Lightweight electric cylinder

Abstract

The utility model discloses a lightweight electric cylinder, which relates to the technical field of electric cylinders and comprises a servo motor, a main lead screw fixedly connected to the upper end of a bearing, a hollow main lead screw, an outer cylinder fixedly connected to the upper end of a base, a plurality of holes formed in the middle of the outer cylinder, a stop block fixedly connected to the upper end of the outer cylinder, and a first connecting seat structure arranged on the upper portion of the stop block. A planetary roller lead screw is arranged on the outer surface of the main lead screw and used for converting rotary motion of the servo motor into linear motion of the device output shaft. According to the electric cylinder, the servo motor is directly connected with the lead screw structure, the output end of the servo motor is fixedly connected with the lower end of the bearing, and therefore the servo motor can directly drive the bearing to rotate, dependence on a gearbox is reduced, and the overall weight of the electric cylinder can be reduced; therefore, the weight of the main lead screw can be reduced, and the overall weight of the electric cylinder can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric cylinders, in particular to a lightweight electric cylinder. Background Art

[0002] An electric cylinder is an electric drive device that converts the rotational motion of a motor into the linear motion of a push rod. It is mainly composed of a servo motor, an electric cylinder body, a transmission device, and a position feedback device. Electric cylinders are widely used in machinery, metallurgy, mining, transportation, construction and other industries. They can replace hydraulic and pneumatic systems and have the advantages of long service life, low noise, fast response, simple maintenance and easy installation. In addition, electric cylinders can be divided into linear and parallel types according to their appearance and structure, and can be divided into short-stroke series, high-rigidity series and thin series according to their performance. Their working principle is to convert the rotational motion of the motor into the linear motion of the push rod through a lead screw nut, and at the same time achieve precise speed and position control through precise speed control.

[0003] The traditional gearbox design occupies a large volume and weight in the electric cylinder, which not only increases the overall cost of the electric cylinder, but also limits its application in some specific occasions. For example, in fields such as aerospace and medical equipment that have extremely high requirements on weight and volume, the traditional gearbox design seems to be unable to cope with the situation. In addition, the production cost of traditional gearboxes is also relatively high, because its manufacturing process requires multiple steps and complex processes such as heat treatment, which undoubtedly increases the production cost of the electric cylinder. In addition, the transmission efficiency of traditional gearboxes needs to be improved. Due to the friction and loss between gears, the transmission efficiency of the gearbox is often affected, resulting in energy loss and heat generation during the operation of the electric cylinder. This not only affects the performance and stability of the electric cylinder, but may also shorten its service life.

[0004] Chinese patent document CN217362806U discloses a lightweight electric cylinder, including an outer cylinder, a push rod connected to the outer cylinder through a ball screw, one end of the outer cylinder connected to a motor reducer through a gear box, the side of the gear box away from the outer cylinder is connected to a lower support ear, the end of the push rod away from the lower support ear is connected to an upper support ear, the lower support ear is connected to the gear box through a bearing chamber, the bearing chamber is detachably connected to the gear box, a thrust bearing is arranged in the bearing chamber, a gear connected to the motor reducer is arranged in the gear box, and the ball screw is connected to the thrust bearing and the gear; but the following defects still exist in the implementation process:

[0005] Although the gearbox of the device in the above document is not subject to a large axial force rating, and therefore lightweight materials can be used, and the weight is greatly reduced compared to a traditional electric cylinder, the motor of the device in the above document is not directly connected to the main screw, and thus a gearbox is still required when the device is running. In addition, the main screw of the device in the above document is solid, which makes the main screw heavier, thereby affecting the overall weight of the electric cylinder. Summary of the invention

[0006] The purpose of the utility model is to provide a lightweight electric cylinder to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A lightweight electric cylinder comprises a servo motor; a screw rod structure is fixedly connected to one side of the servo motor, the screw rod structure comprises a base, a bearing is rotatably connected to the middle part of the base, the lower end of the bearing is fixedly connected to the output end of the servo motor, the upper end of the bearing is fixedly connected to a main screw rod, the middle part of the main screw rod is hollow, the upper end of the base is fixedly connected to an outer cylinder, a plurality of holes are opened in the middle part of the outer cylinder, a stopper is fixedly connected to the upper end of the outer cylinder, a first connecting seat structure is arranged on the upper part of the stopper, a planetary roller screw is arranged on the outer surface of the main screw rod, the planetary roller screw is used to convert the rotational motion of the servo motor into the linear motion of the output shaft of the device, a stainless steel conduit is fixedly connected to the upper end of the planetary roller screw, a second connecting seat structure is arranged on one side of the base, a third connecting seat structure is symmetrically arranged on the base, and a guide block is fixedly connected to one side of the planetary roller screw.

