Rod falling prevention fastening mechanism for displacement sensor of hydraulic servo-motor

Abstract

The invention relates to the technical field of hydraulic servo-motor fastening structures, and provides an anti-rod-falling fastening mechanism for a hydraulic servo-motor displacement sensor, and the mechanism comprises a nut which is in threaded connection with the free end of a screw rod and abuts against a mounting plate, the side wall of the nut is provided with a knurling groove in the circumferential direction, and a limiting step protruding out of the knurling groove, the knurling groove is positioned between the mounting plate and the limiting step; the hoop comprises an annular body with an opening, the annular body is connected to the nut in a sleeving mode through the opening and abuts against the position between the limiting step and the mounting plate, a clamping groove is formed in the inner wall of the annular body and matched with the knurling groove in a clamped mode, and an anti-rotation blocking piece is further arranged on the annular body and matched with the mounting plate in a clamped mode. According to the fastening structure, the knurling groove in the nut is matched with the clamping groove in the hoop, and the anti-rotation blocking piece on the hoop is matched with the limiting groove in the mounting plate, so that the nut can be prevented from being separated from the screw rod, even if the nut is loosened, the nut cannot fall off from the screw rod, and the displacement sensor is prevented from falling off from the screw rod.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic motor fastening structures, and more specifically, to an anti-drop rod fastening mechanism for a hydraulic motor displacement sensor. Background Art

[0002] The displacement sensor of the hydraulic motor, also known as the Linear Variable Differential Transformer (LVDT), is a widely used displacement sensor used to accurately measure the distance of linear motion. Displacement sensors are also widely used in industrial automation, aerospace, automotive testing and other fields that require high-precision displacement measurement. In addition, displacement sensors can also be used to measure other physical quantities that can be converted into linear displacement changes, such as pressure, strain, etc.

[0003] Among them, displacement sensors are generally used in hydraulic oil motors and play a very important role in practical applications. However, when there is vibration on site or the installation is not in place, the structure used to fasten the displacement sensor is likely to loosen and cause slippage, thus causing accidents of varying degrees, and even safety accidents in some cases.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the invention

[0005] The purpose of the present application is to propose an anti-drop rod fastening mechanism for a hydraulic motor displacement sensor, so as to solve the technical problem in the prior art that the displacement sensor is easy to drop after installation.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide an anti-drop rod fastening mechanism for an oil motor displacement sensor, the oil motor includes a mounting plate with a threaded through hole, the displacement sensor is provided with a screw, the screw is threadedly engaged with the threaded through hole, the free end of the screw passes through from one side of the mounting plate to the other side of the mounting plate, and the fastening mechanism includes:

[0007] A nut, which is threaded on the free end of the screw rod and abuts against the mounting plate, wherein a side wall of the nut is provided with a knurled groove and a limiting step protruding from the knurled groove along the circumferential direction, and the knurled groove is located between the mounting plate and the limiting step;

[0008] The clamp comprises an annular main body with an opening, the annular main body is sleeved on the nut through the opening and stops between the limit step and the mounting plate, the inner wall of the annular main body is provided with a slot, the slot is snap-fitted with the knurled groove, and the annular main body is also provided with an anti-rotation baffle, the anti-rotation baffle is snap-fitted with the mounting plate.

[0009] Furthermore, the annular body is an elastic member with elasticity, the opening is smaller than the outer diameter of the nut, and the inner diameter of the annular body in a free state is not larger than the outer diameter of the nut at the knurled groove.

[0010] Furthermore, the knurled groove includes any one of a straight groove, a cross groove, a triangular groove, and a star groove, or a combination thereof.

[0011] In some embodiments, a limiting groove is provided on the mounting plate, and the anti-rotation baffle extends from the annular body toward the mounting plate and is engaged and snap-fitted into the limiting groove.

[0012] Furthermore, the anti-rotation baffle includes a first extension portion and a second extension portion connected to each other in an L-shape, the first extension portion is connected to the annular body and parallel to the plane where the annular body is located, the second extension portion is perpendicular to the plane where the annular body is located, and the anti-rotation baffle is respectively arranged at both ends of the opening.

[0013] In some embodiments, the side wall of the nut is further provided with a tightening portion along the circumferential direction for cooperating with a wrench, and the tightening portion is located on a side of the limiting step away from the knurled groove.

