Elastic sealing type air cylinder of integrated pull rod type linear displacement sensing unit

Abstract

An elastic sealing type air cylinder of an integrated pull rod type linear displacement sensing unit comprises a cylinder barrel, a piston rod, a pull rod type linear displacement sensor static module and a pull rod type linear displacement sensor movable module, and the piston rod divides the inner space of the cylinder barrel into a rod cavity and a rodless cavity. The pull rod type linear displacement sensor static module comprises a sensor shell, a signal processing circuit board, a circuit board A and a circuit board B; the sensor shell is fixedly connected with the inner side of the cylinder rear end cover and is partially arranged in the piston rod; the signal processing circuit board is arranged in the cylinder rear end cover; the circuit board A and the circuit board B are fixed in the sensor shell; the pull rod type linear displacement sensor dynamic module comprises a pull rod and a sliding block electric brush assembly. The pull rod is connected with the piston rod and positioned in the sensor shell; the sliding block electric brush assembly comprises a sliding sleeve and an electric brush, the sliding sleeve is fixed at the tail end of the pull rod, and the electric brush is fixed on the sliding sleeve and is in sliding electric contact with the circuit board A and the circuit board B. The device is high in integration degree, accurate and reliable in detection and convenient to maintain.

Description

Technical Field

[0001] This invention relates to the field of pneumatic actuator technology, and in particular to an elastically sealed cylinder with an integrated rod-type linear displacement sensing unit. Background Technology

[0002] In fields such as automated production, mechanical equipment, and intelligent manufacturing, cylinders, as core pneumatic actuators, are widely used in linear drive scenarios due to their advantages of rapid response, compact structure, and controllable cost. With the continuous improvement of precision requirements in industrial automation, real-time and accurate detection of the displacement of the cylinder piston rod is directly related to the equipment's motion accuracy, repeatability, and operational stability.

[0003] While various solutions for cylinder displacement detection have been developed, they still fall short of meeting the high precision, stability, and long lifespan requirements of modern industry. External solutions using independent sensing units such as optical scales, magnetic scales, and Hall effect sensors require mounting to the outside of the cylinder, which not only occupies additional installation space and limits equipment layout flexibility but is also susceptible to environmental dust, vibration, and impacts, leading to signal drift or damage to the sensing elements. For example, Chinese invention patent CN119641747A discloses a telescopic bar with a displacement sensor, dividing the telescopic cylinder into multiple stages and installing displacement sensors on the outside of each stage. This separate measurement method reduces the space occupied by individual long sensors, and the use of knobs, threaded rods, and clamps replaces traditional bolt fixation for improved ease of assembly and disassembly. However, the sensors still suffer from inherent defects such as susceptibility to environmental interference and incompatibility with the cylinder sealing system, as well as messy cable routing and the risk of connection failures. Therefore, a highly integrated, accurate, reliable, and easy-to-maintain built-in displacement sensing cylinder is needed. Summary of the Invention

[0004] Existing cylinder displacement detection methods mostly employ external, independent sensing solutions, which suffer from problems such as occupying installation space, susceptibility to environmental interference from dust, vibration, and collisions leading to signal drift or component damage, incompatibility with the cylinder sealing system, messy cables prone to connection failures, and inconvenient maintenance. These issues make it difficult to meet the modern industrial demands for high precision, high stability, and long lifespan in cylinders. To address these problems, this invention proposes an elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit. The technical solution used is as follows: A resiliently sealed cylinder integrating a rod-type linear displacement sensing unit includes a cylinder barrel, a piston rod, and a rod-type linear displacement sensor module. The cylinder barrel has a front end cap and a rear end cap at both ends. The piston rod is slidably mounted inside the cylinder barrel, dividing the internal space into a rod chamber and a rodless chamber. The front end cap has a vent hole for the rod chamber communicating with the rod chamber, and the rear end cap has a vent hole for the rodless chamber communicating with the rodless chamber. The rod-type linear displacement sensor module includes a static module and a dynamic module. The static module of the pull rod type linear displacement sensor includes a sensor housing, a signal processing circuit board, circuit board A, and circuit board B; the sensor housing is fixedly connected to the inside of the cylinder rear end cover and is partially disposed inside the piston rod; the signal processing circuit board is disposed inside the cylinder rear end cover; circuit board A and circuit board B are fixed inside the sensor housing; The pull rod type linear displacement sensor moving module includes a pull rod and a sliding block brush assembly; the pull rod is connected to the piston rod and located inside the sensor housing; the sliding block brush assembly includes a sliding sleeve and a brush, the sliding sleeve is fixed to the end of the pull rod, the brush is fixed on the sliding sleeve, and forms sliding electrical contact with circuit board A and circuit board B.