[0009] A further improvement of the technical solution of the utility model is that: a slide groove 1 is opened on one side of the outer cylinder, and the inner cavity of the slide groove 1 is slidably connected with the outer surface of the guide block.

[0010] The above technical solution is adopted, in which the position of the guide block is limited by the sliding connection between the slide groove and the guide block. In addition, the guide block is fixedly connected to the planetary roller screw, so that the position of the planetary roller screw can be limited by the guide block. At the same time, the position of the guide block is limited by the slide groove, so that the bolts required for installing the guide block can be reduced, thereby reducing the overall weight of the electric cylinder.

[0011] A further improvement of the technical solution of the utility model is that a second slide groove is provided at the lower part of the outer cylinder, and the inner cavity of the second slide groove is rotatably connected to the outer surface of the bearing.

[0012] The above technical solution is adopted. In this solution, the position of the bearing can be limited when the bearing rotates through the cooperation between the second slide groove and the bearing, so as to prevent the bearing from getting off the track during the rotation process.

[0013] A further improvement of the technical solution of the utility model is that the first connecting seat structure includes a main board 1, a plurality of threaded holes 1 are opened in the middle of the main board 1, the inner cavity of the threaded hole 1 is threadedly connected with a bolt 1, the plurality of bolts 1 are threadedly connected to the block together, and the main board 1 is symmetrically opened with a plurality of threaded holes 2.

[0014] The above technical solution is adopted, in which the main board 1 and the block are connected together by the cooperation of the threaded hole 1 and the bolt 1, and then the device can be fixed at the position where it needs to be fixed by the cooperation of the threaded hole 2 and the other screw rod 4. When there is no need to fix the device with other structures through the first connecting seat structure, the first connecting seat structure can be separated from the block, thereby reducing the overall weight of the electric cylinder.

[0015] A further improvement of the technical solution of the utility model is that the second connecting seat structure includes two clamping blocks 1, the two clamping blocks 1 are fixedly connected to the base, the two clamping blocks 1 are symmetrically slidably connected to a threaded column 1, the two clamping blocks 1 are provided with a clamping groove 1 on one side away from the base, the two clamping grooves 1 are slidably connected to a main board 2, the main board 2 is slidably connected to the two threaded columns 1, and a nut is threadedly connected to one side of the threaded column 1.

[0016] By adopting the above technical solution, when the position of the electric cylinder needs to be fixed or the electric cylinder needs to be supported, the main board 2 and the block 1 can be connected together by utilizing the cooperation of the threaded column 1 and the nut, and then the position of the device can be fixed by utilizing the cooperation of several holes opened on the main board 2 and other screw rods 4. When the electric cylinder does not need to be fixed by the second connecting seat structure, the main board 2 can be removed from the inner cavity of the card slot 1, thereby reducing the overall weight of the electric cylinder.

[0017] A further improvement of the technical solution of the utility model is that the third connecting seat structure includes a second clamping block, which is fixedly connected to the base, a support plate is slidably connected to the middle of the second clamping block, a second bolt is threadedly connected to the upper part of the support plate, the second bolt is threadedly connected to the second clamping block, and a plurality of bottom holes are opened at the lower part of the support plate.

[0018] By adopting the above technical solution, the position of the support plate can be limited by the cooperation between bolt two, block two and the support plate, and then the device can be supported and fixed by the cooperation between the bottom hole and other screw rods four. When the electric cylinder does not need to be supported and fixed by the third connecting seat structure, the support plate can be slid and removed from the inner cavity of block two, thereby reducing the overall weight of the electric cylinder.

[0019] A further improvement of the technical solution of the utility model is that the guide block is T-shaped.

[0020] The above technical solution is adopted. By setting the guide block to be T-shaped, compared with the traditional guide rod, not only the material is reduced and the overall weight of the electric cylinder is reduced, but the T-shaped design can also allow the guide block to provide higher rigidity and stability, because the guide block can better withstand lateral force and bending moment, thereby ensuring the accuracy and stability of the electric cylinder. In addition, because the guide block is T-shaped, the contact area between the guide block and the slide groove is larger, which can provide better support and guiding effects.

