Displacement sensor for electric drive pump-controlled cylinder, and adaptive oil cylinder and displacement detection method

Abstract

The utility model discloses a displacement sensor for electric drive pump control cylinder and adaptive oil cylinder and displacement detection method, including drive arrangement and displacement sensing mechanism, drive arrangement includes motor and drive rod, and drive rod end is fixedly connected with motor output shaft and can rotate with motor synchronization, and drive rod circumferential surface sets up axial limit device, and displacement sensing mechanism includes measuring rod, electronic warehouse, rotary limit ring and magnetic induction block, and drive rod sets up installation groove on the axial, and sets up the cavity in drive rod, and the cavity sets up in close to motor one side and another end intercommunication installation groove, measuring rod is inserted in the axial installation groove of drive rod, and electronic warehouse sets up in the cavity one in drive rod on, and measuring rod one end is connected with electronic warehouse, and drive rod is set up rotary limit ring, and the inner ring one side of rotary limit ring is fixedly set up magnetic induction block, drive rod still sets up conducting mechanism, and when drive shaft rotates, and conducting mechanism guarantees that signal and power supply are uninterrupted transmission under the condition that drive shaft rotates.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic component technology, specifically a displacement sensor for electrically driven pump cylinder control, an adapted cylinder, and a displacement detection method. Background Technology

[0002] In industrial engineering, traditional linear displacement driven hydraulic cylinders serve as actuators that convert hydraulic energy into linear motion mechanical energy. Currently, existing electro-hydraulic linear drive cylinders include a cylinder body and a guide sleeve. A piston and piston rod are housed within the cylinder body, forming a rod cavity between the cylinder body, piston rod, and guide sleeve. A rodless cavity is formed between the other end of the piston and the cylinder body. A drive device is located at one end of the rodless cavity. A drive rod is housed within the cylinder body, and a cavity is provided within the piston rod. The drive rod is fixedly mounted at the end of the output shaft of the drive rod device, extending through the piston and into the piston rod cavity. Inside, the drive rod has axially extending key teeth on its radial circumferential surface. The piston has a cavity for mounting the oil delivery mechanism. The piston also has an oil passage for connecting the oil delivery mechanism, the rod chamber, and the rodless chamber. The oil delivery mechanism has a meshing hole with a keyway on its inner wall. The key teeth on the radial circumferential surface of the drive rod can mesh with the keyway on the inner side of the meshing hole. The key on the drive rod drives the oil delivery mechanism inside the piston. Rotating the drive rod drives the oil delivery mechanism to transport oil back and forth between the rod chamber and the rodless chamber, thereby controlling the extension and retraction of the piston rod.

[0003] A axial drive capability is achieved by rotating a splined rod driven by a motor, which then transmits hydraulic power through an oil delivery mechanism within the piston. This hydraulic system requires no external oil circuitry. The identical working cross-sections of the rod and rodless chambers ensure that the oil provides the same displacement distance to both chambers during delivery, but the exact displacement amount cannot be determined. Traditional displacement sensing mechanisms are not suitable for this type of cylinder. To improve cylinder performance, the displacement sensing mechanism must be externally located outside the cylinder body. When the sensor is isolated from the system, its anti-interference and anti-contamination capabilities are compromised, and the entire system is not truly integrated. Summary of the Invention

[0004] This invention provides a displacement sensor for electrically driven pump cylinder control, an adapted hydraulic cylinder, and a displacement detection method.

[0005] A displacement sensing mechanism for an electrically driven pump cylinder includes a drive unit and a displacement sensing mechanism. The drive unit includes a motor and a drive rod. The end of the drive rod is fixedly connected to the output shaft of the motor and can rotate synchronously with the motor. Several axial key teeth are provided on the circumferential surface of the drive rod. The displacement sensing mechanism includes a measuring rod, an electronic chamber, a rotation limiting ring, and a magnetic induction block. An axial mounting groove is provided on the drive rod. A cavity is provided inside the drive rod, located near the motor and connected to the mounting groove at the other end. The measuring rod is inserted into the axial mounting groove of the drive rod. The electronic chamber is located inside the cavity. One end of the measuring rod is connected to the electronic chamber. A rotation limiting ring is sleeved on the drive rod. The rotation limiting ring includes an inner ring, an outer ring, and a ball. The ball is located between the inner ring and the outer ring. A magnetic induction block is provided on the inner ring. The edge of the outer ring is fixedly connected to the piston. A conductive mechanism is sleeved on the outside of the cavity of the electronic chamber.

