Electric cylinder with built-in pressure sensor

Abstract

The utility model provides an electric cylinder with a built-in pressure sensor. The electric cylinder comprises a driving piece, a cylinder barrel, a lead screw, a nut, a piston rod and the pressure sensor. The nut is sleeved outside the screw rod; the piston rod is sleeved outside the screw rod, the other end of the piston rod extends towards the outside of the cylinder barrel, and the pressure sensor is arranged at the other end of the piston rod; the piston rod is provided with a wire harness channel, a containing space is formed between the outer wall of the piston rod and the inner wall of the cylinder barrel, a wire outlet is formed in the side wall of the cylinder barrel, the containing space is communicated with the wire harness channel and the wire outlet, and a power line of the pressure sensor sequentially passes through the wire harness channel, the containing space and the wire outlet and then extends towards the outside of the cylinder barrel. The power line can be contained in the containing space and the wire harness channel, the situation that the power line is exposed out of the cylinder barrel disorderly is avoided, the situation that the power line is wound or knotted or abraded due to exposure is avoided, meanwhile, the pressure sensor is arranged at the other end of the piston rod, the pressure sensor is conveniently overhauled, and the maintenance difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric cylinder production technical field, specifically, it relates to a built-in pressure sensor's electric cylinder. BACKGROUND

[0002] The electric cylinder is a kind of device that the rotation of motor is converted into the linear motion of push rod through screw rod and screw pair, with the characteristics of high precision, high controllability and high positioning accuracy, it is usually composed of driving motor, speed reducer and linear transmission mechanism.

[0003] In order to realize high-precision output and ensure the stability and accuracy of electric cylinder in the whole movement process, it is particularly important to install pressure sensor on electric cylinder, most of which is to directly fix pressure sensor on the end of piston rod through adapter flange or screw, but this installation mode causes the power cord of pressure sensor to be exposed outside electric cylinder, not only affects the appearance, but also the power cord will move synchronously with the piston rod, and various situations such as winding, knotting or abrasion often occur. Nowadays, there are electric cylinders that set pressure sensor in cylinder barrel to achieve the purpose of power cord storage, for example, the electric cylinder built-in sensor structure disclosed in the announcement No. CN212231258U, although it achieves the purpose of power cord storage, but since the pressure sensor is located inside the cylinder barrel, when the pressure sensor needs to be maintained, the entire electric cylinder needs to be disassembled to take out the pressure sensor, which is difficult to maintain. SUMMARY

[0004] In view of the deficiencies of the prior art, the application provides an electric cylinder with built-in pressure sensor.

[0005] The electric cylinder with built-in pressure sensor disclosed in the application comprises a driving member, a cylinder barrel, a screw rod, a screw nut, a piston rod and a pressure sensor, the driving member is arranged at one end of the cylinder barrel, the screw rod is arranged in the cylinder barrel and connected with the driving end of the driving member, the screw nut is sleeved on the screw rod, the piston rod is sleeved on the screw rod, one end of the piston rod is connected with the screw nut, the other end of the piston rod extends towards the outside of the cylinder barrel, and the pressure sensor is arranged at the other end of the piston rod.

[0006] Preferably, the other end of the piston rod is provided with a mounting groove, the mounting groove is communicated with the wire harness channel, and the pressure sensor is arranged in the mounting groove.

[0007] Preferably, the pressure sensor comprises a sensor body, a connecting plug and a power line, the connecting plug is arranged at the groove bottom of the mounting groove, the sensor body is plugged into the connecting plug, one end of the power line is electrically connected with the connecting plug, and the other end of the power line extends to the outside of the cylinder barrel through the wire harness channel, the storage space and the wire outlet in sequence.

[0008] Preferably, the pressure sensor further comprises a plurality of fixing parts, the sensor body is provided with a plurality of mounting holes, the groove bottom of the mounting groove is provided with a plurality of positioning holes corresponding to the positions of the plurality of mounting holes, and the sensor body is detachably installed in the mounting groove through cooperation of the fixing parts, the mounting holes and the positioning holes.

