top cover 48 is rotated upward to drive the first screw rod 45 to rotate and move upward. A tensioning block 47 is fixed to the bottom end of the first screw rod 45. The tensioning block 47 is in the shape of a round cone with a narrow top and a wide bottom. When the first screw rod 45 rotates upward, it drives the tensioning block 47 to move upward. During the movement of the tensioning block 47, the tensioning bar 43 is stretched open, so that the tensioning bar 43 is always in contact with the inner wall of the nut 44. The nut 44 is tightened on the bolt 41, so that the nut 44 is not easy to loosen, let alone fall off. The fixation of the nut 44 to the bolt 41 is more firm, and the nut 44 is prevented from loosening and falling off due to vibration or inertia, making the fixation between the cylinder cover 3 and the cylinder body 1 more firm.

[0034] When the piston rod 6 reciprocates up and down, it can drive the detection rod of the displacement sensor 5 to move, and then the displacement distance of the piston rod 6 is monitored by the displacement sensor 5. While the piston rod 6 moves, it can play a guiding role through the guide ring 73 and play a sealing role through the sealing ring 75. The sealing ring 75 is positioned by the limit angle 76 to ensure that the sealing ring 75 is tightly fitted with the piston head 71, preventing the sealing ring 75 from moving during use and ensuring sealing.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder with displacement monitoring, comprising a cylinder body (1), characterized in that: A fastening assembly (4) is provided on the top of the cylinder body (1), and a cylinder cover (3) is mounted on the top of the cylinder body (1) via the fastening assembly (4); The fastening assembly (4) includes a bolt (41), an opening (42), a tensioning strip (43), a nut (44), a first screw rod (45), an adjustment hole (46), a tensioning block (47) and a top cover (48). The bolt (41) is circumferentially distributed on the surface of the cylinder head (3). Openings (42) are evenly distributed circumferentially on the outer circumferential surface of the bolt (41). The openings (42) divide the bolt (41) into a plurality of tensioning strips (43) evenly distributed circumferentially. A nut (44) is provided on the surface threaded portion of the bolt (41). A first screw rod (45) is provided inside the bolt (41). An adjustment hole (46) is provided at the bottom of the inner portion of the bolt (41). The bottom end of the first screw rod (45) is fixedly connected to the tensioning block (47), and the top end of the first screw rod (45) is fixedly connected to the top cover (48).

2. The hydraulic cylinder with displacement monitoring according to claim 1, characterized in that: The cylinder body (1) is slidably connected to a piston rod (6), and a piston assembly (7) is provided at the bottom end of the piston rod (6). The piston assembly (7) includes a piston head (71), a mounting groove (72), a guide ring (73), a sealing groove (74), a sealing ring (75), and a limiting angle (76). The bottom end of the piston rod (6) is fixedly connected to the piston head (71), and the outer surface of the piston head (71) is provided with a mounting groove (72). A guide ring (73) is installed inside the mounting groove (72). The outer surface of the piston head (71) is provided with a sealing groove (74), and a sealing ring (75) is installed inside the sealing groove (74). The surface of the sealing ring (75) is provided with a limiting angle (76).

3. The hydraulic cylinder with displacement monitoring according to claim 1, characterized in that: The bolt (41) is threadedly connected to the cylinder cover (3) and the cylinder body (1), the nut (44) is threadedly connected to the surface of the bolt (41), the first screw rod (45) is threadedly connected to the inner thread of the bolt (41), the tensioning block (47) is fixedly connected to the bottom end of the first screw rod (45), and the top cover (48) is fixedly connected to the top end of the first screw rod (45) and is arranged on the top of the bolt (41).

4. The hydraulic cylinder with displacement monitoring according to claim 1, characterized in that: The adjusting hole (46) is in the shape of a truncated cone with a narrow top and a wide bottom. The tightening block (47) is also in the shape of a truncated cone with a narrow top and a wide bottom. The inclined surface of the tightening block (47) fits with the inclined surface of the adjusting hole (46).

5. The hydraulic cylinder with displacement monitoring according to claim 1, characterized in that: One side of the cylinder body (1) is fixedly connected with an oil inlet and outlet pipe (2).

6. The hydraulic cylinder with displacement monitoring according to claim 1, characterized in that: A displacement sensor (5) is fixedly mounted on the inner bottom of the cylinder body (1), and a detection rod of the displacement sensor (5) is fixedly connected to the inside of the piston rod (6).

7. The hydraulic cylinder with displacement monitoring according to claim 2, characterized in that: The number of the mounting grooves (72) is two, and a rectangular groove corresponding to the limited angle (76) is provided in the sealing groove (74).

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