[0006] Furthermore, the conductive mechanism includes a support ring, a conductive ring, and a brush assembly. The brush assembly is sleeved on the drive rod and can rotate synchronously with the drive rod. A conductive ring is set outside the brush assembly to transmit current. A support ring is sleeved outside the conductive ring. A bottom ring is set at the bottom of the support ring, which can fix the relative position of the conductive ring and the support ring.

[0007] Furthermore, the front end of the electronic compartment is fixedly connected to a measuring rod, and the rear end is connected to the brush assembly and data transmission line via a circuit.

[0008] Furthermore, the drive rod is a spline rod, with the mounting groove located between the two keyways, and a spline groove adapted to the drive rod is located in the middle of the inner ring of the rotation limit ring.

[0009] Furthermore, the measuring rod is cylindrical and is inserted into a mounting slot on the drive rod. The mounting slot is semi-circular, and the axial edge of the measuring rod is partially exposed after it is inserted.

[0010] Furthermore, the magnetic induction block is fan-shaped and protruding, and is located at the edge of the inner ring of the rotating limiting ring. The inner side of the magnetic induction block always remains close to the axial exposed surface of the measuring rod. When the inner ring of the rotating limiting ring rotates synchronously with the driving rod, it can maintain a stable sensing distance with the measuring rod.

[0011] An electrically driven pump-controlled cylinder includes a cylinder body, a piston and a piston rod fixedly connected to the piston inside the cylinder body, a guide sleeve at the cylinder head, an oil port at the cylinder bottom, the piston rod extending out of the cylinder body through the guide sleeve, a cylindrical body sleeved outside the cylinder body, the end of the piston rod fixedly connected to the bottom of the cylindrical body, an oil delivery mechanism inside the piston, an integrated drive sensor for the electrically driven pump cylinder, a motor located outside the cylinder bottom, a drive rod passing through the piston to drive the oil delivery mechanism, a rotation limit ring fixedly mounted on the piston, and an annular support seat at the cylinder bottom, the annular support seat being coaxial with the cylinder bottom and having a through hole in the middle, a conductive mechanism being installed inside the through hole.

[0012] Furthermore, the width of the through hole in the middle of the annular support is greater than the total length of the conductive mechanism and the rotation limiting ring, and an oil inlet groove is provided on the side wall of the annular support corresponding to the oil port.

[0013] A method for detecting the stroke displacement of an electrically driven pump-controlled cylinder includes an electrically driven pump-controlled cylinder with an integrated drive sensor inside. Oil is filled into the cylinder through an oil port and an oil inlet groove on one side of an annular support until the working requirements are met, after which the oil port is closed. At this time, the cylinder does not need to be connected to an external oil tank. The motor of the drive device rotates, driving the drive rod to rotate, thereby driving the oil delivery mechanism inside the piston. The inlet and outlet of the oil delivery mechanism are connected to the rod chamber and the rodless chamber, respectively. When the piston rod needs to extend, oil enters the rodless chamber from the rod chamber, at which point the piston rod extends. During the extension process, the displacement sensing mechanism is always running. When the piston drives the magnetic induction block to move axially... The displacement is transmitted to the electronic chamber via the sensing rod, and the electrical signal is transmitted to the external control device via the conductive mechanism. When the piston rod needs to retract, the motor of the drive device rotates in the reverse direction, driving the drive rod to rotate in the reverse direction, thereby driving the hydraulic conveying mechanism inside the piston to operate. Oil flows from the rodless chamber to the rod chamber. At this time, the piston rod retracts, and the magnetic induction block transmits the displacement to the electronic chamber via the sensing rod, and the electrical signal is transmitted to the external control device via the conductive mechanism. During the operation of the hydraulic cylinder, the magnetic induction block of the displacement sensing mechanism is fixedly connected to the piston via the rotating limit ring and moves synchronously with the piston. The main body of the electric slip ring is fixed on the bottom of the cylinder.

