Direct drive servo cylinder

Abstract

The utility model discloses a direct drive type servo electric cylinder, including cylinder, the bottom inboard installation linear spline cover of cylinder, the top of cylinder and motor installation lower flange between installation tension and pressure sensor, and the other end of motor installation lower flane is connected with motor installation flange, and motor installation flange is connected with direct drive hollow motor, screw rod passes through direct drive hollow motor and linear spline cover, and the rotatory ball screw nut is arranged between linear spline cover and direct drive hollow motor, and the output end of direct drive hollow motor installs motor output shaft, and the end of motor output shaft installs rotatory nut input shaft, and rotatory nut input shaft is connected with the rotary part of rotatory ball screw nut, and the fixed part of rotatory ball screw nut is connected with the inner ring of tension and pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of electric technology, specifically to a direct-drive servo electric cylinder. Background Technology

[0002] In existing technologies, traditional servo electric cylinders typically employ a transmission method where a motor drives a lead screw via a reducer. This transmission method has several drawbacks: firstly, the introduction of the reducer increases the complexity of the mechanical structure, resulting in a larger equipment size and making it difficult to meet the requirements of installation in confined spaces; secondly, the reducer has low transmission efficiency, generating significant mechanical losses during energy transfer and affecting the overall performance of the equipment. Furthermore, the sensors in traditional servo electric cylinders are mostly mounted externally, making them susceptible to vibrations and impacts from the worktable, leading to inaccurate measurement data and hindering the achievement of high-precision pressure control. Utility Model Content

[0003] This invention provides a direct-drive servo electric cylinder, which reduces the impact of worktable vibration on the sensor and minimizes the impact of unbalanced jitter during high-speed rotation on the tension and compression sensors.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A direct-drive servo electric cylinder includes a cylinder barrel. A linear spline sleeve is installed on the inner side of the bottom of the cylinder barrel. A tension / compression sensor is installed between the top of the cylinder barrel and the lower flange of the motor mounting. The other end of the lower flange of the motor mounting is connected to the motor mounting flange. The motor mounting flange is connected to a direct-drive hollow motor. A lead screw passes through the direct-drive hollow motor and the linear spline sleeve. A rotary ball screw nut is provided between the linear spline sleeve and the direct-drive hollow motor. A motor output shaft is installed at the output end of the direct-drive hollow motor. A rotary nut input shaft is installed at the end of the motor output shaft. The rotary nut input shaft is connected to the rotating part of the rotary ball screw nut. The fixed part of the rotary ball screw nut is connected to the inner ring of the tension / compression sensor.

[0006] Preferably, the rotating part of the rotary nut input shaft and the rotary ball screw nut is connected by several bolts, and the rotary nut input shaft and the motor output shaft are connected by a flat key.

[0007] Preferably, the motor output shaft is provided with a rotating nut input shaft mounting hole, the motor output shaft is provided with a stepped surface, the end of the rotating nut input shaft is located at the stepped surface of the motor output shaft, the outer side of the rotating nut input shaft is provided with a plurality of flat key mounting slots I, the motor output shaft is provided with a plurality of flat key mounting slots II, the flat key mounting slots I and II correspond to each other, and flat keys are installed at the flat key mounting slots I and II.

[0008] Preferably, the cylinder has three inner cavities connected in sequence: inner cavity one, inner cavity two, and inner cavity three. The diameters of inner cavity one, inner cavity two, and inner cavity three gradually increase. A straight spline sleeve passes through inner cavity one, and a rotating ball screw nut is located in inner cavity two and inner cavity three.

[0009] Preferably, the straight spline sleeve includes a first connecting sleeve and a second connecting sleeve. The outer diameter of the first connecting sleeve is smaller than the outer diameter of the second connecting sleeve. The first connecting sleeve is located inside the first inner cavity, and the second connecting sleeve is located in the second inner cavity. The second connecting sleeve is connected to the cylinder.

[0010] Preferably, the cylinder barrel is made of aluminum.

[0011] Preferably, the tension / compression sensor is a spoke-type tension / compression sensor.

[0012] Preferably, there are two parallel keys, which are arranged symmetrically.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The improved heat dissipation performance of the motor in this invention greatly meets the requirements of high-frequency, high-speed, and full-load operation. The structure of this invention also reduces the overall weight of the equipment.

[0015] The direct-drive hollow motor directly drives the rotating ball screw nut, eliminating the need for a reducer or mechanical transmission components, saving space. Its extremely high transmission efficiency will further significantly reduce mechanical losses caused by mechanical components.

