Resistance type electronic displacement ruler structure

Abstract

The utility model discloses a resistance type electronic displacement ruler structure, which is characterized by comprising a shell, a sliding chute, a resistor disc and a pull rod are arranged in the shell, the outer end of the pull rod extends out of the shell, and a sliding block capable of sliding along the sliding chute is fixed at the inner end of the pull rod. And an electric brush which is always in contact with the resistor disc during sliding is arranged at the bottom of the sliding block. The dustproof sleeve, the O-shaped ring and the positioning piece form a three-stage sealing system, the IP67 protection grade is achieved, the sealing performance is greatly improved, environmental factors such as moisture, moisture, dust and corrosive gas can be effectively prevented from invading the sensor, electronic elements and sensitive parts of the sensor are prevented from being damaged, the internal elements can be kept dry and stable, and the service life of the sensor is prolonged. And the service life is prolonged.

Description

[Technical Field]

[0001] This utility model relates to a resistive electronic displacement ruler structure. [Background Technology]

[0002] Electronic displacement gauges are precision measuring devices used to detect changes in the position of objects, and are widely used in industrial automation, machining, automotive braking systems, and other fields. Based on different operating principles, existing technologies include various types such as capacitive, resistive, inductive, and laser-based displacement gauges.

[0003] A resistive electronic displacement gauge is a commonly used displacement measuring device that measures displacement based on the relationship between the resistance value of a resistive element and the displacement. It typically consists of a resistive element and a movable brush. When the brush moves with the object being measured, its contact position with the resistive element changes, thus altering the resistance value of the resistive element connected in the circuit. According to Ohm's law, under constant voltage, a change in resistance will cause a change in the current or voltage in the circuit. By measuring the change in current or voltage, the displacement of the measured object can be calculated.

[0004] However, existing resistive electronic displacement gauges have complex structures and poor sealing, which affects their service life.

[0005] The information disclosed in the background section is only for enhancing the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. [Utility Model Content]

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a resistive electronic displacement ruler structure that is simple in structure, accurate in measurement, and has good sealing performance.

[0007] This utility model is achieved through the following technical solution:

[0008] A resistive electronic displacement ruler structure is characterized by comprising a housing 1, a sliding groove provided inside the housing 1, a resistive element 2 and a pull rod 3 provided inside the housing 1, the outer end of the pull rod 3 extending out of the housing 1, and a slider 4 that can slide along the sliding groove fixed at the inner end, and a brush 5 that is always in contact with the resistive element 2 when sliding is provided at the bottom of the slider 4.

[0009] The resistive electronic displacement ruler structure described above is characterized in that: the housing 1 is open at both ends, and a front cover 6 and a rear cover 7 are respectively connected to the two ends of the housing 1 by screws; the outer end of the pull rod 3 extends out from the front cover 6; and the housing 1 is provided with a slot for positioning resistor 2.

[0010] The resistive electronic displacement ruler structure described above is characterized in that: a self-lubricating linear bearing 8 is fitted on the pull rod 3, the linear bearing 8 is fixed by a rubber sleeve 9 fitted on it, and a dust cover 10 is fitted on the pull rod 3 and located near the front end cover 6, the dust cover 10 being clamped between the rubber sleeve 9 and the front end cover 6.

[0011] The resistive electronic displacement ruler structure described above is characterized in that: a circular hole 11 is provided on the front end cover 6, the circular hole 11 serves as a guide, the pull rod 3 extends out of the front end cover 6 through the circular hole 11, the dust cover 10 has a V-shaped cross section, one side of the dust cover 10 blocks the gap between the circular hole 11 and the pull rod 3, and the other side abuts against the inner wall of the front end cover 6.

[0012] The resistive electronic displacement ruler structure described above is characterized in that: an O-ring 12 is fitted on the rubber sleeve 9, and a mounting groove 13 for placing the O-ring 12 is provided on the rubber sleeve 9, wherein the O-ring 12 is positioned between the rubber sleeve 9 and the front end cover 6.

[0013] The resistive electronic displacement ruler structure described above is characterized in that: both the front end cover 6 and the rear end cover 7 are provided with end cover gaskets 14, which are clamped between the end cover and the housing 1; a positioning piece 15 is also fitted on the rubber sleeve 9; one side of the positioning piece 15 is abutted by the end cover gasket 14 and the O-ring 12 is positioned by the convex ring portion 16 provided on the other side of the positioning piece 15; the upper end of the positioning piece 15 is abutted by the front end cover 6 and the end cover gasket 14 to position the rubber sleeve 9; and an insertion portion 17 is provided on the positioning piece 15 for the end cover gasket 14 to abut against, which is inserted into the slot of the housing 1 and positioned.