[0014] The beneficial effects of this invention are as follows: By combining a conductive mechanism with a displacement sensing mechanism, a solution is found for precise position measurement in rotating equipment. This high-precision measurement is unaffected by rotation. When the drive shaft rotates, the conductive mechanism allows uninterrupted transmission of signals and power even as the drive shaft rotates indefinitely. This avoids the use of easily tangled and worn drag chain cables on rotating parts and can transmit various types of output signals. Integrating the conductive mechanism and displacement sensing mechanism into the electro-hydraulic cylinder can completely solve the problem of displacement measurement under rotating conditions. By combining the displacement sensing mechanism with the electro-hydraulic cylinder, the overall system of the hydraulic cylinder is enhanced in terms of oil resistance, high pressure resistance, and lifespan. It can still output signals stably under vibration and electromagnetic interference environments. This not only eliminates the risk of breakage of traditional drag chain cables, but also eliminates redundant conversion mechanisms, directly providing accurate displacement feedback to the controller, and greatly improving the operating accuracy of the hydraulic cylinder and the reliability of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3This is a schematic diagram of the overall structure of the drive rod of the present invention; Figure 4 This is a schematic diagram of the cross-section of the drive rod of the present invention; Figure 5 This is a schematic diagram of the combined structure of the rotating limiting ring, magnetic induction block and driving rod of the present invention; Figure 6 yes Figure 5 Enlarged structural diagram at point B; Figure 7 This is a front view of the magnetic sensing block and rotating limiting ring structure of the present invention; Figure 8 This is a schematic cross-sectional view of the overall structure of the hydraulic cylinder adapted to this invention.

[0016] in: 1-Drive device, 11-Motor, 12-Drive rod, 13-Cavity 1, 14-Mounting slot, 2-Displacement sensing mechanism, 21-Measuring rod, 22-Electronic chamber, 23-Rotation limit ring, 24-Magnetic induction block, 231-Inner ring, 232-Outer ring, 233-Ball bearing 3-Conductive mechanism, 31-Support ring, 32-Conductive ring, 33-Brush assembly, 34-Bottom ring, 4-Cylinder block, 5-Piston, 51-Oil delivery mechanism 6-Piston rod, 7-Guide sleeve, 8-Cylinder body 9- Annular support seat, 91- Oil inlet groove. Detailed Implementation

[0017] like Figure 1-5As shown, a displacement sensing mechanism for an electrically driven pump cylinder includes a drive unit 1 and a displacement sensing mechanism 2. The drive unit 1 includes a motor 11 and a drive rod 12. The end of the drive rod 12 is connected to the output shaft of the motor 11 and can be driven to rotate by the motor 11. The drive end of the drive rod 12 is a splined shaft. The displacement sensing mechanism 2 includes a measuring rod 21, an electronic chamber 22, a rotation limit ring 23, and a magnetic induction block 24. An axial mounting groove 14 is provided on the drive rod 12. The mounting groove 14 is a semi-circular channel for mounting... The groove 14 is provided between the roots of the key teeth of the splines on the drive rod 12. A cavity 13 is provided inside the drive rod 12 near the motor 11. The electronic compartment 22 of the displacement sensing mechanism 2 is provided inside the cavity 13. The measuring rod 21 is embedded in the axial mounting groove 14 of the drive rod 12. One end of the measuring rod 21 is connected to the electronic compartment 22. A rotation limiting ring 23 is sleeved on the drive rod 12. The rotation limiting ring 23 includes an inner ring 231 and an outer ring 232. Several rollers are arranged between the inner ring 231 and the outer ring 232. The inner ring 231 of the rotating limiting ring 23 has internal teeth adapted to the spline shaft of the drive rod 12. A magnetic induction block 24 is fixedly installed on the edge of the inner ring 231. The inner arc surface of the magnetic induction block 24 corresponds to and is adjacent to the measuring rod. The outer ring 232 is fixed on the piston in the cylinder, which can drive the entire rotating limiting ring 23 to move synchronously with the piston. A conductive mechanism 3 is installed on the outer side of the cavity 13. The conductive mechanism 3 includes a support ring 31, a conductive ring 32, a brush assembly 33 and a bottom ring 34. 3 is fixed to the drive rod 12 and can rotate synchronously with the drive rod 12. The brush assembly 33 is provided with a conductive ring 32 and a support ring 31 on the outside. A bottom ring 34 is provided between the support ring 31 and the conductive ring 32. The bottom ring 34 is fixed to the bottom of the cylinder and restricts the relative position of the support ring 31 and the conductive ring 32. The support ring 31 and the conductive ring 32 do not rotate synchronously with the drive rod 12 when the drive rod 12 rotates. The front end of the electronic compartment 22 is fixedly connected to the measuring rod 21, and the rear end is connected to the conductive ring 32 through a circuit and a data transmission line.

