Ceramic piston rod sensor with double-channel square wave signal output

Abstract

The invention relates to the technical field of ceramic piston rod sensors, in particular to a double-channel square wave signal output ceramic piston rod sensor which comprises a sensor body, a base and a mounting pipe, the sensor body is movably mounted in the mounting pipe, and a first receding hole allowing the sensor body to penetrate is formed in the bottom end of the base in a penetrating mode. Sealing pieces are symmetrically and movably arranged on the two sides of the interior of the base, driving mechanisms for driving the two sealing pieces to move towards the two sides are arranged on the two sides of the interior of the base correspondingly, each driving mechanism comprises a first sliding block and a second sliding block, and fixing bolts are rotationally arranged on the second sliding blocks correspondingly; second receding holes coaxial with the fixing bolts are formed in the upper side and the lower side of the base in a penetrating mode, two elastic reset mechanisms pushing the sealing piece to move towards the middle are arranged on the two sides of the interior of the base correspondingly, and the situation that the sensor is damaged due to the fact that the sensor adsorbs an unfixed ferromagnetic part and impacts the measuring surface of the sensor in the disassembling and assembling process can be avoided. The protection performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic piston rod sensors, in particular to a dual-channel square wave signal output ceramic piston rod sensor. Background Art

[0002] The dual-channel square wave signal output ceramic piston rod sensor outputs the corresponding level signal by sensing the arrangement of the grooves (magnetic material) at the bottom of the ceramic covering layer of the ceramic piston rod, and forms a complete ceramic piston rod position stroke measurement system or speed measurement system by connecting the corresponding external equipment. Since the sensor gives two square wave signals with a certain phase difference, it can distinguish between positive and negative rotation; the high frequency can be as high as 20KHz, the low frequency can be as low as 0Hz, and the output waveform is a square wave of about 50%.

[0003] The ceramic piston rod sensor is a highly sensitive measuring device. The measuring element is installed under the housing part close to the flat part of the sensor. Any physical impact on the surface may cause the measuring system to fail. Therefore, it is necessary to avoid any hard objects from contacting the sensor surface before installation. At the same time, the sensor contains a strong magnet. When it is removed from the measuring system, it may cause impact due to the attraction to metal parts, causing damage to the measuring surface. The existing dual-channel square wave signal output ceramic piston rod sensor is generally protected by a plastic protective cover on the outside. When it is removed from the system, it also needs to be manually gripped and prevented from being adsorbed on the sensor by unfixed ferromagnetic parts around it, causing damage to the measuring surface. The protection is low. Summary of the invention

[0004] The object of the present invention is to provide a dual-channel square wave signal output ceramic piston rod sensor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dual-channel square wave signal output ceramic piston rod sensor, comprising a sensor body, a base and a mounting tube fixed in the middle of the top of the base, the mounting tube is connected to the inside of the base, the sensor body is movably mounted in the mounting tube up and down, the bottom end of the base is penetrated with a first clearance hole for accommodating the sensor body, and the two sides of the base are symmetrically and movably arranged with sealing members for sealing the bottom end of the mounting tube, and the two sides of the base are respectively provided with driving mechanisms for driving the two sealing members to move to both sides, and the driving mechanism comprises a first slider horizontally slidably arranged at the bottom end of the base and a second slider slidably arranged in the base, the first slider is fixedly connected to one side of the sealing member, the second slider is located above the first slider, and the first slider and the second slider are respectively provided with mutually parallel first and second inclined surfaces on opposite sides, the second inclined surface slides downward along the surface of the first inclined surface to push the first slider to move to the side away from the center of the base, and the second slider is rotatably provided with fixing bolts, the upper and lower sides of the base are penetrated with second clearance holes coaxial with the fixing bolts, and the two sides of the base are respectively provided with two elastic reset mechanisms for pushing the sealing member to move to the middle.

[0006] Furthermore, the sensor body is threadedly connected to the mounting tube, and the top end of the sensor body extends to the outside of the mounting tube, and a limit ring is provided on the outer peripheral wall of the sensor body.

