Built-in cylinder displacement sensor

Abstract

The utility model relates to a built-in cylinder displacement sensor, and belongs to the field of sensors. Comprising a measuring rod mechanism, a sliding mechanism, a tension spring, a main shell, a cylinder mechanism, a rear-end mechanism, a front-end mechanism, a circuit board and a shell, the rear-end mechanism and the front-end mechanism are arranged at the rear end and the front end of the main shell in a one-to-one correspondence mode, the measuring rod mechanism is fixedly connected with the sliding mechanism and movably penetrates through the main shell and the front-end mechanism, the tension spring and the sliding mechanism are both arranged in the main shell, and the tension spring is arranged in the main shell. One end of the tension spring is fixedly connected with the inner wall of the main shell, the other end of the tension spring is connected with the sliding mechanism, and the air cylinder mechanism penetrates through the rear end mechanism and the main shell and is connected with the sliding mechanism. According to the utility model, a clean working space is ensured in the main shell, and the failure rate is reduced; and an unstable power gas source is prevented from providing power for the push-out of the measuring rod mechanism, so that the measurement is safer, more stable and more accurate.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a built-in cylinder displacement sensor. Background Art

[0002] At present, most of the position sensors used in the market are embedded in the cylinder, which uses an air gap seal to drive the movement of the measuring rod. This structure causes the compressed air as the power to flow through the space inside the probe. The compressed air contacts all mechanical parts and electronic components. When the compressed air is not clean enough, it will contain a certain amount of water and oil particles, which will cause contamination and corrosion of the moving parts, resulting in poor movement of the measuring rod and affecting measurement accuracy. In addition, the compressed air will supply power to different power equipment at the same time, which will cause air pressure fluctuations. When the air pressure becomes larger, it will push the measuring rod to move rapidly and vigorously, thus increasing the measurement error and making the test results untrue. In severe cases, it may even damage the measuring probe and injure the workpiece being measured. In addition, the measuring probe made with this structure is relatively large, which is not conducive to the use of small measurement spaces. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a built-in cylinder displacement sensor to solve the above problems.

[0004] The technical solution of the utility model for solving the above-mentioned technical problems is as follows: A built-in cylinder displacement sensor, comprising: a measuring rod mechanism, a sliding mechanism, a tension spring, a main shell, a cylinder mechanism, a rear end mechanism, a front end mechanism, a circuit board and a shell; the rear end mechanism and the front end mechanism are arranged at the rear end and the front end of the main shell in a one-to-one correspondence, the measuring rod mechanism is fixedly connected to the sliding mechanism, the measuring rod mechanism can movably pass through the main shell and the front end mechanism, the tension spring and the sliding mechanism are both arranged inside the main shell, one end of the tension spring is fixedly connected to the inner wall of the main shell, and the other end is connected to the sliding mechanism, the circuit board is installed in the main shell and connected to the sliding mechanism, the shell is installed at the top end of the main shell, the cylinder mechanism passes through the rear end mechanism and the main shell, and is connected to the sliding mechanism.

[0005] The beneficial effects of the present utility model are as follows: the power air source is arranged in the cylinder mechanism, and at the same time, the power air source in the cylinder mechanism shares the air inlet and outlet ports, which can be effectively isolated from the measuring rod mechanism and the sliding mechanism in the main shell, thereby ensuring a clean working space inside the main shell and reducing the failure rate; in the measuring state, the sliding mechanism and the measuring rod mechanism are pushed out by the rebound force of the tension spring, avoiding the unstable power air source from providing power for the pushing out of the measuring rod mechanism, making the measurement safer, more stable and accurate; the cylinder mechanism is arranged on the rear end side wall of the main shell, making the maintenance and replacement of the cylinder more convenient.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the measuring rod mechanism includes: a measuring rod, a dust cover and a measuring head; the measuring rod passes through the front end side wall of the main shell and the front end mechanism, the dust cover is arranged on the part of the measuring rod after passing through the front end mechanism, and the measuring rod is installed at the end of the measuring rod arranged outside the main shell.