[0018] like Figures 3 to 5 As shown, the mounting groove 14 is located between the two keyways of the drive rod 12. A rotation limiting ring 23 is provided on the drive rod 12, and the magnetic induction block 24 is fan-shaped. The measuring rod 21 is rod-shaped and is embedded in the mounting groove 14 opened on the drive rod 12. After the measuring rod 21 is installed, its axial edge is partially exposed. After the measuring rod 21 and the rotation limiting ring 23 are installed, the inner arc surface of the magnetic induction block 24 is close to the axial exposed surface of the measuring rod 21. When the inner ring of the rotation limiting ring 23 rotates synchronously with the drive rod 12, it can maintain a stable sensing distance with the measuring rod 21.

[0019] In actual measurement use, the measuring rod 21 is embedded in the mounting groove 14 opened on the drive rod 12. The relative distance between the magnetic induction block 24 on the inner ring of the rotation limit ring 23 and the measuring rod 21 remains unchanged during the rotation of the drive rod 12 and can follow the piston 5 to move along the axial direction of the drive rod 12. The measuring rod 21 can accurately detect the position of the magnetic induction block 24 during its movement and record and transmit displacement data through the electronic compartment 22. The conductive mechanism 3 continuously supplies power throughout the process.

[0020] like Figure 8 As shown, an electrically driven pump-controlled cylinder includes a cylinder body 4, a piston 5 and a piston rod 6 fixedly connected to the piston 5 inside the cylinder body 4, a guide sleeve 7 at the cylinder head of the cylinder body 4, an oil port at the bottom of the cylinder, the piston rod 6 extending out of the cylinder body 4 through the guide sleeve 7, a cylindrical body 8 sleeved outside the cylinder body 4, the end of the piston rod 6 fixedly connected to the bottom of the cylindrical body 8, an oil delivery mechanism 51 inside the piston 5, a motor 11 located outside the bottom of the cylinder body 4, the output shaft of the motor 11 connected to a drive rod 12, the drive rod 12 passing through the piston 5 to drive the oil delivery mechanism 51; the inner ring 231 of the rotation limit ring 23 has internal teeth adapted to the spline shaft of the drive rod 12, a magnetic induction block 24 fixedly installed on the edge, and an outer ring 232 fixedly installed on the piston 5. A ball bearing 233 is provided between the inner ring 231 and the outer ring 232. During the rotation of the drive rod 12, the outer ring 232 drives the rotation limiting ring 23 to move synchronously with the piston 5. The inner ring of the rotation limiting ring 23 is sleeved on the drive rod 12 and can rotate synchronously with the drive rod 12. An annular support seat 9 is provided at the bottom of the cylinder body 4. The annular support seat 9 is coaxial with the cylinder bottom and has a through hole in the middle. A conductive mechanism 3 is provided in the through hole. The bottom ring 34 of the conductive mechanism 3 is fixed to the edge of the through hole on the inner side of the cylinder bottom of the cylinder body 4. The bottom ring 34 restricts the relative position of the support ring 31 and the guide ring 32. The depth of the through hole in the middle of the annular support seat 9 is greater than the total length of the conductive mechanism 3 and the rotation limiting ring 23. An oil inlet groove 91 is provided on the side wall of the annular support seat 9 at the oil port.