[0005] Furthermore, the rear end of the pull rod is provided with an installation rod; the installation rod is coaxial with the pull rod and its diameter is smaller than that of the pull rod; the sliding sleeve is fitted onto the installation rod, and the rear end of the pull rod fits into the interior of the sliding sleeve; the rear end of the installation rod is threaded and fitted with a fixing nut, and a spring fitted onto the installation rod is provided between the sliding block brush assembly and the fixing nut, with one side of the spring abutting against the end of the sliding block brush assembly and the other side abutting against the fixing nut.

[0006] Furthermore, a resistive film is provided on the inner surface of the circuit board A, and conductive electrodes A and B are respectively connected to the two ends of the resistive film. Conductive electrode A is electrically connected to the positive lead through solder joint A, and conductive electrode B is electrically connected to the negative lead through solder joint B. A conductive slider is provided on the inner surface of the circuit board B, and a conductive electrode C is connected to one end of the conductive slider. Conductive electrode C is electrically connected to the signal output line through solder joint C. The brush forms sliding electrical contact with both the resistive film and the conductive slider. The positive lead, negative lead, and signal output line are respectively connected to the signal processing circuit board.

[0007] Furthermore, a guide groove is provided inside the sensor housing, and the sliding sleeve is embedded in the guide groove.

[0008] Furthermore, a first mounting slot and a second mounting slot are provided inside the sensor housing, and the circuit board A and the circuit board B are respectively fixed in the second mounting slot and the first mounting slot.

[0009] Furthermore, the signal processing circuit board includes a power supply module and a signal processing core module; the power supply module is used to supply power to the rod-type linear displacement sensor module and the signal processing core module; the signal processing core module integrates a two-stage filtering circuit, an MCU, a memory chip, and a signal conditioning module containing an adaptive gain amplifier; the MCU has a built-in ADC; the signal output terminal of the rod-type linear displacement sensor module is connected to the input terminal of the signal conditioning module, the output terminal of the signal conditioning module is connected to the input terminal of the two-stage filtering circuit, the output terminal of the two-stage filtering circuit is connected to the ADC input terminal of the MCU, the communication interface of the MCU is connected to the communication terminal of the memory chip, and the control terminal of the MCU is connected to the enable terminal of the signal conditioning module, thereby controlling the signal acquisition timing through MCU programming.

[0010] Furthermore, the piston rod has a piston rod cavity inside, and a threaded rod is threadedly installed at the front end of the piston rod. A vent hole communicating with the piston rod cavity is opened in the threaded rod.

[0011] Furthermore, the pull rod and the threaded rod are connected by a ball joint.

[0012] Furthermore, the piston rod has a piston rod end cap at its rear end, and a sealing ring C is provided on the contact surface between the piston rod end cap and the sensor housing.

[0013] Furthermore, a signal processing circuit board protective end cover is detachably installed on the cylinder rear end cover; the cylinder rear end cover or the signal processing circuit board protective end cover is provided with a signal processing circuit wiring hole.

[0014] Because the present invention adopts the above-described technical solution, the present invention has the following advantages: 1. This invention embeds the rod-type linear displacement sensor module inside the piston rod, and the signal processing circuit is fixed to the cavity of the cylinder's rear end cover. All cables are integrated and led out through a single through hole. Compared with the external solution, this significantly reduces the installation space occupied and optimizes the flexibility of equipment layout. Each core component adopts a detachable structure with threaded connections. The sensor housing and the rear end cover, the piston rod end cover and the piston rod are all threaded. The disassembly and assembly process does not require disassembling the entire cylinder, which significantly reduces maintenance difficulty and time consumption. The modular structure design simplifies the installation and debugging process and avoids connection failures caused by messy cables, adapting to the development needs of miniaturization and integration of industrial equipment.

[0015] 2. This invention addresses the structural design issues of sealing between the rodless chamber of the cylinder and the piston rod, as well as the air pressure balance during piston rod movement. Specifically, an elastic sealing element is installed at the contact surface between the piston rod end cap and the sensor housing. The sealing element fully fills the gap between the two surfaces using the clamping action of the threaded tightening structure, thereby achieving efficient sealing between the rodless chamber of the cylinder and the piston rod, effectively avoiding problems such as decreased drive efficiency and sensor damage caused by air pressure leakage. Simultaneously, a vent is opened at the front end of the piston rod or threaded rod to ensure air pressure balance within the piston rod during movement. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the elastically sealed cylinder with integrated tie rod linear displacement sensing unit according to the present invention.