[0008] The beneficial effect of adopting the above-mentioned further scheme is that the measuring rod is conducive to being pushed out under the action of the rebound force of the tension spring, so that the measuring probe at the end contacts the workpiece to be measured, and then the position measurement is achieved under the joint action of the sensor and the circuit board, and the dust cover is conducive to preventing the measuring rod outside the main shell from being contaminated by the external environment.

[0009] Furthermore, the sliding mechanism includes: two sliding rod seats, a sliding rod and two sensors; the two sliding rod seats are fixedly mounted on the measuring rod, the two ends of the sliding rod are connected to the side walls of the two sliding rod seats in a one-to-one correspondence, the two sensors are installed on the top ends of the two sliding rod seats in a one-to-one correspondence, and the sensors are connected to the circuit board.

[0010] The beneficial effects of adopting the above-mentioned further scheme are: the sliding rod seat is fixedly sleeved on the measuring rod, which is conducive to fixing the measuring rod mechanism and the sliding mechanism to form a whole, and then retracting or pushing out together under the pulling force of the cylinder mechanism and the rebound force of the tension spring; the sensor combined with the circuit board is conducive to realizing the measurement of displacement.

[0011] Furthermore, one end of the tension spring is fixedly connected to the front inner wall of the main shell, and the other end is fixedly connected to the slide rod seat at the rear end.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that when the cylinder mechanism is ventilated, the cylinder mechanism can be quickly separated from the slide rod seat by quickly pushing out the cylinder, and at the same time, the sliding mechanism and the measuring rod mechanism can be pushed out under the action of the rebound force of the tension spring, so that the measuring head can contact the object to be measured.

[0013] Furthermore, a cylinder push rod limit block is provided on the side wall of the slide rod seat at the rear end, and a limit groove is provided on the top end of the cylinder push rod limit block along the front-back direction, and the cylinder mechanism is slidably provided in the limit groove.

[0014] The beneficial effects of adopting the above-mentioned further scheme are: the sliding connection between the limit groove and the cylinder mechanism is conducive to the cylinder mechanism driving the sliding mechanism and the measuring rod mechanism to retreat to the rear end under the action of the spring rebound force inside the cylinder when the cylinder is not ventilated; when the cylinder is ventilated, the rapid push-out of the cylinder is utilized to cause the tension spring to apply a forward thrust to the sliding mechanism and the measuring rod mechanism.

[0015] Furthermore, the cylinder mechanism includes: a cylinder push rod, a sliding rod seat lifting cap and a cylinder body; the cylinder body is installed on the rear end mechanism and connected to the cylinder push rod, the sliding rod seat lifting cap is arranged at one end of the cylinder push rod away from the cylinder body, the cylinder push rod is arranged in the limiting groove, and the sliding rod seat lifting cap is movably abutted against the cylinder push rod limiting block.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that the introduction of the power air source into the cylinder body is conducive to driving the cylinder push rod and the sliding rod seat lifting cap to be pushed out, and at the same time, the power air source only exists in the cylinder body and will not cause pollution to the measuring rod mechanism and the sliding mechanism inside the main shell; when the cylinder body is not ventilated, the spring inside the cylinder body uses its rebound force to make the cylinder push rod and the sliding rod seat lifting cap retreat until the sliding rod seat lifting cap abuts against the side wall of the cylinder push rod limit block; when the cylinder body is ventilated, the cylinder body quickly drives the cylinder push rod and the sliding rod seat lifting cap to be pushed out, so that the sliding rod seat lifting cap is quickly separated from the side wall of the cylinder push rod limit block. At this time, the rebound force of the tension spring is applied to the sliding rod seat, driving the measuring rod mechanism and the sliding mechanism to be pushed forward until they contact the object to be measured.

[0017] Furthermore, the rear end mechanism includes: a rear end sealing sheet, a rear end cover plate and an aviation socket; the rear end sealing sheet is arranged between the rear end outer wall of the main shell and the rear end cover plate, the aviation socket passes through the rear end cover plate and the rear end sealing sheet, and is installed at the rear end of the main shell, and the cylinder body passes through the rear end cover plate, the rear end sealing sheet and the rear end side wall of the main shell.