[0009] Preferably, the electric cylinder with the built-in pressure sensor further comprises a telescopic device, the telescopic device is arranged at the outer sidewall of the cylinder barrel, and the power line outside the cylinder barrel is wound in the telescopic device.

[0010] Preferably, the power line is a spring power line.

[0011] Preferably, the inner wall of the cylinder barrel is provided with a fixing clamp, and the fixing clamp acts on the power line in the storage space.

[0012] Preferably, the electric cylinder with the built-in pressure sensor further comprises a magnetic scale reader and a magnetic scale, the magnetic scale is arranged on the outer wall of the piston rod along the axial direction of the piston rod, the sensing end surface of the magnetic scale reader faces the magnetic scale, and the magnetic scale reader is electrically connected with the driving part.

[0013] Preferably, the driving part comprises a driving motor and a shaft coupling, the driving motor is arranged at one end of the cylinder barrel, the driving shaft of the driving motor is connected with one end of the shaft coupling, and the other end of the shaft coupling is connected with the lead screw.

[0014] Preferably, the driving part further comprises an anti-collision ring, the anti-collision ring is sleeved on the lead screw, and the anti-collision ring is arranged between the shaft coupling and the nut.

[0015] The application has the beneficial effects that: through the arrangement of the storage space and the wire harness channel, the power line in the application can be accommodated in the storage space and the wire harness channel, so as to avoid the power line being exposed outside the cylinder barrel in disorder, thereby avoiding the power line being exposed to cause winding, knotting or abrasion, etc., prolonging the service life of the product, and at the same time, since the pressure sensor is arranged at the other end of the piston rod, i.e. outside the cylinder barrel, when the pressure sensor fails, the entire electric cylinder does not need to be disassembled for maintenance, thereby reducing the maintenance difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0017] Figure 1Structure diagram of the electric cylinder with built-in pressure sensor in Example 1;

[0018] Figure 2 For Figure 1 Enlarged view of part A in Example 1;

[0019] Figure 3 Another structure diagram of the electric cylinder with built-in pressure sensor in Example 1;

[0020] Figure 4 Top view of the mounting groove in Example 1;

[0021] Figure 5 Top view of the sensor body in Example 1.

[0022] Reference signs:

[0023] 1, drive member; 11, drive motor; 12, coupling; 13, anti-collision ring; 14, motor base; 15, bearing seat; 2, cylinder barrel; 21, receiving space; 3, screw rod; 4, nut; 5, piston rod; 51, wire harness passage; 52, mounting groove; 521, positioning hole; 6, pressure sensor; 61, sensor body; 611, mounting hole; 62, connecting plug; 63, power cord; 64, fixed part; 7, telescopic device; 8, magnetic scale reader. DETAILED DESCRIPTION

[0024] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.

[0025] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description and does not mean to specially indicate the order or sequence, nor to limit the present application, which is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0027] In order to further understand the application content, characteristics and effects of the present application, the following examples are given, and the details are described as follows with reference to the accompanying drawings.

[0028] Example one:

[0029] Referring to Figures 1-3 , Figure 1 is a structural schematic diagram of the electric cylinder with built-in pressure sensor in example one, Figure 2 is Figure 1 an enlarged view of part A in Figure 3 is another structural schematic diagram of the electric cylinder with built-in pressure sensor in example one, the electric cylinder with built-in pressure sensor in the embodiment includes a driving member 1, a cylinder barrel 2, a lead screw 3, a lead nut 4, a piston rod 5 and a pressure sensor 6, the driving member 1 is arranged at one end of the cylinder barrel 2. The lead screw 3 is arranged in the cylinder barrel 2 and connected with the driving end of the driving member 1. The lead nut 4 is sleeved outside the lead screw 3. The piston rod 5 is sleeved outside the lead screw 3, one end of the piston rod 5 is connected to the lead nut 4, the other end of the piston rod 5 extends towards the outside of the cylinder barrel 2, and the pressure sensor 6 is arranged at the other end of the piston rod 5. The piston rod 5 is provided with a wire harness channel 51, and the outer wall of the piston rod 5 and the inner wall of the cylinder barrel 2 have a receiving space 21, the side wall of the cylinder barrel 2 is provided with a wire outlet, and the receiving space 21 is in communication with the wire harness channel 51 and the wire outlet respectively, and the power line 63 of the pressure sensor 6 extends to the outside of the cylinder barrel 2 after passing through the wire harness channel 51, the receiving space 21 and the wire outlet in sequence.