[0014] Furthermore, it also includes a flat washer, which is sleeved on the screw rod and abuts between the nut and the mounting plate.

[0015] In some embodiments, a spring washer is further included, wherein the spring washer is sleeved on the screw rod and abuts between the flat washer and the nut.

[0016] Furthermore, a support block is provided on one side of the annular body facing the mounting plate, and the support block is abutted between the annular body and the mounting plate along the circumference of the flat washer and the spring washer.

[0017] In some embodiments, the mounting plate includes a first side and a second side, the first side and the second side are both provided with the limiting groove, the free end of the screw rod passes through the first side of the mounting plate to the second side of the mounting plate, and the screw rod is connected to the nut and the clamp on the first side and the second side of the mounting plate.

[0018] The beneficial effect of the anti-drop rod fastening mechanism for the oil motor displacement sensor provided by the present application is at least that: the fastening structure can prevent the nut from falling off the screw rod through the cooperation of the knurled groove on the nut and the clamping groove on the clamping hoop, and the cooperation of the anti-rotation baffle on the clamping hoop and the upper limit groove on the mounting plate, and the nut can position the clamping hoop through the limiting step to keep the clamping hoop and the nut relatively fixed on the mounting plate. Even if the nut becomes loose, the nut will not fall off the screw rod due to the limiting action of the clamping hoop, thereby preventing the displacement sensor from falling off the screw rod after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of the anti-drop rod fastening mechanism for the oil motor displacement sensor provided in an embodiment of the present application after installation;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the fastening mechanism during installation;

[0022] Figure 3 A schematic diagram of the structure of a nut provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of the clamp provided in the embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of the mounting plate provided in the embodiment of the present application;

[0025] Figure 6 A schematic diagram of the structure of a spring washer provided in an embodiment of the present application;

[0026] Figure 7 This is a schematic diagram of the structure of the flat washer provided in an embodiment of the present application.

[0027] Among them, the reference numerals in the figure are:

[0028] 1. Nut; 11. Knurled groove; 12. Limiting step; 13. Tightening part;

[0029] 2. Hoop; 21. Opening; 22. Ring-shaped body; 23. Slot; 24. Anti-rotation baffle; 25. First extension; 26. Second extension; 27. Support block;

[0030] 3. Flat washer;

[0031] 4. Spring washer;

[0032] 5. Mounting plate; 51. Threaded through hole; 52. Limiting groove; 53. First side; 54. Second side;

[0033] 6. Screw. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0036] The following describes the anti-drop rod fastening mechanism for the oil motor displacement sensor in an embodiment of the present application in conjunction with the accompanying drawings.

[0037] See also Figure 1 , Figure 1 The schematic diagram of the structure of the anti-drop rod fastening mechanism for the displacement sensor of the oil motor of the present application after installation is shown. The oil motor includes a mounting plate with a threaded through hole, and the displacement sensor is provided with a screw rod, which is threadedly engaged with the threaded through hole, and the free end of the screw rod passes through from one side of the mounting plate to the other side of the mounting plate.

[0038] It should be noted that in traditional technology, after the screw is connected to the mounting plate, a conventional nut is screwed onto the screw to tighten the connection between the screw and the mounting plate. However, a strong tightening effect cannot be achieved by the nut alone. For example, when the oil motor is in use, a relatively strong relative vibration will be generated between the structures. The relative vibration between the structures can easily cause the nut to rotate relative to the screw, or when the nut is not installed in place, it will cause the nut to loosen, and then cause the displacement sensor to loosen, which can easily cause the displacement sensor to slip, causing accidents of varying degrees, and even safety accidents in some cases.

[0039] In the embodiment of the present application, in order to overcome the problem that the conventional nut 1 is easy to loosen, the screw rod 6 and the mounting plate 5 are fastened by a fastening mechanism to prevent the displacement sensor from falling. Figure 1-Figure 5 The fastening mechanism includes a nut 1 and a hoop 2. The nut 1 is used to be connected to the screw rod 6. The hoop 2 is clamped and limited between the nut 1 and the mounting plate 5 to prevent the nut 1 from falling off due to loosening.

[0040] Continue reading Figure 1-Figure 5 The nut 1 is threaded on the free end of the screw rod 6 and stops at the mounting plate 5. The side wall of the nut 1 is provided with a knurled groove 11 and a limiting step 12 protruding from the knurled groove 11 along the circumferential direction. The knurled groove 11 is located between the mounting plate 5 and the limiting step 12.