[0007] Furthermore, a guide vertical rod is vertically fixed to the bottom end of the base, a sliding hole matching the guide vertical rod is penetrated on the second slider, and the top of the guide vertical rod extends through the sliding hole to the top of the second slider and is fixed with a first limit plate.

[0008] Furthermore, the seal includes a sealing baffle abutting the bottom end of the mounting tube and a supporting vertical plate vertically fixed to the bottom end of the sealing baffle, the bottom end of the supporting vertical plate is fixedly connected to one side of the first slider through a connecting plate, and the two sealing baffles are spliced ​​to form a complete baffle, so that a sealed cavity is formed inside the mounting tube.

[0009] Furthermore, the two connecting plates are spliced ​​to form a complete baffle plate for sealing and shielding the first clearance hole.

[0010] Furthermore, the elastic reset mechanism includes a guide cross bar horizontally fixed on one side of the supporting vertical plate, a reset spring sleeved on the guide cross bar and a fixed plate fixed inside the base, the fixed plate is penetrated by a through hole matching the guide cross bar, and the reset spring is arranged between the second limit plate and the supporting vertical plate to push the seal to reset to the middle.

[0011] Furthermore, one end of the guide cross bar extends to a side of the fixing plate away from the return spring and is fixed with a second limiting plate.

[0012] Furthermore, a sealing rubber pad is arranged inside the second clearance hole, and an opening is arranged on the sealing rubber pad.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting a base, a mounting tube, a seal, a driving mechanism, a fixing bolt and an elastic reset mechanism, the sensor body is movably installed inside the mounting tube; under the elastic support of the elastic reset mechanism, the seal seals the bottom end of the mounting tube, thereby protecting the sensor body; when assembling the sensor body, the seal can be automatically opened to both sides by rotating the fixing bolt, so that the sensor body is inserted downward into the mounting system; when disassembling the sensor body, the seal can be closed by loosening the fixing bolt to seal and shield the sensor body, thereby avoiding adsorption of unfixed ferromagnetic parts, impacting the sensor measurement surface, and causing damage to the sensor; the sensor body has high protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 3 It is the explosion schematic diagram of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the elastic reset mechanism of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing member of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the sealing member of the present invention in an open state; Figure 7 It is a schematic diagram of the cross-sectional structure of the sealing member of the present invention in the open and closed states.

[0015] In the figure: 1. base; 101. first clearance hole; 102. second clearance hole; 2. mounting tube; 3. sensor body; 301. limiting ring; 302. threaded section; 4. sealing member; 401. sealing baffle; 402. supporting vertical plate; 403. connecting plate; 5. driving mechanism; 501. first slider; 5011. first inclined plane; 502. second slider; 5021. second inclined plane; 503. guide vertical rod; 5031. first limiting plate; 6. fixing bolt; 7. elastic reset mechanism; 701. guide cross rod; 702. reset spring; 703. fixing plate; 704. second limiting plate. DETAILED DESCRIPTION

[0016] 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. In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In order to make the terms "including" and any variations of them in the specification and claims of the present invention and the above-mentioned drawings, it is intended to cover non-exclusive inclusions.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] See also Figure 1-7, an embodiment provided by the present invention: a dual-channel square wave signal output ceramic piston rod sensor, including a sensor body 3, the internal structure of the sensor body 3 is the existing technology and is not described in detail here, and also includes a base 1 and a cylindrical mounting tube 2 fixed in the middle of the top of the base 1, the mounting tube 2 is connected to the inside of the base 1, and the sensor body 3 is movably installed in the mounting tube 2 up and down. Specifically, the base 1 includes an upper cover shell and a bottom plate detachably installed at the bottom end of the upper cover shell by bolts. The bottom end of the base 1 is penetrated by a first clearance hole 101 for accommodating the sensor body 3 to pass through. The first clearance hole 101 is specifically a circular through hole. The sensor body 3 is threadedly connected to the mounting tube 2, and the top of the sensor body 3 extends to the outside of the mounting tube 2. The sensor body 3 is used to connect external cables. A limit ring 301 is arranged on the outer peripheral wall of the sensor body 3. Specifically, the sensor body 3 is a cylindrical structure. A threaded section 302 is arranged on its outer side wall. The top of the mounting tube 2 is provided with an internal thread matching therewith. The limit ring 301 is arranged on the sensor body 3 inside the mounting tube 2 to play a limiting role to prevent the sensor body 3 from being separated from the mounting tube 2. During assembly, the sensor body 3 can be driven to move up and down inside the mounting tube 2 by rotating it, so that it can be inserted downward into the fixing device of the system for detection. At the same time, the distance between the bottom end of the sensor body 3 and the ceramic piston rod can be adjusted as needed to avoid excessive gap, which may cause the output pulse to be lost or even no output signal.