[0030] Through the arrangement of the receiving space 21 and the wire harness channel 51, the power line 63 in the embodiment can be accommodated in the receiving space 21 and the wire harness channel 51, and will not be exposed disorderly outside the cylinder barrel 2, avoiding the exposure of the power line 63 leading to winding, knotting or abrasion, etc., prolonging the service life of the product, at the same time, since the pressure sensor 6 is arranged at the other end of the piston rod 5, i.e. outside the cylinder barrel 2, when the pressure sensor 6 fails, it does not need to disassemble the whole electric cylinder for maintenance, reducing the difficulty of maintenance.

[0031] Reference is made to Figure 1 , preferably, the driving member 1 comprises a driving motor 11 and a coupling 12, the driving motor 11 is arranged at one end of the cylinder barrel 2, the driving shaft of the driving motor 11 is connected with one end of the coupling 12, and the other end of the coupling 12 is connected with the lead screw 3. In specific application, the driving motor 11 is installed at one end of the cylinder barrel 2 through a motor base 14, the driving shaft of the driving motor 11 is connected with one end of the coupling 12 after penetrating through the motor base 14, and the other end of the coupling 12 is connected with the lead screw 3, so that the driving motor 11 drives the lead screw 3 to rotate through the coupling 12, the rotation of the lead screw 3 drives the nut 4 to move linearly along the axial direction of the lead screw 3, and the linear movement of the nut 4 drives the piston rod 5 to move linearly along the axial direction of the cylinder barrel 2, that is, the other end of the piston rod 5 moves linearly to approach or away from the cylinder barrel 2. Specifically, the coupling 12 is sleeved with a bearing seat 15, and the nut 4 is a ball nut, which is prior art and will not be described here. Further, the driving member 1 further comprises an anti-collision ring 13, the anti-collision ring 13 is sleeved outside the lead screw 3, and the anti-collision ring 13 is arranged between the coupling 12 and the nut 4. Through the arrangement of the anti-collision ring 13, the collision between the nut 4 and the coupling 12 or the bearing seat 15 during the linear movement of the nut 4 can be avoided, the failure rate is reduced, and the service life of the product is prolonged.

[0032] Reference is made to Figure 4 , Figure 4 is a top view of the installation slot in Example 1, preferably, the other end of the piston rod 5 is provided with an installation slot 52, the installation slot 52 is communicated with the wire harness channel 51, and the pressure sensor 6 is arranged in the installation slot 52. Through the arrangement of the installation slot 52, the pressure sensor 6 can be installed inside the installation slot 52, only a small part of the volume is exposed outside the other end of the piston rod 5, the length of the piston rod 5 is reduced, and miniaturization is realized. At the same time, the channel opening of the wire harness channel 51 is arranged at the slot bottom of the installation slot 52, when the pressure sensor 6 is installed in the installation slot 52, the power line 63 can be wired from the wire harness channel 51 whose channel opening is at the slot bottom of the installation slot 52, that is, one end of the wire harness channel 51 is communicated with the installation slot 52, and the opening of the other end of the wire harness channel 51 is arranged at the side wall of the piston rod 5 and is communicated with the storage space 21, and then most of the power line 63 is stored in the wire harness channel 51 and the storage space 21, so that the exposure of the power line 63 outside the cylinder barrel is avoided, and the winding, knotting or abrasion of the power line 63 is avoided. The storage space 21 is arranged along the axial direction of the cylinder barrel 2, that is, one end of the storage space 21 is close to the other end of the cylinder barrel 2, and the other end of the storage space 21 extends toward one end of the cylinder barrel 2. It needs to be particularly pointed out that the side wall of the cylinder barrel 2 at the position close to the coupling 12 is provided with a wire outlet, the power line 63 penetrates out of the wire outlet to extend outside the cylinder barrel 2 and is connected with external power supply, so as to supply power to the pressure sensor 6.