[0018] The beneficial effects of adopting the above further solution are: the rear end sealing sheet and the rear end cover plate are conducive to ensuring the rear end sealing and stability of the main shell, and the aviation socket is conducive to providing the necessary data line and power line connections for measurement.

[0019] Furthermore, the front end mechanism includes: a front end sealing piece, a front end cover plate and a steel sleeve; the steel sleeve is a tubular structure passing through the front end sealing piece, the front end cover plate and the front end side wall of the main shell, and the measuring rod passes through the steel sleeve.

[0020] The beneficial effects of adopting the above further solution are: the front sealing sheet and the front cover plate are conducive to ensuring the front sealing and stability of the main shell, and the steel sleeve is conducive to providing guidance for the displacement of the measuring rod when it is pushed out. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded schematic diagram of the overall structure provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the overall structure of an embodiment of the present utility model after opening the circuit board and the housing;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle.

[0024] in, Figure 1 The double-headed arrows in the figure indicate the installation positions of the components.

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Measuring rod mechanism; 2. Sliding mechanism; 3. Tension spring; 4. Main housing; 5. Cylinder mechanism; 6. Rear end mechanism; 7. Front end mechanism; 8. Circuit board; 9. Housing; 11. Measuring rod; 12. Dust cover; 13. Probe; 21. Sliding rod seat; 22. Sliding rod; 23. Sensor; 51. Cylinder push rod; 52. Sliding rod seat lifting cap; 61. Rear end sealing piece; 62. Rear end cover; 63. Aviation socket; 71. Front end sealing piece; 72. Front end cover; 73. Steel sleeve; 211. Cylinder push rod limit block. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] like Figures 1 to 3 As shown, a built-in cylinder displacement sensor includes: a measuring rod mechanism 1, a sliding mechanism 2, a tension spring 3, a main shell 4, a cylinder mechanism 5, a rear end mechanism 6, a front end mechanism 7, a circuit board 8 and a shell 9; the rear end mechanism 6 and the front end mechanism 7 are arranged at the rear end and the front end of the main shell 4 in a one-to-one correspondence, the measuring rod mechanism 1 is fixedly connected to the sliding mechanism 2, the measuring rod mechanism 1 can movably pass through the main shell 4 and the front end mechanism 7, the tension spring 3 and the sliding mechanism 2 are both arranged inside the main shell 4, one end of the tension spring 3 is fixedly connected to the inner wall of the main shell 4, and the other end is connected to the sliding mechanism 2, the circuit board 8 is installed in the main shell 4 and is connected to the sliding mechanism 2, the shell 9 is installed at the top end of the main shell 4, the cylinder mechanism 5 passes through the rear end mechanism 6 and the main shell 4, and is connected to the sliding mechanism 2.

[0029] Among them, it should be noted that: in the technical solution of the present invention, the circuit board 8 cooperates with the sensor 22 in the sliding mechanism 2 and the probe 13 in the measuring rod mechanism 1 to realize the measurement of the signal, which belongs to the existing technology and is not an innovation point of the present application, so it is not described in detail.

[0030] The beneficial effects of the present utility model are as follows: the power air source is arranged in the cylinder mechanism, and at the same time, the power air source in the cylinder mechanism shares the air inlet and outlet ports, which can be effectively isolated from the measuring rod mechanism and the sliding mechanism in the main shell, thereby ensuring a clean working space inside the main shell and reducing the failure rate; in the measuring state, the sliding mechanism and the measuring rod mechanism are pushed out by the rebound force of the tension spring, avoiding the unstable power air source from providing power for the pushing out of the measuring rod mechanism, making the measurement safer, more stable and accurate; the cylinder mechanism is arranged on the rear end side wall of the main shell, making the maintenance and replacement of the cylinder more convenient.

[0031] Preferably, Figure 1 As shown, the measuring rod mechanism 1 includes: a measuring rod 11, a dust cover 12 and a measuring head 13; the measuring rod 11 passes through the front end side wall of the main shell 4 and the front end mechanism 7, the dust cover 12 is mounted on the part of the measuring rod 11 after passing through the front end mechanism 7, and the measuring rod 11 is installed at the end of the measuring rod 11 arranged outside the main shell 4.