[0017] Figure 2 This is a partial cross-sectional structural diagram of the moving module of the rod-type linear displacement sensor of the present invention.

[0018] Figure 3 This is a schematic diagram of the installation of the moving module of the rod-type linear displacement sensor of the present invention.

[0019] Figure 4 This is a schematic diagram showing the installation of the sliding block brush assembly and the sensor housing of the present invention.

[0020] Figure 5 This is a cross-sectional installation diagram of the static module and the rear end cover of the rod-type linear displacement sensor of the present invention.

[0021] Figure 6 This is a schematic diagram showing the connection between circuit board A, circuit board B and signal processing circuit board of the present invention.

[0022] Figure 7 This is a basic schematic diagram of the signal processing circuit board of the present invention.

[0023] Icon labels: 1-Piston rod; 11-Piston rod vent; 12-Sealing ring A; 13-Sealing ring B; 14-Ball head; 15-Threaded rod; 16-Piston rod end cap; 17-Sealing ring C; 2-Cylinder front end cap; 21-Rod chamber vent; 3-Cylinder barrel; 4-Pulse module of pull rod type linear displacement sensor; 41-Pulse rod; 42-Sliding block brush assembly; 421-Sliding sleeve; 422-Brush; 43-Mounting rod; 44-Fixing nut; 45-Metal sheet A; 46-Spring; 47-Metal sheet B; 5-Static module of pull rod type linear displacement sensor; 51-Sensor housing; 511-First mounting groove; 512-Guide groove; 513-Second mounting groove; 52-Circuit board A; 521-Resistor film; 522-Pin solder joint A; 523-Positive lead; 524-Negative lead; 525-Pin solder joint B; 526-Conductive electrode A; 527-Conductive electrode B; 53-Circuit board B; 531-Conductive slider; 532-Conductive electrode C; 533-Signal output line; 534-Pin solder joint C; 54-Signal processing circuit board; 541-Power supply module; 542-Signal processing core module; 5421-Signal conditioning module; 5422-Secondary filter circuit; 5423-MCU; 5424-Memory chip; 6-Cylinder rear end cover; 61-Rodless chamber vent; 62-Signal processing circuit wiring hole; 63-Signal processing circuit wiring hole; 64-Signal processing circuit board protective end cover; 65-Anti-loosening screw; 66-Sealing ring D. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; however, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of this invention, it should be noted that the terms "upper", "lower", "in", "out", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Example:

[0026] An elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit, such as Figure 1As shown, it includes a cylinder 3, a piston rod 1, and a rod-type linear displacement sensor module. The cylinder is provided with a cylinder front end cover 2 and a cylinder rear end cover 6 at both ends. The piston rod 1 is slidably installed inside the cylinder 3 and divides the internal space of the cylinder 3 into a rod chamber and a rodless chamber. The cylinder front end cover 2 is provided with a rod chamber vent 21 that communicates with the rod chamber, and the cylinder rear end cover 6 is provided with a rodless chamber vent 61 that communicates with the rodless chamber. like Figures 2-5 As shown, the rod-type linear displacement sensor module includes a static rod-type linear displacement sensor module 5 and a dynamic rod-type linear displacement sensor module 4. The static rod-type linear displacement sensor module 5 includes a sensor housing 51, a signal processing circuit board 54, circuit board A52, and circuit board B53. The sensor housing 51 is fixedly connected to the inside of the cylinder rear end cover 6 and is partially disposed inside the piston rod 1. The signal processing circuit board 54 is disposed inside the cylinder rear end cover 6, and circuit boards A52 and B53 are fixed inside the sensor housing 51. The dynamic rod-type linear displacement sensor module 4 includes a rod 41 and a sliding block brush assembly 42. The rod 41 is connected to the piston rod 1 and located inside the sensor housing 51. The sliding block brush assembly 42 is fixed to the end of the rod 41 and contacts circuit boards A52 and B53 through the brush 422.