[0014] The resistive electronic displacement ruler structure described above is characterized in that: the brush 5 is thermally riveted to the slider 4, the slider 4 has a central hole, the pull rod 3 passes through the central hole and is fixedly connected to the slider 4 by a retaining spring 18, and a gasket 19 is fitted on both sides of the pull rod 3 located at the central hole, with the retaining spring 18 tightly attached to one of the gaskets 19.

[0015] The resistive electronic displacement ruler structure described above is characterized in that: the slider 4, the housing 1, the front cover 6 and the rear cover 7 are all made of plastic, the pull rod 3 is made of metal, and a resistive layer is coated on the resistive sheet 2.

[0016] The resistive electronic displacement ruler structure described above is characterized in that: a spring groove 20 is provided on the slider 4, the central hole is provided on the bottom surface of the spring groove 20, a buffer spring is provided in the spring groove 20 and sleeved on the pull rod 3, a stepped section with a reduced diameter is provided on the pull rod 3, one end of the buffer spring abuts against the pad 19 on the bottom surface of the spring groove 20, and the other end abuts against the stepped section surface of the pull rod 3.

[0017] The resistive electronic displacement scale structure described above is characterized in that: the rear end cover 7 is provided with a plurality of wiring terminals 21 and an internal stud 22 for connection with the conversion module.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The dust cover, O-ring, and positioning plate of this utility model form a three-level sealing system, achieving an IP67 protection level. The sealing performance is greatly improved, which can effectively prevent environmental factors such as moisture, humidity, dust, and corrosive gases from entering the sensor, avoiding damage to the sensor's electronic components and sensitive parts. It also helps to keep the internal components dry and stable, thereby extending the service life.

[0020] 2. The slider fixing structure with double gaskets and snap rings of this utility model stabilizes the brush pressure within a very small range, ensuring small fluctuations in contact resistance and improving measurement accuracy and resolution.

[0021] 3. The pull rod of this utility model directly drives the slider and brush through the sliding fit between the linear bearing and the housing, eliminating the error caused by traditional multi-stage transmission; by simplifying the internal components and reducing unnecessary connecting parts, the assembly difficulty and cost are reduced. [Attached Image Description]

[0022] Figure 1 This is a perspective view of the utility model;

[0023] Figure 2 This is a plan view of the utility model;

[0024] Figure 3 This is an exploded view of this utility model;

[0025] Figure 4 yes Figure 2 A cross-sectional view along the AA direction;

[0026] Figure 5 yes Figure 2 Cross-sectional view along the BB direction;

[0027] Figure 6 This is one of the perspective views of the positioning piece of this utility model;

[0028] Figure 7This is the second perspective view of the positioning plate of this utility model.

[0029] In the diagram: 1 is the housing; 2 is the resistor element; 3 is the pull rod; 4 is the slider; 5 is the brush; 6 is the front cover; 7 is the rear cover; 8 is the linear bearing; 9 is the rubber sleeve; 10 is the dust cover; 11 is the round hole; 12 is the O-ring; 13 is the mounting groove; 14 is the end cover gasket; 15 is the positioning piece; 16 is the convex ring part; 17 is the plug part; 18 is the snap ring; 19 is the gasket; 20 is the spring groove; 21 is the terminal block; 22 is the internal stud.

Detailed Implementation Methods

[0030] The technical features of this utility model will be further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0031] A resistive electronic displacement gauge structure includes a housing 1, a groove inside the housing 1, a resistive element 2 and a pull rod 3 inside the housing 1, the outer end of the pull rod 3 extending from the housing 1, and a slider 4 fixed to the inner end that can slide along the groove. A brush 5 is provided at the bottom of the slider 4, which is always in contact with the resistive element 2 during sliding. This electronic displacement gauge has a simple overall design and is easy to manufacture and maintain.

[0032] The housing 1 has openings at both ends, and a front cover 6 and a rear cover 7 are respectively connected to the two ends of the housing 1 by screws. The outer end of the pull rod 3 extends from the front cover 6, and the housing 1 has a slot for positioning the resistor 2. The resistor 2 is preferably the same length as the housing 1, so that the two ends of the resistor 2 are clamped and positioned by the front cover 6 and the rear cover 7.

[0033] The resistor element 2 of this utility model has a simple installation structure and a modular end cap design that allows for quick replacement of the resistor element, greatly shortening maintenance time.

[0034] A self-lubricating linear bearing 8 is fitted onto the pull rod 3, and the linear bearing 8 is fixed by a rubber sleeve 9 fitted onto it. A dust cover 10 is fitted onto the pull rod 3 near the front end cover 6, and the dust cover 10 is clamped between the rubber sleeve 9 and the front end cover 6. The linear bearing 8 does not slide with the pull rod 3. The self-lubricating function of the linear bearing 8 reduces friction and lowers maintenance costs.