[0033] Reference is made to Figure 5 , Figure 5For the top view of the sensor body in Embodiment One, preferably, the pressure sensor 6 comprises a sensor body 61, a connecting plug 62 and a power cord 63, the connecting plug 62 is arranged at the groove bottom of the mounting groove 52, the sensor body 61 is plugged into the connecting plug 62, one end of the power cord 63 is electrically connected with the connecting plug 62, and the other end of the power cord 63 extends to the outside of the cylinder barrel 2 through the wire harness channel 51, the storage space 21 and the wire outlet in turn. In specific application, the pressure sensor 6 in this embodiment is a detachable plug-in pressure sensor, wherein the connecting plug 62 is arranged at the groove bottom of the mounting groove 52 and at the channel opening of the wire harness channel 51, when the sensor body 61 is plugged into the connecting plug 62, the sensor body 61 can obtain power supply from the external commercial power supply through the connecting plug 62 and the power cord 63, and when the sensor body 61 needs to be replaced or repaired due to damage, the sensor body 61 can be taken out for repair by being pulled out of the connecting plug 62, without the need to disassemble the connecting plug 62 and the power cord 63 together, thereby improving the convenience of repair and saving repair time.

[0034] Referring back to Figure 2 , preferably, the pressure sensor 6 further comprises a plurality of fixing parts 64, the sensor body 61 is provided with a plurality of mounting holes 611, the groove bottom of the mounting groove 52 is provided with a plurality of positioning holes 521 corresponding to the positions of the plurality of mounting holes 611, and the sensor body 61 can be detachably installed in the mounting groove 52 through the cooperation of the fixing parts 64, the mounting holes 611 and the positioning holes 521. In specific application, the fixing parts 64 are fixing screws, when the sensor body 61 is plugged into the connecting plug 62, i.e., when the sensor body 61 is installed in the mounting groove 52, the fixing parts 64 can be used to pass through the mounting holes 611 and the positioning holes 521, so as to fix and connect the sensor body 61 in the mounting groove 52 at the other end of the piston rod 5, thereby improving the stability of the installation of the pressure sensor 6. Specifically, the plurality of mounting holes 611 are annularly arranged in the sensor body 61, and the plurality of mounting holes 611 and the plurality of positioning holes 521 are respectively and correspondingly arranged.

[0035] Referring back to Figure 1, preferably, the electric cylinder with built-in pressure sensor further comprises an extender 7, which is arranged on the outer wall of the cylinder barrel 2, and the power line 63 outside the cylinder barrel 2 is wound in the extender 7. In specific application, since the sensor body 61 is fixedly arranged at the other end of the piston rod 5, when the piston rod 5 moves linearly, the sensor body 61 also moves linearly synchronously, so that the power line 63 is constantly pulled. Through the arrangement of the extender 7, the power line 63 outside the cylinder barrel 2 can be wound in the extender 7. It can be understood that when the pressure sensor 6 needs to be connected to the mains, the other end of the power line 63 can be pulled out of the extender 7 and connected to the mains, and at this time, a large amount of power line 63 is still wound in the extender 7. When the piston rod 5 drives the sensor body 61 to move away from the cylinder barrel 2, the sensor body 61 will pull the power line 63, so that the power line 63 wound in the extender 7 is pulled into the inside of the cylinder barrel 2, so that the connection between the power line 63 and the mains is not pulled, avoiding power failure. When the piston rod 5 drives the sensor body 61 to move towards the cylinder barrel 2, part of the power line 63 in the cylinder barrel 2 is wound into the extender 7, that is, part of the power line 63 is buffered in the extender 7, avoiding the disconnection of the power line 63 from the mains due to the synchronous movement of the sensor body 61 with the piston rod 5, and improving the stability of the work. Specifically, the structure of the extender 7 in the embodiment is similar to that of the data line extender in the prior art, which will not be described in detail here.