[0019] The base 1 has seals 4 symmetrically disposed on both sides thereof for sealing the bottom end of the mounting tube 2. Figure 5 The sealing member 4 comprises a semicircular sealing baffle 401 abutting against the bottom end of the mounting tube 2 and a supporting vertical plate 402 vertically fixed to the bottom end of the sealing baffle 401. The bottom end of the supporting vertical plate 402 is fixedly connected to one side of the first slider 501 through a connecting plate 403. The two sealing baffles 401 are spliced ​​to form a complete circular baffle. The radius of the circular plate is larger than the radius of the bottom end of the mounting tube 2, ensuring that a closed cavity can be formed inside the mounting tube 2. The sealing baffle 401 is tightly attached to the top end of the base 1, that is, the bottom end of the mounting tube 2, and the connecting plate 403 is tightly attached to the bottom end of the base 1. In order to improve the stability of the horizontal movement of the sealing member 4, the connecting plate 403 or the sealing baffle 401 can be horizontally slidably connected to the base 1 through a slide rail.

[0020] Furthermore, the two connecting plates 403 are spliced ​​to form a complete baffle, which is used to seal and shield the first clearance hole 101 at the bottom end of the base 1, thereby preventing external ferromagnetic parts from entering the interior of the base 1 through the first clearance hole 101.

[0021] The base 1 has two sides inside which driving mechanisms 5 for driving the two sealing members 4 to move to the two sides, and the driving mechanisms 5 include a first slider 501 horizontally slidably arranged at the bottom end of the base 1 and a second slider 502 slidably arranged at the bottom end of the base 1. Two guide vertical rods 503 are vertically fixed at the bottom end of the base 1. The second slider 502 is provided with sliding holes matching the guide vertical rods 503. The top end of the guide vertical rod 503 passes through the sliding holes and extends to the top end of the second slider 502 and is fixed with a first limiting plate 5031, which plays a role of guiding and limiting, so that the second slider 50 2 can only move vertically up and down along the guide vertical rod 503. The first slider 501 is fixedly connected to one side of the connecting plate 403 so that it can move horizontally synchronously with the sealing member 4. The second slider 502 is located above the first slider 501. The first slider 501 and the second slider 502 are respectively provided with a first inclined surface 5011 and a second inclined surface 5021 parallel to each other on the opposite sides. The second inclined surface 5021 slides downward along the surface of the first inclined surface 5011 to push the first slider 501 to move to the side away from the center of the base 1. The second slider 502 is rotatably provided with a fixing bolt 6. See the attached Figure 4 , two first sliders 501 are arranged in parallel, and the two sides of the bottom end of the second slider 502 are respectively overlapped on the top of the two first sliders 501, and the two guide vertical rods 503 are installed between the two first sliders 501. The fixing bolt 6 is rotatably installed in the middle of the second slider 502 through the annular slide rail, and the bottom end of the fixing bolt 6 extends to the bottom end of the second slider 502, so that it can move up and down synchronously with the second slider 502, and can rotate relative to each other at the same time. A gap is reserved between the two first sliders 501 to accommodate the up and down movement of the fixing bolt 6. Second clearance holes 102 coaxial with the fixing bolt 6 are provided on the upper and lower sides of the base 1. Use a screwdriver to insert the second clearance hole 102, and then rotate the fixing bolt 6 to thread it with the fixing device of the system, thereby realizing the installation and fixation of the base 1, and then realizing the fixation of the sensor body 3.