[0041] The clamp 2 includes an annular main body 22 with an opening 21. The annular main body 22 is sleeved on the nut 1 through the opening 21 and stops between the limit step 12 and the mounting plate 5. The inner wall of the annular main body 22 is provided with a slot 23, which is snap-fitted with the knurled groove 11. The annular main body 22 is also provided with an anti-rotation baffle 24, which is snap-fitted with the mounting plate 5.

[0042] When installing the displacement sensor on the hydraulic motor, first, screw the screw 6 on the displacement sensor to the threaded through hole 51 of the mounting plate 5, and make the free end of the screw 6 pass from one side of the mounting plate 5 to the other side of the mounting plate 5, that is, make the free end of the screw 6 protrude from the mounting plate 5, so that the nut 1 can be installed on the free end of the screw 6 for tightening.

[0043] Then, the nut 1 is screwed onto the free end of the screw rod 6, and the nut 1 is rotated until the nut 1 is pressed against the mounting plate 5, so that the screw rod 6 is more firmly connected to the mounting plate 5, thereby achieving a tightening effect.

[0044] Finally, the hoop 2 is sleeved on the nut 1 through the opening 21. During the sleeve process, the annular body 22 is stopped between the limiting step 12 and the mounting plate 5, so that the hoop 2 and the nut 1 will not move relative to each other in the radial direction; and the clamping groove 23 on the annular body 22 is also engaged with the knurled groove 11 of the nut 1. After the clamping groove 23 and the knurled groove 11 are engaged, the hoop 2 and the nut 1 will not rotate relative to each other; at the same time, the anti-rotation baffle 24 is also engaged with the mounting plate 5, so that the hoop 2 will not rotate relative to the mounting plate 5.

[0045] After installation, the clamping hoop 2 is limited in rotation relative to the mounting plate 5 by the clamping connection between the anti-rotation baffle 24 and the mounting plate 5, and the clamping hoop 2 is limited in radial direction from disengaging from the nut 1 by stopping between the limit step 12 and the mounting plate 5. When there is no external force interfering with the appearance of the clamping hoop 2, the clamping hoop 2 will not rotate on the plane where the mounting plate 5 is located, nor will it move on the plane where the vertical mounting plate 5 is located to cause the clamping hoop 2 to fall off. In other words, the position of the clamping hoop 2 relative to the mounting plate 5 is relatively fixed.

[0046] Furthermore, since the clamping hoop 2 and the nut 1 are connected by the clamping fit of the clamping groove 23 and the knurled groove 11, if the nut 1 rotates, the clamping hoop 2 also needs to rotate synchronously with the nut 1, but since the clamping hoop 2 is clamped in the limiting groove 52 by the anti-rotation baffle 24, it will not rotate on the plane where the mounting plate 5 is located, and the nut 1 will not rotate on the plane where the mounting plate 5 is located, so that the nut 1 will not rotate and disengage from the screw rod 6. Even if the nut 1 has become somewhat loose when the clamping hoop 2 is installed, due to the mutual limitation of the clamping groove 23 on the clamping hoop 2 and the knurled groove 11 on the nut 1, the loose nut 1 will only remain in the current loose state, will not continue to rotate and disengage from the screw rod 6, and the nut 1 can still be kept connected to the screw rod 6. In this way, the nut 1 can always be connected to the screw rod 6, so the displacement sensor will not fall off, and the problem that the displacement sensor is easy to fall off after installation can be solved.

[0047] It can be found that the fastening structure of the embodiment of the present application can prevent the nut 1 from detaching from the screw rod 6 through the cooperation between the knurled groove 11 on the nut 1 and the slot 23 on the hoop 2, as well as the cooperation between the anti-rotation baffle 24 on the hoop 2 and the upper limit groove 52 on the mounting plate 5, and the nut 1 can position the hoop 2 through the limiting step 12 to keep the hoop 2 and the nut 1 relatively fixed on the mounting plate 5, even if the nut 1 becomes loose, under the limiting action of the hoop 2, the nut 1 will not fall off the screw rod 6, thereby preventing the displacement sensor from falling off the screw rod 6 after installation.

[0048] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The annular body 22 is an elastic member with elasticity. The opening 21 on the annular body 22 is smaller than the outer diameter of the nut 1. The inner diameter of the annular body 22 in a free state is not larger than the outer diameter of the nut 1 at the knurled groove 11.