[0035] A circular hole 11 is provided on the front end cover 6. The pull rod 3 extends out of the front end cover 6 through the circular hole 11. The dust cover 10 has a V-shaped cross-section. One side of the dust cover 10 blocks the gap between the circular hole 11 and the pull rod 3, while the other side abuts against the inner wall of the front end cover 6. This structure makes it difficult for dust to enter, and even if it does, it can only enter the V-shaped groove of the dust cover 10.

[0036] An O-ring 12 is fitted onto the rubber sleeve 9, and a groove 13 is provided on the rubber sleeve 9 for placing the O-ring 12. The O-ring 12 is positioned between the rubber sleeve 9 and the front end cover 6. The O-ring 12 expands under pressure, forming a radial seal between the front end cover 6 and the housing, providing dustproof, waterproof, and oil-proof protection.

[0037] Both the front cover 6 and the rear cover 7 are provided with end cover gaskets 14. The end cover gaskets 14 are clamped between the end cover and the housing 1. A positioning piece 15 is also fitted on the rubber sleeve 9. One side of the positioning piece 15 is abutted by the end cover gasket 14 and the O-ring 12 is positioned by the convex ring portion 16 provided on the other side of the positioning piece 15. The upper end of the positioning piece 15 is abutted by the front cover 6 and the end cover gasket 14 to position the rubber sleeve 9. The positioning piece 15 is provided with an insertion portion 17 for the end cover gasket 14 to abut. The insertion portion 17 is inserted into the slot of the housing 1 and positioned.

[0038] The positioning piece 15 is inserted into the housing slot via the insertion part 17, with its convex ring 16 abutting against the O-ring 12. Its upper end is pressed tightly by the end cap gasket 14. This invention employs a combination structure of a dust cover, O-ring, positioning piece, and end cap gasket, effectively preventing dust, moisture, and oil from entering and extending service life. Simultaneously, it ensures that the pull rod 3 does not wobble during movement, and the insertion structure of the positioning piece 15 also guarantees that the coaxiality error of the components is less than 0.03mm.

[0039] The brush 5 is heat-riveted to the slider 4. The slider 4 has a central hole. The pull rod 3 passes through the central hole and is fixedly connected to the slider 4 by a retaining spring 18. A gasket 19 is fitted on both sides of the pull rod 3 and located at the central hole. The retaining spring 18 is installed close to one of the gaskets 19.

[0040] This invention reduces changes in contact resistance and improves measurement accuracy by optimizing the design of the slider and brush. The slider fixing structure with double gaskets and retaining springs stabilizes the brush pressure within a very small range, ensuring minimal fluctuations in contact resistance.

[0041] The slider 4, the housing 1, the front cover 6 and the rear cover 7 are all made of plastic, the pull rod 3 is made of metal, a resistive layer is coated on the resistive sheet 2, and the brush 5 slides along the resistive layer.

[0042] A spring groove 20 is provided on the slider 4, and the central hole is located on the bottom surface of the spring groove 20. A buffer spring is provided in the spring groove 20 and sleeved on the pull rod 3. The part of the pull rod 3 with the buffer spring sleeved has a smaller diameter. One end of the buffer spring abuts against the pad 19 on the bottom surface of the spring groove 20, and the other end abuts against the pull rod 3.

[0043] The pull rod 3 has a stepped section with a decreasing diameter for mounting a buffer spring (not shown in the figure). The main function of the buffer spring is to absorb mechanical shocks and vibrations, protecting the slider 4 and the resistor element 2, and extending the service life of the equipment. In practical applications, resistive electronic displacement gauges may be affected by external mechanical shocks or vibrations. For example, in industrial automation or automotive braking systems, the equipment may experience sudden displacement or vibration. Without a buffer spring, these shocks would be directly transmitted to the slider 4 and resistor element 2, potentially causing damage to the slider and resistor element, or poor contact between the brush and the resistor element. Although the pull rod 3 and slider 4 are fixedly connected by a retaining ring and washer, in practical applications, a small amount of elastic deformation is allowed between the pull rod 3 and slider 4. This elastic deformation can absorb some of the shocks and vibrations, reducing the impact on the equipment. The buffer spring further enhances this elastic deformation capability, providing better protection.

[0044] By incorporating a buffer spring, these impacts can be effectively absorbed, reducing the direct force on the slider and resistor elements, thus protecting the equipment. The buffer spring can absorb ±1mm of overshoot displacement, significantly extending the brush's lifespan. "Overshoot displacement" in mechanical systems typically refers to movement exceeding a predetermined range. For example, when a mechanical component moves to a target position, due to inertia, it may slightly exceed the target point; this is overshoot. In this case, the buffer spring's function is to absorb this excess displacement, preventing damage to the slider and resistor elements.