[0032] The beneficial effects of adopting the above-mentioned preferred scheme are: the measuring rod is conducive to being pushed out under the action of the rebound force of the tension spring, so that the measuring probe at the end is in contact with the workpiece to be measured, and then the position measurement is achieved under the joint action of the sensor and the circuit board, and the dust cover is conducive to preventing the measuring rod outside the main shell from being contaminated by the external environment.

[0033] Preferably, Figure 1 As shown, the sliding mechanism 2 includes: two sliding rod seats 21, a sliding rod 22 and two sensors 23; the two sliding rod seats 21 are fixedly mounted on the measuring rod 11, and the two ends of the sliding rod 22 are connected to the side walls of the two sliding rod seats 21 in a one-to-one manner. The two sensors 23 are installed on the top ends of the two sliding rod seats 21 in a one-to-one manner, and the sensors 23 are connected to the circuit board 8.

[0034] It should be noted that, in a preferred embodiment of the present invention, the two sensors 23 are respectively a fine sensor with relatively high measurement accuracy and a coarse sensor with relatively low measurement accuracy.

[0035] The beneficial effects of adopting the above-mentioned preferred scheme are: the sliding rod seat is fixedly sleeved on the measuring rod, which is conducive to fixing the measuring rod mechanism and the sliding mechanism to form a whole, and then retracting or pushing out together under the pulling force of the cylinder mechanism and the rebound force of the tension spring; the sensor combined with the circuit board is conducive to realizing the measurement of displacement.

[0036] Preferably, Figure 1 As shown, one end of the tension spring 3 is fixedly connected to the front inner wall of the main housing 4, and the other end is fixedly connected to the slide rod seat 21 at the rear end.

[0037] The beneficial effect of adopting the above-mentioned preferred scheme is that when the cylinder mechanism is ventilated, the cylinder mechanism can be quickly separated from the slide rod seat by quickly pushing out the cylinder, and at the same time, the sliding mechanism and the measuring rod mechanism can be pushed out under the action of the rebound force of the tension spring, so that the measuring head can contact the object to be measured.

[0038] Preferably, Figure 2 and Figure 3 As shown, a cylinder push rod limit block 211 is provided on the side wall of the rear end slide rod seat 21, and a limit groove is provided on the top end of the cylinder push rod limit block 211 along the front-back direction, and the cylinder mechanism 5 is slidably set in the limit groove.

[0039] The beneficial effects of adopting the above-mentioned preferred scheme are: the sliding connection between the limit groove and the cylinder mechanism is conducive to the cylinder mechanism driving the sliding mechanism and the measuring rod mechanism to retreat to the rear end under the action of the spring rebound force inside the cylinder when the cylinder is not ventilated; when the cylinder is ventilated, the rapid push of the cylinder is utilized to cause the tension spring to apply a forward thrust to the sliding mechanism and the measuring rod mechanism.

[0040] Preferably, Figure 1 As shown, the cylinder mechanism 5 includes: a cylinder push rod 51, a sliding rod seat lifting cap 52 and a cylinder body; the cylinder body is installed on the rear end mechanism 6 and is connected to the cylinder push rod 51, the sliding rod seat lifting cap 52 is arranged at one end of the cylinder push rod 51 away from the cylinder body, the cylinder push rod 51 is arranged in the limiting groove, and the sliding rod seat lifting cap 52 is movably abutted against the cylinder push rod limiting block 211.

[0041] The beneficial effects of adopting the above-mentioned preferred scheme are: the introduction of power air source into the cylinder body is conducive to driving the cylinder push rod and the sliding rod seat lifting cap to be pushed out, and at the same time, the power air source only exists in the cylinder body and will not cause pollution to the measuring rod mechanism and sliding mechanism inside the main shell; when the cylinder body is not ventilated, the spring inside the cylinder body uses its rebound force to make the cylinder push rod and the sliding rod seat lifting cap retreat until the sliding rod seat lifting cap abuts against the side wall of the cylinder push rod limit block; when the cylinder body is ventilated, the cylinder body quickly drives the cylinder push rod and the sliding rod seat lifting cap to be pushed out, so that the sliding rod seat lifting cap is quickly separated from the side wall of the cylinder push rod limit block. At this time, the rebound force of the tension spring is applied to the sliding rod seat, driving the measuring rod mechanism and the sliding mechanism to be pushed forward until they contact the object to be measured.