[0049] It should be noted that an elastic part refers to a structural part whose material has a certain elasticity. For example, the annular body 22 can be an elastic part made of 60Si2MnA, which is a commonly used alloy spring steel with good elasticity and toughness. Specifically, the numbers in the name "60Si2MnA" represent the approximate content of each alloy element: 60 means that the average carbon content of the steel is about 0.60%; Si2 means that the silicon content is about 2%; Mn means that the manganese content is generally between 0.9% and 1.2%; A usually indicates that this steel is high-quality steel with good mechanical properties. 60Si2MnA can achieve higher strength and toughness through appropriate heat treatment, and is suitable for manufacturing springs that withstand greater stress.

[0050] Of course, in addition to the above-mentioned 60Si2MnA elastic member, the annular body 22 also includes any one of a spring steel annular member, a titanium alloy annular member, and a shape memory alloy annular member, or a combination thereof.

[0051] After the annular body 22 is set as an elastic member, the annular body 22 has a certain elasticity. When installing the annular body 22, an external force is applied by hand or tool to pry the annular body 22 apart from the opening 21 to expand the inner diameter of the annular body 22 so as to sleeve the annular body 22 on the nut 1. Then, the external force is removed and the annular body 22 rebounds and returns to the inner diameter size in the free state by utilizing the elastic performance characteristics of the annular body 22. The inner diameter of the annular body 22 in the free state is not larger than the outer diameter of the nut 1 at the knurled groove 11, so that the annular body 22 can be tightly held on the nut 1.

[0052] Furthermore, the opening 21 on the annular body 22 is smaller than the outer diameter of the nut 1, and the annular body 22 will not be separated from the nut 1 without an external force to expand the opening 21. It can be understood that after the clamp 2 is installed on the nut 1, during the use of the displacement sensor and the hydraulic motor, no external force will be applied to the annular body 22 to expand the opening 21 unless manually operated.

[0053] Furthermore, after the annular body 22 of the clamp 2 is clamped on the nut 1, the clamp 2 is engaged with the clamping groove 23 on the nut 1 through the knurled groove 11, so that the clamp 2 and the nut 1 are limited to each other.

[0054] It should be noted that the knurled groove 11 refers to a groove or texture with a certain geometric shape formed on the inner ring wall surface of the annular body 22 through a knurling process, which is used to increase the friction on the surface of the part, fix the position of the part, and prevent sliding.

[0055] Among them, this embodiment does not specifically limit the appearance of the knurled groove 11. The knurled groove 11 includes any one of a straight groove, a cross groove, a triangular groove, and a star groove, or a combination thereof. Furthermore, the knurled groove 11 also includes a cross groove and a grid groove.

[0056] Of course, the shape of the slot 23 corresponds to the knurled slot 11 , and the slot 23 also includes any one of a straight slot, a cross slot, a triangular slot, a star slot, a cross slot, and a grid slot, or a combination thereof.

[0057] For example, see Figure 1-Figure 4 The knurled groove 11 and the clamping groove 23 are both set as straight grooves, and the length direction of the straight groove is perpendicular to the plane where the annular body 22 is located. When viewed from the nut 1, the clamping groove 23 is opened along the axial direction of the nut 1.

[0058] In some embodiments, after the clamp 2 is clamped onto the nut 1, the anti-rotation baffle 24 on the clamp 2 is clamped onto the mounting plate 5 to prevent relative rotation between the clamp 2 and the mounting plate 5. Figure 1 , Figure 2 and Figure 5 A limiting groove 52 is provided on the mounting plate 5 , and the anti-rotation baffle 24 extends from the annular body 22 toward the mounting plate 5 and is engaged and snap-fitted into the limiting groove 52 .

[0059] After the clamp 2 is clamped onto the nut 1, the position of the anti-rotation baffle 24 on the clamp 2 is adjusted so that the anti-rotation baffle 24 extends into the limiting groove 52. In this way, when an external force drives the clamp 2 to rotate relative to the mounting plate 5, the anti-rotation baffle 24 is inserted into the limiting groove 52, and the limiting groove 52 will block the movement of the anti-rotation baffle 24, thereby preventing the clamp 2 from rotating relative to the mounting plate 5, thereby achieving a limiting effect.