[0021] In use, the motor 11 of the drive device 1 rotates, driving the drive rod 12 to rotate, thereby driving the oil delivery mechanism 51 inside the piston 5 to operate. The inlet and outlet oil passages of the oil delivery mechanism 51 are connected to the rod chamber and the rodless chamber, respectively. When the piston rod 6 needs to extend, the oil enters the rodless chamber from the rod chamber, and the piston rod 6 extends. During the extension process, the displacement sensing mechanism 2 is always running. When the piston 5 drives the magnetic induction block 24 to move axially, the displacement is transmitted to the electronic compartment 22 through the sensing of the measuring rod 21. The signal is transmitted to the external control device through the conductive mechanism 3. When the piston rod 6 needs to retract, the motor 11 of the drive device 1 rotates in the opposite direction, driving the drive rod 12 to rotate in the opposite direction, thereby driving the hydraulic conveying mechanism inside the piston 5 to operate. The oil flows from the rodless chamber into the rod chamber. At this time, the piston rod 6 retracts. The magnetic induction block 24 transmits the displacement to the electronic compartment 22 through the sensing of the measuring rod 21. The electrical signal is transmitted to the external display device through the conductive mechanism 3. During the operation of the hydraulic cylinder, the magnetic induction block 24 of the displacement sensing mechanism 2 is fixedly connected to the piston 5 through the rotating limit ring and moves synchronously with the piston 5. The main body of the conductive mechanism 3 is fixed on the bottom of the cylinder.

Claims

1. A displacement sensor for an electrically driven pump cylinder, comprising a drive device (1) and a displacement sensing mechanism (2), wherein the drive device (1) comprises a motor (11) and a drive rod (12), the end of the drive rod (12) is fixedly connected to the output shaft of the motor (11) and can rotate synchronously with the motor (11), and a plurality of axial key teeth are provided on the circumferential surface of the drive rod (12), and the displacement sensing mechanism (2) comprises a measuring rod (21), an electronic chamber (22), a rotation limiting ring (23), and a magnetic induction block (24), characterized in that: An axial mounting groove is provided on the drive rod (12), and a cavity (13) is provided inside the drive rod (12). The cavity (13) is located on the side close to the motor (11) and the other end is connected to the mounting groove (14). The measuring rod (21) is inserted into the axial mounting groove (14) of the drive rod (12). The electronic compartment (22) is located inside the cavity (13). One end of the measuring rod (21) is connected to the electronic compartment (22). A rotation limiting ring (23) is sleeved on the drive rod (12). The rotation limiting ring (23) includes an inner ring (231), an outer ring (232), and a ball (233). The ball (233) is located between the inner ring (231) and the outer ring (232). A magnetic induction block (24) is provided on the inner ring (231), and the edge of the outer ring (232) is fixedly connected to the piston (5). A conductive mechanism (3) is sleeved on the outside of the cavity of the electronic compartment (22). The conductive mechanism (3) includes a support ring (31), a conductive ring (32), and a brush assembly (33). The brush assembly (33) is sleeved on the drive rod (12) and can rotate synchronously with the drive rod (12). The conductive ring (32) is provided outside the brush assembly (33) to transmit current. The support ring (31) is sleeved outside the conductive ring (32). The bottom ring (34) is provided at the bottom of the support ring (31). The bottom ring (34) can fix the relative position of the conductive ring (32) and the support ring (31). The front end of the electronic compartment (22) is fixedly connected to the measuring rod (21), and the rear end is connected to the brush assembly (33) via a circuit and a data transmission line.

2. The displacement sensor for an electrically driven pump cylinder as described in claim 1, characterized in that: The drive rod (12) is a spline rod, the mounting groove (14) is set between the two keyways, and the inner ring (231) of the rotation limiting ring (23) is provided with a spline groove that is compatible with the drive rod (12).