[0045] The rear end cover 7 is provided with multiple terminals 21 and internal studs 22 for connection with the conversion module. The conversion module is used to convert the relationship between resistance value and displacement into an electrical signal output.

[0046] This utility model's resistive electronic displacement gauge achieves high-precision and high-reliability measurement through optimized design. In practical applications, such as automotive braking systems, this device can accurately detect changes in the brake pedal position, providing reliable signal output and ensuring driving safety. Furthermore, its sealing and self-lubricating properties allow it to operate stably even in harsh environments, resulting in a long service life.

[0047] The embodiments described herein are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A resistive electronic displacement gauge structure, characterized by: The utility model relates to a slide rule, including shell (1), be equipped with the chute in shell (1), be equipped with resistance sheet (2) and pull rod (3) in shell (1), pull rod (3) outer end from shell (1) stretch out, inner end is fixed with the slider (4) that can slide along the chute, be equipped with the wiper (5) that always contacts with resistance sheet (2) when sliding in the bottom of slider (4).

2. The resistive electronic displacement gauge structure of claim 1, wherein: The both ends of the shell (1) are open, and the front end cover (6) and the rear end cover (7) are connected to the both ends of the shell (1) through screws respectively, the outer end of the pull rod (3) stretches out from the front end cover (6), and the shell (1) is equipped with a clamping groove for positioning the resistance sheet (2).

3. The resistive electronic displacement gauge structure of claim 2, wherein: The pull rod (3) is sleeved with a self-lubricating linear bearing (8), the linear bearing (8) is fixed by a rubber sleeve (9) sleeved thereon, and a dustproof sleeve (10) is sleeved on the pull rod (3) and located close to the front end cover (6), and the dustproof sleeve (10) is clamped between the rubber sleeve (9) and the front end cover (6).

4. The resistive electronic displacement gauge structure of claim 3, wherein: A round hole (11) is arranged on the front end cover (6), the pull rod (3) passes through the round hole (11) and stretches out of the front end cover (6), the cross section of the dustproof sleeve (10) is V-shaped, one side of the dustproof sleeve (10) blocks the gap between the round hole (11) and the pull rod (3), and the other side abuts against the inner wall of the front end cover (6).

5. The resistive electronic displacement gauge structure of claim 3, wherein: An O-shaped ring (12) is sleeved on the rubber sleeve (9), a placing groove (13) for placing the O-shaped ring (12) is arranged on the rubber sleeve (9), and the O-shaped ring (12) is positioned between the rubber sleeve (9) and the front end cover (6).

6. The resistive electronic displacement gauge structure of claim 5, wherein: End cover gaskets (14) are arranged on the front end cover (6) and the rear end cover (7), the end cover gaskets (14) are clamped between the end covers and the shell (1), a positioning piece (15) is further sleeved on the rubber sleeve (9), one side of the positioning piece (15) is abutted by the end cover gasket (14), the O-shaped ring (12) is positioned through the convex ring part (16) arranged on the other side of the positioning piece (15), the upper end of the positioning piece (15) is abutted by the front end cover (6) and the end cover gasket (14), so that the rubber sleeve (9) is positioned, a plug-in part (17) for abutting against the end cover gasket (14) is arranged on the positioning piece (15), and the plug-in part (17) is inserted into the clamping groove of the shell (1) and positioned.

7. The resistive electronic displacement gauge structure of claim 1, wherein: The wiper (5) is hot riveted on the slider (4), a central hole is arranged on the slider (4), the pull rod (3) passes through the central hole and is fixedly connected with the slider (4) through a clamping spring (18), and gaskets (19) are sleeved on the pull rod (3) and located on both sides of the central hole, and the clamping spring (18) is installed in close contact with one of the gaskets (19).

8. The resistive electronic displacement gauge structure of claim 2, wherein: The materials of the slider (4), the shell (1), the front end cover (6) and the rear end cover (7) are plastic, the material of the pull rod (3) is metal, and resistance glue is coated on the resistance sheet (2).

9. The resistive electronic displacement gauge structure of claim 7, wherein: A spring slot (20) is arranged on the slider (4), the central hole is arranged on the bottom surface of the spring slot (20), a buffer spring is arranged in the spring slot (20) and is sleeved on the pull rod (3), a stepped section with a reduced diameter is arranged on the pull rod (3), one end of the buffer spring is abutted against the gasket (19) on the bottom surface of the spring slot (20), and the other end is abutted against the stepped section surface of the pull rod (3).

10. The resistive electronic displacement gauge structure of claim 2, wherein: A plurality of wire terminals (21) and inner studs (22) for connecting with the conversion module are arranged on the rear end cover (7).

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