[0027] like Figures 2-4 As shown, the pull rod 41 is made of stainless steel, and the rear end is integrally formed with a mounting rod 43. The mounting rod 43 is coaxially arranged with the pull rod 41, and its diameter is smaller than that of the pull rod 41. The two form a stepped surface for positioning the sliding block brush assembly 42. The sliding block brush assembly 42 includes a sliding sleeve 421 and a brush 422. The internal diameter of the sliding sleeve 421 is adapted to the mounting rod 43 and the pull rod 41. The sliding sleeve 421 is fitted into the mounting rod 43, so that the inside of the sliding sleeve 421 fits against the stepped surface of the pull rod 41. The brush 422 is fixed to the sliding sleeve 421 with screws, and the two contacts of the brush 422 maintain stable and reliable sliding electrical contact with circuit board A52 and circuit board B53, respectively.

[0028] like Figures 5-6 As shown, the sensor housing 51 is made of aluminum alloy with external threads machined on the outside to match the internal threads on the inner side of the cylinder rear end cover 6. The inner wall of the sensor housing 51 has a first mounting groove 511 and a second mounting groove 513 that are symmetrically formed along the axial direction. Circuit boards A52 and B53 are respectively embedded in the second mounting groove 513 and the first mounting groove 511 and are fixed with epoxy glue to ensure that circuit boards A52 and B53 are relatively fixed to the sensor housing 51.

[0029] The signal processing circuit board 54 is sized to fit the cavity of the cylinder rear end cover 6 and is fixed inside the cavity of the cylinder rear end cover 6 by two anti-loosening screws 65. A gap is reserved between the signal processing circuit board 54 and the inner wall of the cylinder rear end cover 6 cavity for heat dissipation. A protective end cover 64 for the signal processing circuit board is detachably installed on the cylinder rear end cover 6. A wiring hole 62 for the signal processing circuit is opened on the cylinder rear end cover 6 or the protective end cover 64 for the signal processing circuit. Figure 5 (Taking the opening of the signal processing circuit wiring hole 62 in the cylinder rear end cover 6 as an example for explanation) A waterproof connector is installed in the signal processing circuit wiring hole 62. All power input, signal output and control cables are integrated and passed through the waterproof connector to connect to the signal processing circuit board 54, and sealed with a sealing ring D66 to avoid cable mess and improve sealing and dustproof performance.

[0030] like Figure 6 As shown, a resistive film 521 is provided on the inner surface of circuit board A52. The resistive film 521 is made of thick-film resistive paste and its length is adapted to the axial length of sensor housing 51. Conductive electrodes A526 and B527 are respectively connected to the two ends of the resistive film 521. Conductive electrode A526 is electrically connected to the positive lead 523 through lead solder joint A522, and conductive electrode B527 is electrically connected to the negative lead 524 through lead solder joint B525. A conductive slider 531 is provided on the inner surface of circuit board B53. One end of the conductive slider 531 is connected to a conductive electrode C. 532, the conductive electrode C532 is electrically connected to the signal output line 533 through the pin solder joint C534; the brush 422 is arranged between the circuit board A52 and the circuit board B53, and slides synchronously with the moving module 4 of the follow-up rod type linear displacement sensor, while maintaining reliable contact with the resistive film 521 and the conductive slider 531, and leading out the electrical signal of the corresponding displacement position on the resistive film 521 through the conductive slider 531; the positive lead 523, the negative lead 524 and the signal output line 533 are respectively connected to the signal processing circuit board 54 to realize the acquisition, processing and output of the detection signal.

[0031] A signal processing circuit through hole 63 is opened on the cylinder rear end cover 6. The positive lead 523 and negative lead 524 at the end of the circuit board A52 and the signal output line 533 at the end of the circuit board B53 are integrated and passed through the signal processing circuit through hole 63. The hole is then sealed with glue and electrically connected to the power supply module 541 and the signal processing core module 542 of the signal processing circuit board 54 in the cavity of the cylinder rear end cover 6, respectively.

[0032] like Figures 2-4As shown, the brush 422 can adopt an elastic metal sheet contact structure; a metal sheet B47, a disc-shaped spring 46, a metal sheet A45 are sequentially inserted into the rear end of the mounting rod 43, and finally the fixing nut 44 is screwed in. The disc-shaped spring 46 generates a continuous axial preload under the compressed state, which is transmitted to the sliding block brush assembly 42 through the metal sheet B47, ensuring that the brush 422 maintains stable contact with the resistive film 521 and the conductive slider 531 at all times, avoiding poor contact due to vibration; the inner wall of the sensor housing 51 is provided with a guide groove 512 along the axial direction, and the protrusion of the sliding sleeve 421 of the sliding block brush assembly 42 is embedded in the guide groove 512, so that the sliding block brush assembly 42 can only slide along the axial direction of the guide groove 512, avoiding the contact deviation of the brush 422 with the resistive film 521 and the conductive slider 531 caused by the deflection of the sliding block brush assembly 42.