3. The displacement sensor for electric pump cylinder control as described in claim 2, characterized in that: The measuring rod (21) is cylindrical and is inserted into the mounting groove (14) opened on the drive rod (12). The mounting groove (14) is semi-circular, and the axial edge of the measuring rod (21) is partially exposed after it is inserted.

4. The displacement sensor for electric pump cylinder control as described in claim 3, characterized in that: The magnetic sensing block (24) is fan-shaped and is located at the edge of the inner ring (231) of the rotating limiting ring (23). The inner side of the magnetic sensing block (24) is always close to the axial exposed surface of the measuring rod (21). When the inner ring (231) of the rotating limiting ring (23) rotates synchronously with the driving rod (12), it can maintain a stable sensing distance with the measuring rod (21).

5. An electrically driven pump-controlled cylinder, comprising a cylinder body (4), a piston (5) and a piston rod (6) fixedly connected to the piston (5) are disposed inside the cylinder body (4), a guide sleeve (7) is disposed at the cylinder head of the cylinder body (4), an oil port is disposed at the bottom of the cylinder, the piston rod (6) extends out of the cylinder body (4) through the guide sleeve (7), a cylinder body (8) is sleeved outside the cylinder body (4), the end of the piston rod (6) is fixedly connected to the bottom of the cylinder body (8), and an oil delivery mechanism (51) is disposed inside the piston (5), characterized in that: The displacement sensor for the electric pump control cylinder as described in claim 4 is provided, wherein the motor (11) is located on the outside of the cylinder bottom of the cylinder body (4), the drive rod (12) passes through the piston (5) and drives the oil delivery mechanism (51) to run, the rotation limit ring (23) is fixedly located on the piston (5), and an annular support seat (9) is provided at the bottom of the cylinder body (4). The annular support seat (9) is coaxial with the cylinder bottom and has a through hole in the middle. A conductive mechanism (3) is provided in the through hole.

6. The electrically driven pump control cylinder as described in claim 5, characterized in that: The width of the through hole in the middle of the annular support (9) is greater than the total length of the conductive mechanism (3) and the rotating limiting ring (23). An oil inlet groove (91) is provided on the side wall of the annular support (9) at the oil port.

7. A method for detecting the stroke displacement of an electrically driven pump cylinder, characterized in that: Including the electric pump control cylinder as described in claim 5, oil is filled into the cylinder body (4) through the oil port and the oil inlet groove (91) on one side of the annular support (9) until the working requirements are met, and then the oil port is closed. At this time, the cylinder body (4) does not need to be connected to an external oil tank. The motor (11) of the drive device (1) rotates, driving the drive rod (12) to rotate, thereby driving the oil delivery mechanism in the piston (5) to run. The oil delivery mechanism's inlet and outlet are connected to the rod chamber and the rodless chamber, respectively. When the piston rod (6) needs to extend, the oil enters the rodless chamber from the rod chamber. At this time, the piston rod (6) extends. During the extension process, the displacement sensing mechanism (2) always runs. When the piston (5) drives the magnetic induction block (24) to move axially, the displacement is transmitted to the electronic sensor through the sensing of the measuring rod (21). In the chamber (22), the electrical signal is transmitted to the external control device through the conductive mechanism (3); when the piston rod (6) needs to retract, the motor (11) of the drive device (1) rotates in the opposite direction, driving the drive rod (12) to rotate in the opposite direction, thereby driving the hydraulic conveying mechanism in the piston (5) to run, and the oil enters the rod chamber from the rodless chamber. At this time, the piston rod (6) retracts, and the magnetic induction block (24) transmits the displacement to the electronic chamber (22) through the sensing of the measuring rod (21), and transmits the electrical signal to the external control device through the conductive mechanism (3); during the operation of the hydraulic cylinder, the magnetic induction block (24) of the displacement sensing mechanism (2) is fixedly connected to the piston (5) through the rotating limit ring and moves synchronously with the piston (5). The main body of the conductive mechanism (3) is fixed on the bottom of the cylinder.

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