[0021] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0022] 1. The utility model provides a lightweight electric cylinder, which is directly connected to the lead screw structure by a servo motor, so that the output end of the servo motor is fixedly connected to the lower end of the bearing, so that the servo motor can directly drive the bearing to rotate, thereby reducing the dependence on the gear box, thereby reducing the overall weight of the electric cylinder, and by setting the main lead screw to be hollow, the weight of the main lead screw can be reduced, thereby reducing the overall weight of the electric cylinder. In addition, by opening a plurality of holes in the middle of the outer cylinder, the volume and weight of the outer cylinder can be reduced, thereby reducing the weight of the entire electric cylinder, making it lighter, and by using a plurality of holes, the heat dissipation area of ​​the outer cylinder can be increased, thereby improving the heat dissipation performance.

[0023] 2. The utility model provides a lightweight electric cylinder. By arranging a first connecting seat structure on the upper part of the stopper, and arranging a second connecting seat structure and a third connecting seat structure on the end surface of the base, the electric cylinder can be adapted to different installation methods, thereby improving the installation flexibility of the electric cylinder. In addition, by being able to separate the stopper from the first connecting seat structure, the clamping block 1 from the main board 2, and the clamping block 2 from the support plate, the electric cylinder can be fixedly installed as needed to reduce its overall weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a partial cross-sectional schematic diagram of the overall structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the linear transmission structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the screw rod structure of the utility model;

[0029] Figure 5 It is a schematic diagram of the outer cylinder of the utility model;

[0030] Figure 6 It is a cross-sectional schematic diagram of the outer cylinder of the utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the first connecting seat of the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the second connecting seat of the utility model;

[0033] Fig. 9 This is a schematic diagram of the structure of the third connecting seat of the utility model;

[0034] In the figure: 1. servo motor; 2. screw structure; 21. base; 22. bearing; 23. main screw; 3. outer cylinder; 31. hole; 32. slide slot 1; 33. slide slot 2; 4. stopper; 5. first connecting seat structure; 51. main board 1; 52. threaded hole 1; 53. bolt 1; 54. threaded hole 2; 6. planetary roller screw; 7. stainless steel guide tube; 8. second connecting seat structure; 81. block 1; 82. threaded column 1; 83. slot 1; 84. main board 2; 9. third connecting seat structure; 91. block 2; 92. support plate; 93. bolt 2; 94. bottom hole; 10. guide block. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the embodiments:

[0036] Example 1

[0037] like Figure 1-9 As shown, the utility model provides a lightweight electric cylinder, including a servo motor 1; a screw structure 2 is fixedly connected to one side of the servo motor 1, and the screw structure 2 includes a base 21, a bearing 22 is rotatably connected to the middle of the base 21, the lower end of the bearing 22 is fixedly connected to the output end of the servo motor 1, and a main screw 23 is fixedly connected to the upper end of the bearing 22. The middle part of the main screw 23 is hollow, and an outer cylinder 3 is fixedly connected to the upper end of the base 21. A plurality of holes 31 are opened in the middle of the outer cylinder 3, and a stopper 4 is fixedly connected to the upper end of the outer cylinder 3. A first connecting seat structure 5 is arranged on the upper part of the stopper 4, and a planetary roller screw 6 is arranged on the outer surface of the main screw 23. The planetary roller screw 6 is used to convert the rotational motion of the servo motor 1 into the linear motion of the output shaft of the device, and a stainless steel guide tube 7 is fixedly connected to the upper end of the planetary roller screw 6. A second connecting seat structure 8 is arranged on one side of the base 21, and a third connecting seat structure 9 is symmetrically arranged on the base 21. A guide block 10 is fixedly connected to one side of the planetary roller screw 6.