[0022] Furthermore, a sealing rubber pad is provided on the inner side of the second clearance hole 102, and an opening is provided on the sealing rubber pad to facilitate the use of tools to be inserted into the second clearance hole 102 and the bottom end of the fixing bolt 6 extends to the outside of the base 1. During transportation, the sealing rubber pad automatically seals the second clearance hole 102.

[0023] Reference Figure 4Two elastic reset mechanisms 7 for pushing the seal 4 to move toward the middle are respectively provided on both sides of the interior of the base 1. The elastic reset mechanism 7 includes a guide cross bar 701 horizontally fixed on one side of the supporting vertical plate 402, a reset spring 702 sleeved on the guide cross bar 701 and a fixed plate 703 fixed inside the base 1. The fixed plate 703 is penetrated with a through hole that matches the guide cross bar 701. The reset spring 702 is arranged between the second limit plate 704 and the supporting vertical plate 402, and is used to push the seal 4 to reset to the middle. Specifically, the two sides of the fixed plate 703 are respectively fixedly connected to the inner peripheral wall of the upper cover shell of the base 1, and the upper and lower ends thereof are reserved with gaps for accommodating the sealing baffle 401 and the connecting plate 403 to slide horizontally. In the normal state, under the elastic support of the reset spring 702, the two seals 4 are tightly together to achieve the sealing of the mounting tube 2. When the two seals 4 move to both sides respectively, the reset springs 702 are compressed to both sides respectively.

[0024] Furthermore, one end of the guide cross bar 701 extends to a side of the fixing plate 703 away from the return spring 702 and is fixed with a second limiting plate 704 , which can play a limiting role and prevent the two sealing members 4 from deviating from the mounting tube 2 .

[0025] Working principle: During assembly, align the second clearance hole 102 with the threaded hole of the system fixing device, and directly use a screwdriver or other tool to insert downward into the second clearance hole 102. First, use the screwdriver to press down the fixing bolt 6. The fixing bolt 6 pushes the second slider 502 to move vertically downward along the length direction of the guide vertical rod 503. The second inclined surface 5021 slides on the surface of the first inclined surface 5011, driving the first slider 501 and the sealing member 4 to move synchronously to both sides. At this time, the support vertical plate 402 compresses the reset spring 702 to both sides respectively until the second slider 502 is pushed to the lowest end. Refer to the attached Figure 6-7 At this time, the sensor body 3 can be extended from the bottom end of the mounting tube 2, and then the fixing bolt 6 is rotated. The bottom end of the fixing bolt 6 passes through the second clearance hole 102 at the bottom end of the base 1 and is threadedly connected to the fixing device. Finally, the sensor body 3 is rotated downward, so that the bottom end of the sensor body 3 is inserted into the fixing device of the system (not shown in the figure) for detection, and the corresponding level signal is output by sensing the arrangement of the grooves (magnetic material) at the bottom of the ceramic covering layer of the ceramic piston rod. When the sensor body 3 needs to be disassembled, the sensor body 3 needs to be rotated in the opposite direction to make the sensor body 3 retract into the inside of the mounting tube 2, and then the fixing bolt 6 is rotated in the opposite direction to separate from the fixing device. At this time, the reset spring 702 pushes the seal 4 to move toward the middle, and the two seals 4 abut against the bottom end of the mounting tube 2, so that a sealed cavity is formed inside the mounting tube 2, which plays a protective role and prevents the sensor body 3 from being damaged by impact due to the adsorption of ferromagnetic parts. At the same time, the first slider 501 and the seal 4 move toward the middle synchronously, and the second slider 502 moves upward along the length direction of the guide vertical rod 503 to reset.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A dual-channel square wave signal output ceramic piston rod sensor, comprising a sensor body (3), characterized in that: The sensor body (3) is movably mounted in the mounting tube (2) at the top of the mounting tube (2), the mounting tube (2) being connected to the inside of the mounting tube (1), the sensor body (3) being movably mounted in the mounting tube (2) up and down, the bottom end of the mounting tube (1) being provided with a first clearance hole (101) for accommodating the sensor body (3) to pass through, the bottom end of the mounting tube (1) being provided with sealing members (4) for sealing the bottom end of the mounting tube (2) being symmetrically and movably arranged on both sides of the base (1), the base (1) being provided with driving mechanisms (5) for driving the two sealing members (4) to move to both sides, the driving mechanisms (5) comprising a first slider (501) being horizontally slidably arranged at the bottom end of the base (1) and a second slider (502) being slidably arranged in the base (1), the first slider ( 501) is fixedly connected to one side of the sealing member (4), the second slider (502) is located above the first slider (501), and the first slider (501) and the second slider (502) are respectively provided with a first inclined surface (5011) and a second inclined surface (5021) parallel to each other on opposite sides, the second inclined surface (5021) slides downward along the surface of the first inclined surface (5011) to push the first slider (501) to move to a side away from the center of the base (1), the second slider (502) is rotatably provided with a fixing bolt (6), the base (1) is penetrated by a second clearance hole (102) coaxial with the fixing bolt (6), and the base (1) is respectively provided with two elastic reset mechanisms (7) on both sides of the inside thereof for pushing the sealing member (4) to move toward the middle.