[0033] like Figure 7 As shown, the signal processing circuit board 54 includes a power supply module 541 and a signal processing core module 542.

[0034] The power supply module 541 includes an external power interface and a voltage regulator and filter unit, providing stable power to the rod-type linear displacement sensor module and the signal processing core module 542. The signal processing core module 542 integrates a two-stage filter circuit 5422, an MCU 5423, a memory chip 5424, and a signal conditioning module 5421 containing an adaptive gain amplifier. The MCU 5423 has a built-in ADC. The signal output terminal of the rod-type linear displacement sensor module is connected to the input terminal of the signal conditioning module 5421 (circuit board A52 and brush 42). 2. Circuit board B53 works in conjunction with the circuit board to convert the piston rod displacement into an analog voltage signal. The signal conditioning module 5421 acquires the analog voltage signal. The output of the signal conditioning module 5421 is connected to the input of the secondary filter circuit 5422. The output of the secondary filter circuit 5422 is connected to the ADC input of the MCU 5423. The interface of the MCU 5423 is connected to the communication terminal of the memory chip 5424. The control terminal of the MCU 5423 is connected to the enable terminal of the signal conditioning module 5421. The signal acquisition timing can be controlled by programming the MCU.

[0035] All solder joints must be reinforced by welding, cable connections must be insulated with heat shrink tubing, and power and signal output interfaces on the circuit board must use waterproof plugs to ensure reliability in industrial environments.

[0036] like Figure 1 As shown, the piston rod 1 has a piston rod cavity inside, and a threaded rod 15 is threadedly installed at the front end of the piston rod 1. A vent hole 11 communicating with the piston rod cavity is opened in the threaded rod 15 along the axial direction. This structure can balance the air pressure difference between the inside and outside of the piston rod 1 when it reciprocates, and avoid the increase of motion resistance due to air pressure imbalance.

[0037] The pull rod 41 and the threaded rod 15 are connected by a ball head 14. The rear end of the ball head 14 is machined with an external thread to match the threaded hole at the front end of the pull rod 1; the front end of the ball head 14 is embedded in the spherical groove of the threaded rod 15. After assembly, the ball head 14 can swing within a certain range within the threaded rod 15, effectively offsetting the slight coaxial deviation during the movement of the piston rod 1, and avoiding damage to the sliding block brush assembly 42 by the lateral force generated by the rigid connection.

[0038] A piston rod end cap 16 is provided at the rear end of the piston rod 1. The piston rod end cap 16 has external threads machined on its exterior to match the threaded hole at the rear end of the piston rod 1. An annular sealing groove is formed on the contact surface between the piston rod 1 and the sensor housing 51, and a sealing ring C17 is embedded therein. When the piston rod end cap 16 is screwed clockwise into the threaded hole at the rear end of the piston rod 1, the sealing ring C17 is pressed tightly by the contact surface between the piston rod end cap 16 and the sensor housing 51 during the screwing process, completely filling the mating gap and achieving a seal for compressed air in the rodless chamber of the cylinder 3. This prevents air pressure leakage from affecting the cylinder's driving efficiency or damaging the sensor module. Sealing rings A12 and B13 are provided between the piston of the piston rod 1 and the cylinder 3 to seal the rod chamber and the rodless chamber, respectively.

Claims

1. A resiliently sealed cylinder with an integrated tie-rod type linear displacement sensing unit, characterized in that, The system includes a cylinder (3), a piston rod (1), and a rod-type linear displacement sensor module. The cylinder (3) has a cylinder front end cover (2) and a cylinder rear end cover (6) at both ends. The piston rod (1) is slidably installed inside the cylinder (3) and divides the internal space of the cylinder (3) into a rod chamber and a rodless chamber. The cylinder front end cover (2) has a rod chamber vent hole (21) communicating with the rod chamber, and the cylinder rear end cover (6) has a rodless chamber vent hole (61) communicating with the rodless chamber. The rod-type linear displacement sensor module includes a rod-type linear displacement sensor static module (5) and a rod-type linear displacement sensor dynamic module (4). The static module (5) of the pull rod type linear displacement sensor includes a sensor housing (51), a signal processing circuit board (54), a circuit board A (52), and a circuit board B (53); the sensor housing (51) is fixedly connected to the inner side of the cylinder rear end cover (6) and is partially disposed inside the piston rod (1); the signal processing circuit board (54) is disposed inside the cylinder rear end cover (6); the circuit board A (52) and the circuit board B (53) are fixed inside the sensor housing (51); The lever-type linear displacement sensor moving module (4) includes a lever (41) and a sliding block brush assembly (42); the lever (41) is connected to the piston rod (1) and located inside the sensor housing (51); the sliding block brush assembly (42) includes a sliding sleeve (421) and a brush (422), the sliding sleeve (421) is fixed to the end of the lever (41), the brush (422) is fixed on the sliding sleeve (421), and forms sliding electrical contact with circuit board A (52) and circuit board B (53).

2. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The pull rod (41) has an installation rod (43) at its rear end; the installation rod (43) is coaxial with the pull rod (41) and its diameter is smaller than that of the pull rod (41); the sliding sleeve (421) is fitted on the installation rod (43), and the rear end of the pull rod (41) is in close contact with the inside of the sliding sleeve (421); the rear end of the installation rod (43) is threaded and fitted with a fixing nut (44); a spring (46) is provided between the sliding block brush assembly (42) and the fixing nut (44) and is fitted on the installation rod (43); one side of the spring (46) abuts against the end of the sliding block brush assembly (42), and the other side abuts against the fixing nut (44).

3. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The inner surface of circuit board A (52) is provided with a resistive film (521). The two ends of the resistive film (521) are respectively connected to conductive electrodes A (526) and B (527). Conductive electrode A (526) is electrically connected to the positive lead (523) via solder joint A (522), and conductive electrode B (527) is electrically connected to the negative lead (524) via solder joint B (525). The inner surface of circuit board B (53) is provided with a resistive film (521). The conductive slider (531) has a conductive electrode C (532) connected to one end. The conductive electrode C (532) is electrically connected to the signal output line (533) through the pin solder point C (534). The brush (422) forms a sliding electrical contact with both the resistive film (521) and the conductive slider (531). The positive lead (523), negative lead (524) and signal output line (533) are respectively connected to the signal processing circuit board (54).

4. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The sensor housing (51) is provided with a guide groove (512), and the sliding sleeve (421) is embedded in the guide groove.

5. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The sensor housing (51) is provided with a first mounting groove (511) and a second mounting groove (513), and the circuit board A (52) and the circuit board B (53) are respectively fixed in the second mounting groove (513) and the first mounting groove (511).

6. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The signal processing circuit board (54) includes a power supply module (541) and a signal processing core module (542); the power supply module (541) is used to supply power to the rod-type linear displacement sensor module and the signal processing core module (542); the signal processing core module (542) integrates a two-stage filter circuit (5422), an MCU (5423), a memory chip (5424), and a signal conditioning module (5421) containing an adaptive gain amplifier; the MCU (5423) has a built-in ADC; the rod-type linear displacement sensor module (5424) has a built-in ADC; the signal processing core module (5424) integrates a two-stage filter circuit (5422), an MCU (5423), a memory chip (5424), and a signal conditioning module (5421) containing an adaptive gain amplifier ...) integrates a two-stage filter circuit (5422), an MCU (5423), and a signal processing core module (542). The signal output terminal of the sensor module is connected to the input terminal of the signal conditioning module (5421). The output terminal of the signal conditioning module (5421) is connected to the input terminal of the secondary filter circuit (5422). The output terminal of the secondary filter circuit (5422) is connected to the ADC input terminal of the MCU (5423). The communication interface of the MCU (5423) is connected to the communication terminal of the memory chip (5424). The control terminal of the MCU (5423) is connected to the enable terminal of the signal conditioning module (5421). The signal acquisition timing is controlled by programming the MCU (5423).

7. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The piston rod (1) has a piston rod cavity inside, and a threaded rod (15) is threadedly installed at the front end of the piston rod (1). A vent hole (11) communicating with the piston rod cavity is opened in the threaded rod (15).

8. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 7, characterized in that, The pull rod (41) and the threaded rod (15) are connected by a ball head (14).

9. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The piston rod (1) is provided with a piston rod end cap (16) at its rear end, and a sealing ring C (17) is provided between the piston rod end cap (16) and the sensor housing (51) contact surface.

10. The elastically sealed cylinder with an integrated tie-rod type linear displacement sensing unit according to claim 1, characterized in that, The cylinder rear end cover (6) is detachably mounted with a signal processing circuit board protection end cover (64); the cylinder rear end cover (6) or the signal processing circuit board protection end cover (64) is provided with a signal processing circuit wiring hole (62).

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