[0060] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The anti-rotation baffle 24 includes a first extension portion 25 and a second extension portion 26 connected to each other in an L-shape. The first extension portion 25 is connected to the annular body 22 and is parallel to the plane where the annular body 22 is located. The second extension portion 26 is perpendicular to the plane where the annular body 22 is located. One anti-rotation baffle 24 is provided at each end of the opening 21.

[0061] Correspondingly, a limiting groove 52 is provided on the mounting plate 5 corresponding to each anti-rotation baffle 24 .

[0062] When installing the clamp 2, open the opening 21 of the clamp 2 by using the circlip pliers, adjust the position of the anti-rotation baffle 24 on the clamp 2 to correspond to the limit groove 52, and put the annular body 22 of the clamp 2 on the knurled groove 11 of the nut 1. At this time, the limit baffle can be automatically inserted into the limit groove 52.

[0063] In some embodiments, the width of the limiting groove 52 is not less than the cross-sectional width of the upper second extension portion 26 of the anti-rotation baffle 24 , that is, the limiting groove 52 is slightly wider than the second extension portion 26 , making it easier for the second extension portion 26 to be inserted into the limiting groove 52 .

[0064] Furthermore, the first extension portion 25, the second extension portion 26 and the annular body 22 are an integral structure, or may be a combination fixed together by bolts.

[0065] In some embodiments, see Figure 1-Figure 3 The side wall of the nut 1 is also provided with a tightening portion 13 for cooperating with a wrench along the circumferential direction. The tightening portion 13 is located on the side of the limiting step 12 away from the knurled groove 11.

[0066] The tightening portion 13 of the nut 1 refers to a portion of the nut 1 that is used to cooperate with a wrench or other tools. The surface of the tightening portion 13 that is used to contact the wrench is designed to be flat, so that the wrench can firmly grasp the nut 1 for rotation.

[0067] Furthermore, the tightening portion 13 comprises a hexagonal shape, and six planes can fit tightly with the hexagonal wrench, providing sufficient contact area to reduce the risk of slipping during use.

[0068] In some embodiments, the tightening portion 13 also includes a dodecagon, which is also called a double hexagon. Six smaller planes are added to the hexagon, providing more contact points, so that the wrench can engage the nut 1 more tightly, reducing the risk of damaging the nut 1.

[0069] Of course, the tightening portion 13 also includes a plum blossom shape or a star shape to be used with a specific tool.

[0070] Further, see Figure 1 , Figure 2 and Figure 7 The fastening mechanism also includes a flat washer 3 , which is sleeved on the screw rod 6 and abuts between the nut 1 and the mounting plate 5 .

[0071] Specifically, the flat washer 3 is a mechanical component used for fasteners (such as bolts, screws or nuts 1) to disperse pressure: the flat washer 3 can disperse the pressure of the bolt or nut 1 on the fastened part to prevent damage to the surface of thin or soft materials due to excessive local pressure. If the surface of the fastened part is uneven, the flat washer 3 can help adjust it so that the fastener can act vertically on the surface to improve the fastening effect. During the assembly process, the flat washer 3 can help position the fastener, making the installation more convenient and quick. It provides a flat contact surface between the fastener and the fastened part.

[0072] Further, see Figure 1 , Figure 2 and Figure 6 The fastening mechanism also includes a spring washer 4, which is sleeved on the screw rod 6 and abuts between the flat washer 3 and the nut 1.

[0073] The spring washer 4, also called a wave washer or a vibration washer, is a washer with spring characteristics. After the spring washer 4 is arranged between the flat washer 3 and the nut 1, the spring washer 4 can prevent the nut 1 from loosening under vibration or dynamic load. The spring washer 4 provides a continuous pressure through its own elasticity and deformation, thereby offsetting the loosening tendency caused by vibration.

[0074] Specifically, when the nut 1 is tightened, the spring washer 4 will be compressed to generate a reaction force, which can prevent the nut 1 from gradually loosening due to vibration.

[0075] In some embodiments, see Figure 1 , Figure 2 and Figure 4 A support block 27 is also provided on one side of the annular body 22 facing the mounting plate 5 . The support block 27 is abutted between the annular body 22 and the mounting plate 5 along the circumference of the flat washer 3 and the spring washer 4 .