2. The dual-channel square wave signal output ceramic piston rod sensor according to claim 1, characterized in that: The sensor body (3) is threadedly connected to the mounting tube (2), and the top end of the sensor body (3) extends to the outside of the mounting tube (2), and a limit ring (301) is provided on the outer peripheral wall of the sensor body (3).

3. The dual-channel square wave signal output ceramic piston rod sensor according to claim 1, characterized in that: A guide vertical rod (503) is vertically fixed to the bottom end of the base (1); a sliding hole matching the guide vertical rod (503) is provided through the second sliding block (502); the top end of the guide vertical rod (503) passes through the sliding hole and extends to the top end of the second sliding block (502) and is fixed with a first limiting plate (5031).

4. The dual-channel square wave signal output ceramic piston rod sensor according to claim 1, characterized in that: The sealing member (4) comprises a sealing baffle (401) abutting against the bottom end of the mounting tube (2) and a supporting vertical plate (402) vertically fixed to the bottom end of the sealing baffle (401); the bottom end of the supporting vertical plate (402) is fixedly connected to one side of the first sliding block (501) via a connecting plate (403); the two sealing baffles (401) are spliced ​​together to form a complete baffle, so that a sealed cavity is formed inside the mounting tube (2).

5. The dual-channel square wave signal output ceramic piston rod sensor according to claim 4, characterized in that: The two connecting plates (403) are spliced ​​together to form a complete baffle plate, which is used to seal and shield the first clearance hole (101).

6. The dual-channel square wave signal output ceramic piston rod sensor according to claim 4, characterized in that: The elastic reset mechanism (7) comprises a guide cross bar (701) fixed horizontally to one side of the support vertical plate (402), a reset spring (702) sleeved on the guide cross bar (701), and a fixed plate (703) fixed inside the base (1); the fixed plate (703) is provided with a through hole matching the guide cross bar (701); the reset spring (702) is arranged between the second limit plate (704) and the support vertical plate (402) and is used to push the sealing member (4) to reset to the middle.

7. The dual-channel square wave signal output ceramic piston rod sensor according to claim 6, characterized in that: One end of the guide cross bar (701) extends to a side of the fixing plate (703) away from the return spring (702) and is fixed with a second limiting plate (704).

8. The dual-channel square wave signal output ceramic piston rod sensor according to claim 1, characterized in that: A sealing rubber pad is provided inside each of the second clearance holes (102), and an opening is provided on the sealing rubber pad.

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