[0016] This utility model incorporates a tension / compression sensor, placed in the middle of the equipment, which significantly reduces the impact of vibration and shock caused by the worktable. The inner ring of the tension / compression sensor is connected to the rotating ball screw nut, and this structure avoids the influence of friction caused by the equipment itself.

[0017] The motor output shaft and the rotary nut input shaft are connected by a double flat key, which increases the smoothness of the rotational connection and reduces the impact of unbalanced vibration caused by high-speed rotation of a single key on the tension and compression sensors.

[0018] The use of aluminum for the cylinder greatly reduces the overall weight of the machine, lightens the load on the workbench, and improves handling or installation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a cross-sectional view of an embodiment of the present utility model.

[0021] Figure 3 This is a schematic diagram of the connection between the tension / compression sensor and the rotating ball screw nut in an embodiment of this utility model.

[0022] Figure 4This is a schematic diagram of the connection between the motor output shaft and the direct-drive hollow motor in an embodiment of this utility model.

[0023] Figure 5 This is a schematic diagram showing the connection between the rotary nut input shaft, the motor output shaft, and the direct-drive hollow motor in an embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the connection between the rotary nut input shaft and the rotary ball screw nut in an embodiment of this utility model.

[0025] Figure 7 This is a schematic diagram of the cylinder of one embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of a motor mounting flange according to an embodiment of this utility model.

[0027] Figure 9 This is a schematic diagram of the motor mounting lower flange according to an embodiment of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] As shown in the figure, this utility model discloses a direct-drive servo electric cylinder, including a cylinder barrel 1. A linear spline sleeve 2 is installed on the inner side of the bottom of the cylinder barrel 1. A tension / compression sensor 4 is installed between the top of the cylinder barrel 1 and the lower motor mounting flange 3. The other end of the lower motor mounting flange 3 is connected to the motor mounting flange 5. The motor mounting flange 5 is connected to a direct-drive hollow motor 6. A lead screw 7 passes through the direct-drive hollow motor 6 and the linear spline sleeve 2. A rotating ball screw nut 8 is installed between the linear spline sleeve 2 and the direct-drive hollow motor 6. A motor output shaft 9 is installed at the output end of the direct-drive hollow motor 6. A rotating nut input shaft 10 is installed at the end of the motor output shaft 9. The rotating nut input shaft 10 is connected to the rotating part of the rotating ball screw nut 8. The fixed part of the rotating ball screw nut 8 is connected to the inner ring of the tension / compression sensor 4.

[0030] The lead screw 7 passes through the direct-drive hollow motor 6, which meets the needs of small space use. Because the direct-drive hollow motor 6 is hollow, the heat dissipation performance is greatly improved, which meets the requirements of high-frequency, high-speed and full-load operation.

[0031] This utility model incorporates a tension / compression sensor 4, which is placed in the middle of the equipment, significantly reducing the impact of vibration and shock caused by the worktable. The inner ring of the tension / compression sensor 4 is connected to the rotating ball screw nut 8. This structure avoids the influence of friction caused by the equipment itself.

[0032] The direct-drive hollow motor 6 of this invention drives the rotating nut input shaft 10 to rotate through the motor output shaft 9, and the rotating nut input shaft 10 drives the rotating ball screw nut 8 to rotate. This eliminates the traditional reducer, saves space, improves transmission efficiency, and further reduces mechanical losses caused by mechanical parts.

[0033] In one embodiment of the present invention, the rotating parts of the rotary nut input shaft 10 and the rotary ball screw nut 8 are connected by several bolts, and the rotary nut input shaft 10 is connected to the motor output shaft 9 by a flat key. The present invention improves the connection method between the rotary nut input shaft 10 and the rotary ball screw nut 8, eliminating the need for fasteners and facilitating disassembly.

[0034] The rotating ball screw nut 8 and the screw 7 together form a rotating ball screw, a common transmission mechanism, such as...

[0035] In one embodiment of the present invention, the motor output shaft 9 is provided with a rotating nut input shaft mounting hole 91, and the motor output shaft is provided with a stepped surface 92. The end of the rotating nut input shaft 10 is located at the stepped surface 92 of the motor output shaft 9. The outer side of the rotating nut input shaft 10 is provided with a plurality of flat key mounting slots 1001, and the motor output shaft 9 is provided with a plurality of flat key mounting slots 93. The flat key mounting slots 1001 and 93 correspond to each other, and flat keys 11 are installed at the flat key mounting slots 1001 and 93. The structure of the motor output shaft 9 facilitates connection with the direct-drive hollow motor 6.