[0076] It can be understood that after the flat washer 3 and the spring washer 4 are set, when the nut 1 is tightened, there will be a certain distance between the knurled groove 11 on the nut 1 and the mounting plate 5. This distance is the sum of the thickness of the flat washer 3 and the spring washer 4. When the annular body 22 is sleeved to the position of the knurled groove 11 of the nut 1, there will be a certain distance between the annular body 22 and the pad. After the support block 27 is set, the annular body 22 does not need to be set very thick. The annular body 22 only needs to cover the knurled groove 11, and does not need to cover the flat washer 3 and the spring washer 4. The distance between the knurled groove 11 and the mounting plate 5 will be supported by the support block 27. The support block 27 can share the pressure of the annular body 22, making the structure more stable. In addition, the annular body 22 is provided with multiple support blocks 27 at intervals along the circumference, which can simplify the thickness of the annular body 22, make the annular body 22 set thinner, and save more materials in the structure of the entire hoop 2, thereby achieving the effect of cost saving.

[0077] In some embodiments, see Figure 1 , Figure 2 and Figure 5 The mounting plate 5 includes a first side 53 and a second side 54, both the first side 53 and the second side 54 are provided with a limiting groove 52, the free end of the screw rod 6 passes through the first side 53 of the mounting plate 5 to the second side 54 of the mounting plate 5, and the screw rod 6 is connected to the nut 1 and the clamp 2 on the first side 53 and the second side 54 of the mounting plate 5.

[0078] The first side 53 and the second side 54 of the mounting plate 5 are fastened by nuts 1 and clamps 2, so that the displacement sensor can be more stably connected to the hydraulic motor, further reducing the risk of the displacement sensor falling during use.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A rod-dropping prevention fastening mechanism for a displacement sensor of an oil motor, wherein the oil motor comprises a mounting plate with a threaded through hole, the displacement sensor is provided with a screw, the screw is threadedly engaged with the threaded through hole, the free end of the screw passes through from one side of the mounting plate to the other side of the mounting plate, and is characterized in that: The fastening mechanism comprises: A nut, which is threaded on the free end of the screw rod and abuts against the mounting plate, wherein a side wall of the nut is provided with a knurled groove and a limiting step protruding from the knurled groove along the circumferential direction, and the knurled groove is located between the mounting plate and the limiting step; The clamp comprises an annular main body with an opening, the annular main body is sleeved on the nut through the opening and stops between the limit step and the mounting plate, the inner wall of the annular main body is provided with a slot, the slot is snap-fitted with the knurled groove, and the annular main body is also provided with an anti-rotation baffle, the anti-rotation baffle is snap-fitted with the mounting plate.

2. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 1, characterized in that: The annular body is an elastic member with elasticity, the opening is smaller than the outer diameter of the nut, and the inner diameter of the annular body in a free state is not larger than the outer diameter of the nut at the knurled groove.

3. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 2 is characterized in that: The knurled groove includes any one of a straight groove, a cross groove, a triangular groove, and a star groove, or a combination thereof.

4. The anti-drop rod fastening mechanism for a hydraulic motor displacement sensor according to any one of claims 1 to 3, characterized in that: The mounting plate is provided with a limiting groove, and the anti-rotation baffle extends from the annular body toward the mounting plate and is engaged in the limiting groove.

5. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 4 is characterized in that: The anti-rotation baffle includes a first extension portion and a second extension portion connected to each other in an L-shape, the first extension portion is connected to the annular body and parallel to the plane where the annular body is located, the second extension portion is perpendicular to the plane where the annular body is located, and the anti-rotation baffle is respectively arranged at both ends of the opening.

6. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 4, characterized in that: The side wall of the nut is also provided with a tightening portion for cooperating with a wrench along the circumferential direction, and the tightening portion is located on a side of the limiting step away from the knurled groove.

7. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 1, characterized in that: It also includes a flat washer, which is sleeved on the screw rod and abuts between the nut and the mounting plate.

8. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 7, characterized in that: It also includes a spring washer, which is sleeved on the screw rod and abuts between the flat washer and the nut.

9. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 8, characterized in that: A support block is also provided on one side of the annular body facing the mounting plate, and the support block abuts between the annular body and the mounting plate along the circumference of the flat washer and the spring washer.

10. The anti-drop rod fastening mechanism for the oil motor displacement sensor according to claim 1, characterized in that: The mounting plate includes a first side and a second side, the first side and the second side are both provided with the limiting groove, the free end of the screw rod passes through from the first side of the mounting plate to the second side of the mounting plate, and the screw rod is connected to the nut and the clamp on the first side and the second side of the mounting plate.

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