[0036] Referring back to Figure 1 , preferably, the electric cylinder with built-in pressure sensor further comprises a magnetic scale reader 8 and a magnetic scale, the magnetic scale is arranged on the outer wall of the piston rod 5 along the axial direction of the piston rod 5, the sensing end surface of the magnetic scale reader 8 is opposite to the magnetic scale, and the magnetic scale reader 8 is electrically connected with the driving part 1. Through the arrangement of the magnetic scale reader 8 and the magnetic scale, the electric cylinder with built-in pressure sensor in the embodiment can also read the magnetic field signal on the magnetic scale through the magnetic scale reader 8, so as to accurately obtain the position information of the linear movement of the piston rod 5, improve the movement precision of the piston rod 5, and further improve the movement precision of the piston rod 5 under the joint action of the pressure sensor 6. Specifically, the working principle of the magnetic scale reader 8 and the magnetic scale can refer to the electric cylinder with built-in magnetic scale disclosed in CN212811480U, which will not be described here.

[0037] Embodiment two:

[0038] The electric cylinder with the built-in pressure sensor in the embodiment is different from the electric cylinder in the first embodiment in that the electric cylinder in the embodiment does not have the telescopic device 7, and the power line 63 in the embodiment is a spring power line. When the sensor body 61 moves away from the cylinder barrel 2 in synchronization with the piston rod 5 and pulls the power line 63, the power line 63 is straightened and its length is increased due to the elasticity of the power line 63, so that the power line 63 is not disconnected from the mains. When the sensor body 61 moves towards the cylinder barrel 2 in synchronization with the piston rod 5, the power line 63 returns to its original shape. Specifically, the inner wall of the cylinder barrel 2 is provided with a fixing clamp that acts on the power line 63 in the receiving space 21. It can be understood that the fixing clamp can clamp the middle part of the power line 63, which means that the power line 63 can be divided into two parts at this time. One part of the power line 63 is straightened or restored with the movement of the sensor body 61, and the other part of the power line 63 is connected to the mains and does not change its shape. That is, the other part of the power line 63 is not pulled by the sensor body 61 due to the fixing clamp, so that the power line 63 is not disconnected from the mains, and the stability and safety are improved.

[0039] In summary, the power line 63 in the embodiment can be accommodated in the receiving space 21 and the wire harness channel 51 due to the provision of the receiving space 21 and the wire harness channel 51, so that the power line 63 is not exposed to the outside of the cylinder barrel 2 in disorder, so as to avoid the exposure of the power line 63 to cause winding, knotting or abrasion, etc., and prolong the service life of the product. At the same time, since the pressure sensor 6 is arranged at the other end of the piston rod 5, i.e., outside the cylinder barrel 2, when the pressure sensor 6 fails, the entire electric cylinder does not need to be disassembled for maintenance, so that the maintenance difficulty is reduced.