[0036] In one embodiment of the present invention, the cylinder 1 is provided with an inner cavity 101, an inner cavity 2 102 and an inner cavity 3 103 connected in sequence. The diameters of the inner cavities 101, 2 102 and 3 103 gradually increase. The linear spline sleeve 2 passes through the inner cavity 101, and the rotating ball screw nut 8 is located at the inner cavities 2 102 and 3 103.

[0037] In one embodiment of the present invention, the linear spline sleeve 2 includes a first connecting sleeve 21 and a second connecting sleeve 22. The outer diameter of the first connecting sleeve 21 is smaller than the outer diameter of the second connecting sleeve 22. The first connecting sleeve 21 is located in the first inner cavity 101, and the second connecting sleeve 22 is located in the second inner cavity 102. The second connecting sleeve 22 is connected to the cylinder 1.

[0038] Connecting sleeve 22 is connected to cylinder 1 by several fasteners. Linear spline sleeve 2 ensures that lead screw 7 moves linearly without rotating.

[0039] In one embodiment of the present invention, the cylinder barrel 1 is made of aluminum. Aluminum facilitates heat dissipation and is lighter than iron or steel.

[0040] In one embodiment of the present invention, the tension / compression sensor 4 is a spoke-type tension / compression sensor.

[0041] In one embodiment of the present invention, there are two parallel keys 11, which are symmetrically arranged. The motor output shaft 9 and the rotary nut input shaft 10 are connected by two parallel keys, which increases the stability of the rotational connection and reduces the impact of unbalanced vibration caused by high-speed rotation of a single key on the tension / compression sensor 4.

[0042] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A direct-drive servo electric cylinder, characterized in that: The system includes a cylinder barrel, a linear spline sleeve mounted on the inner bottom of the cylinder barrel, a tension / compression sensor mounted between the top of the cylinder barrel and the lower motor mounting flange, the other end of the lower motor mounting flange connected to the motor mounting flange, the motor mounting flange connected to a direct-drive hollow motor, a lead screw passing through the direct-drive hollow motor and the linear spline sleeve, a rotary ball screw nut between the linear spline sleeve and the direct-drive hollow motor, a motor output shaft mounted at the output end of the direct-drive hollow motor, a rotary nut input shaft mounted at the end of the motor output shaft, the rotary nut input shaft connected to the rotating part of the rotary ball screw nut, and the fixed part of the rotary ball screw nut connected to the inner ring of the tension / compression sensor.

2. The direct-drive servo electric cylinder according to claim 1, characterized in that: The rotating part of the rotary nut input shaft is connected to the rotating ball screw nut by several bolts, and the rotary nut input shaft is connected to the motor output shaft by a flat key.

3. The direct-drive servo electric cylinder according to claim 2, characterized in that: The motor output shaft is provided with a rotating nut input shaft mounting hole and a stepped surface. The end of the rotating nut input shaft is located at the stepped surface of the motor output shaft. Several flat key mounting slots 1 are provided on the outer side of the rotating nut input shaft, and several flat key mounting slots 2 are provided on the motor output shaft. Flat key mounting slots 1 and 2 correspond to each other, and flat keys are installed at flat key mounting slots 1 and 2.

4. The direct-drive servo electric cylinder according to claim 1, characterized in that: The cylinder has three inner cavities connected in sequence: inner cavity one, inner cavity two, and inner cavity three. The diameters of inner cavity one, inner cavity two, and inner cavity three gradually increase. A straight spline sleeve passes through inner cavity one, and the rotating ball screw nut is located in inner cavity two and inner cavity three.

5. The direct-drive servo electric cylinder according to claim 4, characterized in that: The linear spline sleeve includes a connecting sleeve one and a connecting sleeve two. The outer diameter of the connecting sleeve one is smaller than the outer diameter of the connecting sleeve two. The connecting sleeve one is located inside the inner cavity one, and the connecting sleeve two is located in the inner cavity two. The connecting sleeve two is connected to the cylinder.

6. The direct-drive servo electric cylinder according to claim 1, characterized in that: The cylinder barrel is made of aluminum.

7. The direct-drive servo electric cylinder according to claim 1, characterized in that: The tension / compression sensor is a spoke-type tension / compression sensor.

8. The direct-drive servo electric cylinder according to claim 3, characterized in that: There are two parallel keys, arranged symmetrically.

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