[0042] Preferably, Figure 1As shown, the rear end mechanism 6 includes: a rear end sealing piece 61, a rear end cover plate 62 and an aviation socket 63; the rear end sealing piece 61 is arranged between the rear end outer wall of the main shell 4 and the rear end cover plate 62, the aviation socket 63 passes through the rear end cover plate 62 and the rear end sealing piece 61, and is installed at the rear end of the main shell 4, and the cylinder body passes through the rear end cover plate 62, the rear end sealing piece 61 and the rear end side wall of the main shell 4.

[0043] The beneficial effects of adopting the above preferred solution are: the rear end sealing sheet and the rear end cover plate are conducive to ensuring the rear end sealing and stability of the main shell, and the aviation socket is conducive to providing the necessary data line and power line connections for measurement.

[0044] Preferably, Figure 1 As shown, the front end mechanism 7 includes: a front end sealing sheet 71, a front end cover plate 72 and a steel sleeve 73; the steel sleeve 73 is a tubular structure passing through the front end sealing sheet 71, the front end cover plate 72 and the front end side wall of the main shell 4, and the measuring rod 11 passes through the steel sleeve 73.

[0045] The beneficial effects of adopting the above preferred solution are: the front sealing sheet and the front cover plate are conducive to ensuring the front sealing and stability of the main shell, and the steel sleeve is conducive to providing guidance for the displacement of the measuring rod when it is pushed out.

[0046] The working process of the utility model is introduced below:

[0047] like Figures 1 to 3 As shown, when the cylinder body is not ventilated, the spring inside the cylinder body uses its rebound force to retreat, pulling the cylinder push rod 51 and the sliding rod seat lifting cap 52 backward. At this time, the cylinder push rod 51 slides in the limit groove until the sliding rod seat lifting cap 52 abuts against the side wall of the cylinder push rod limit block 211 and then continues to retreat to the limit point. In this process, the sliding mechanism 2 and the measuring rod mechanism 1 are synchronously pulled backward, and the tension spring 3 is stretched;

[0048] When the cylinder body is ventilated, the cylinder body drives the cylinder push rod 51 and the sliding rod seat lifting cap 52 to be pushed forward. At this time, due to the large force of the cylinder body, the cylinder push rod 51 and the sliding rod seat lifting cap 52 will be pushed forward at a relatively fast speed. At this time, the tension spring 3 is no longer subjected to tension. Under the action of its rebound force, the sliding rod seat 21 is pushed forward, thereby causing the sliding mechanism 2 and the measuring rod mechanism 1 to be pushed forward synchronously. In this process, the measuring rod 11 drives the measuring head 13 to move forward until it contacts the object to be measured.

[0049] When the probe 13 contacts the object to be measured, an electrical signal is generated, which is transmitted to the sensor 23 and the circuit board 8. The displacement can be obtained through data calculation. The calculation here belongs to the existing technology and is not within the scope of protection of the present utility model, so it will not be described in detail.