[0040] The above is only an embodiment of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. An electric cylinder with a built-in pressure sensor, characterized by, The utility model relates to a kind of cylinder, which includes drive (1), cylinder barrel (2), screw rod (3), nut (4), piston rod (5) and pressure sensor (6), the drive (1) is located in one end of the cylinder barrel (2);The screw rod (3) is located in the cylinder barrel (2) and is connected with the drive end of the drive (1);The nut (4) is sleeved on the screw rod (3) outside;The piston rod (5) is sleeved on the screw rod (3) outside, and one end of the piston rod (5) is connected to the nut (4), the other end of the piston rod (5) extends towards the outside of the cylinder barrel (2), and the pressure sensor (6) is located at the other end of the piston rod (5);The piston rod (5) is provided with wire harness channel (51), and the piston rod (5) has receiving space (21) between outer wall and the inner wall of the cylinder barrel (2), and the side wall of the cylinder barrel (2) is provided with wire outlet, and the receiving space (21) is communicated with the wire harness channel (51) and the wire outlet respectively, and the power line (63) of the pressure sensor (6) extends towards the outside of the cylinder barrel (2) after passing through the wire harness channel (51), the receiving space (21) and the wire outlet in sequence. The other end of the piston rod (5) is provided with mounting groove (52), the mounting groove (52) is communicated with the wire harness channel (51), and the pressure sensor (6) is arranged in the mounting groove (52).

2. The electric cylinder with a built-in pressure sensor according to claim 1, characterized by, The pressure sensor (6) includes sensor main body (61), connecting plug (62) and power line (63), the connecting plug (62) is arranged at the groove bottom of the mounting groove (52), the sensor main body (61) is inserted into the connecting plug (62), one end of the power line (63) is electrically connected with the connecting plug (62), and the other end of the power line (63) extends towards the outside of the cylinder barrel (2) after passing through the wire harness channel (51), the receiving space (21) and the wire outlet in sequence.

3. The electro-hydraulic cylinder with a built-in pressure sensor according to claim 2, characterized in that The pressure sensor (6) further includes a plurality of fixing parts (64), the sensor main body (61) is provided with a plurality of mounting holes (611), the groove bottom of the mounting groove (52) is provided with a plurality of positioning holes (521) corresponding to the positions of the plurality of mounting holes (611), and the sensor main body (61) can be detachably installed in the mounting groove (52) through the cooperation of the fixing parts (64), the mounting holes (611) and the positioning holes (521).

4. The electro-hydraulic cylinder with a built-in pressure sensor according to claim 3, characterized in that It further includes telescopic device (7), and the telescopic device (7) is arranged on the outer side wall of the cylinder barrel (2), and the power line (63) outside the cylinder barrel (2) is wound in the telescopic device (7).

5. The electric cylinder with a built-in pressure sensor according to claim 1, characterized by, The power line (63) is a spring power line.

6. The electric cylinder with a built-in pressure sensor according to claim 1, characterized by, The inner wall of the cylinder barrel (2) is provided with a fixing clamp, and the fixing clamp acts on the power line (63) in the receiving space (21).

7. The electro-hydraulic cylinder with a built-in pressure sensor according to claim 6, characterized in that ​ 8. The pressure sensor in-lieu electric cylinder according to claim 1, wherein, It also includes a magnetic grid ruler reading head (8) and a magnetic grid ruler, the magnetic grid ruler is arranged on the outer wall of the piston rod (5) along the axis direction of the piston rod (5), the sensing end surface of the magnetic grid ruler reading head (8) is opposite to the magnetic grid ruler, and the magnetic grid ruler reading head (8) is electrically connected with the driving member (1).

9. The electric cylinder with a built-in pressure sensor according to claim 1, characterized by, The driving member (1) includes a driving motor (11) and a shaft coupling (12), the driving motor (11) is arranged at one end of the cylinder barrel (2), the driving shaft of the driving motor (11) is connected with one end of the shaft coupling (12), and the other end of the shaft coupling (12) is connected with the lead screw (3).

10. The electric cylinder with a built-in pressure sensor according to claim 9, characterized by The driving member (1) further includes an anti-collision ring (13), the anti-collision ring (13) is sleeved outside the lead screw (3), and the anti-collision ring (13) is arranged between the shaft coupling (12) and the nut (4).

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