[0050] During the above working process, the power air source is only in the cylinder body, and the power air source shares an inlet and exhaust port, and will not enter the inside of the main shell 4, so it will not cause pollution to the measuring rod mechanism 1 and the sliding mechanism 2 inside the main shell 4. At the same time, due to the rebound force of the tension spring 3 in the measuring state, the sliding mechanism 2 and the measuring rod mechanism 1 are pushed out, which avoids the unstable power air source from providing power for the pushing of the measuring rod mechanism 1, making the measurement safer, more stable and accurate.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation to the present invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A built-in cylinder displacement sensor, characterized in that: include: A measuring rod mechanism (1), a sliding mechanism (2), a tension spring (3), a main housing (4), a cylinder mechanism (5), a rear end mechanism (6), a front end mechanism (7), a circuit board (8) and a housing (9); The rear end mechanism (6) and the front end mechanism (7) are arranged at the rear end and the front end of the main housing (4) in a one-to-one correspondence; the measuring rod mechanism (1) is fixedly connected to the sliding mechanism (2); the measuring rod mechanism (1) can movably pass through the main housing (4) and the front end mechanism (7); the tension spring (3) and the sliding mechanism (2) are both arranged inside the main housing (4); one end of the tension spring (3) is fixedly connected to the inner wall of the main housing (4), and the other end is connected to the sliding mechanism (2); the circuit board (8) is installed in the main housing (4) and is connected to the sliding mechanism (2); the housing (9) is installed at the top end of the main housing (4); the cylinder mechanism (5) passes through the rear end mechanism (6) and the main housing (4) and is connected to the sliding mechanism (2).

2. A built-in cylinder displacement sensor according to claim 1, characterized in that: The measuring rod mechanism (1) comprises: a measuring rod (11), a dust cover (12) and a measuring head (13); the measuring rod (11) passes through the front end side wall of the main housing (4) and the front end mechanism (7); the dust cover (12) is sleeved on the portion of the measuring rod (11) after passing through the front end mechanism (7); and the measuring rod (11) is mounted on the end portion of the measuring rod (11) disposed outside the main housing (4).

3. A built-in cylinder displacement sensor according to claim 2, characterized in that: The sliding mechanism (2) comprises: two slide rod seats (21), a slide rod (22) and two sensors (23); the two slide rod seats (21) are fixedly sleeved on the measuring rod (11), the two ends of the slide rod (22) are connected to the side walls of the two slide rod seats (21) in a one-to-one correspondence, the two sensors (23) are installed on the top ends of the two slide rod seats (21) in a one-to-one correspondence, and the sensors (23) are connected to the circuit board (8).

4. A built-in cylinder displacement sensor according to claim 3, characterized in that: One end of the tension spring (3) is fixedly connected to the front inner wall of the main housing (4), and the other end is fixedly connected to the slide rod seat (21) at the rear end.

5. The built-in cylinder displacement sensor according to claim 3, characterized in that: A cylinder push rod limiting block (211) is provided on the side wall of the rear end slide rod seat (21), and a limiting groove is provided at the top end of the cylinder push rod limiting block (211) along the front-back direction, and the cylinder mechanism (5) is slidably provided in the limiting groove.

6. The built-in cylinder displacement sensor according to claim 5, characterized in that: The cylinder mechanism (5) includes: a cylinder push rod (51), a sliding rod seat lifting cap (52) and a cylinder body; the cylinder body is installed on the rear end mechanism (6) and connected to the cylinder push rod (51), the sliding rod seat lifting cap (52) is arranged at one end of the cylinder push rod (51) away from the cylinder body, the cylinder push rod (51) is arranged in the limiting groove, and the sliding rod seat lifting cap (52) is movably abutted against the cylinder push rod limiting block (211).

7. The built-in cylinder displacement sensor according to claim 6, characterized in that: The rear end mechanism (6) comprises: a rear end sealing sheet (61), a rear end cover plate (62) and an aviation socket (63); the rear end sealing sheet (61) is arranged between the rear end outer wall of the main housing (4) and the rear end cover plate (62); the aviation socket (63) passes through the rear end cover plate (62) and the rear end sealing sheet (61) and is installed at the rear end of the main housing (4); the cylinder body passes through the rear end cover plate (62), the rear end sealing sheet (61) and the rear end side wall of the main housing (4).

8. The built-in cylinder displacement sensor according to claim 2, characterized in that: The front end mechanism (7) comprises: a front end sealing sheet (71), a front end cover plate (72) and a steel sleeve (73); the steel sleeve (73) is a tubular structure passing through the front end sealing sheet (71), the front end cover plate (72) and the front end side wall of the main housing (4); the measuring rod (11) passes through the steel sleeve (73).

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