[0038] In this embodiment, the servo motor 1 can convert electrical energy into mechanical energy to drive the electric cylinder to perform linear motion. The output end of the servo motor 1 is fixedly connected to the lower end of the bearing 22, so that the output end of the servo motor 1 can be used to drive the bearing 22 to rotate, and then the bearing 22 is used to drive the main screw 23 to rotate, so that the planetary roller screw 6 and the stainless steel guide tube 7 can be driven to rise and fall. By setting the middle of the main screw 23 to be hollow, the weight of the main screw 23 can be reduced, and then the weight of the electric cylinder as a whole can be reduced. By opening a plurality of holes 31 in the middle of the outer cylinder 3, the volume and weight of the outer cylinder 3 can be reduced, thereby reducing the weight of the entire electric cylinder, so that It is more lightweight, and the electric cylinder can be connected to other structures through the first connecting seat structure 5, thereby improving the installation flexibility of the device; by arranging a planetary roller screw 6 on the outer surface of the main screw 23, the threaded rollers on the planetary roller screw 6 can be used to support the load with multiple contact points at the same time, so it has higher load-bearing capacity and rigidity, which makes it relatively small in size when it is subjected to the static load that the ball screw of the same specification can withstand, thereby reducing the overall weight of the electric cylinder; through the cooperation of the second connecting seat structure 8 and the third connecting seat structure 9, the second connecting seat structure 8 and the third connecting seat structure 9 can be used to connect the electric cylinder to different devices.

[0039] Example 2

[0040] like Figure 3-7 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, a slide groove 32 is opened on one side of the outer cylinder 3, the inner cavity of the slide groove 32 is slidably connected to the outer surface of the guide block 10, a slide groove 23 is opened at the lower part of the outer cylinder 3, the inner cavity of the slide groove 23 is rotatably connected to the outer surface of the bearing 22, the first connecting seat structure 5 includes a main board 51, a plurality of threaded holes 52 are opened in the middle of the main board 51, the inner cavities of the threaded holes 52 are all threadedly connected with bolts 53, and the plurality of bolts 53 are threadedly connected to the stopper 4 together, the main board 51 is symmetrically opened with a plurality of threaded holes 54, and the guide block 10 is T-shaped.

[0041] In this embodiment, when the electric cylinder needs to be connected to other structures, the main board 51 and the stopper 4 can be fixedly connected together by the cooperation of a plurality of bolts 53 and threaded holes 52, and then the electric cylinder can be connected to other structures by the cooperation of other screws and a plurality of threaded holes 54, and then the bearing 22 is driven to rotate by the output end of the servo motor 1, so that the bearing 22 can rotate in the inner cavity of the slide groove 33, and then the main screw 23 is driven to rotate by the bearing 22, so that the main screw 23 can cooperate with the planetary roller screw 6 to drive the stainless steel conduit 7 to rise and fall, and then drive the guide block 10 to slide in the inner cavity of the slide groove 32 to limit the position of the planetary roller screw 6.

[0042] Example 3

[0043] like Figure 8 As shown, on the basis of Example 2, the utility model provides a technical solution: preferably, the second connecting seat structure 8 includes two clamping blocks 81, the two clamping blocks 81 are fixedly connected to the base 21, the two clamping blocks 81 are symmetrically slidably connected with a threaded column 82, the two clamping blocks 81 are provided with a clamping groove 83 on the side away from the base 21, the two clamping grooves 83 are slidably connected with a main board 2 84, the main board 2 84 is slidably connected with the two threaded columns 82, and a nut is threadedly connected on one side of the threaded column 82.

[0044] In this embodiment, when it is necessary to use the second connecting seat structure 8 to fix the electric cylinder to other structures, first slide the main board 84 into the inner cavity of the card slot 83, and then pass the outer surface of the threaded column 82 through the inner cavity of the hole opened by the block 81 and the inner cavity of the hole opened by the main board 84 in turn, and then the threaded column 82 cooperates with the nut to fix the position of the main board 84, and then the electric cylinder can be fixed by cooperating with several holes opened on the main board 84 and other screws, and then repeat the above steps to let the electric cylinder run.

[0045] Example 4

[0046] like Fig. 9 As shown, on the basis of Example 2, the utility model provides a technical solution: preferably, the third connecting seat structure 9 includes a second block 91, the second block 91 is fixedly connected to the base 21, the middle part of the second block 91 is slidably connected to a support plate 92, the upper part of the support plate 92 is threadedly connected to a second bolt 93, the second bolt 93 is threadedly connected to the second block 91, and a plurality of bottom holes 94 are opened at the lower part of the support plate 92.

[0047] In this embodiment, when the third connecting seat structure 9 is needed to fix the electric cylinder to other structures, the support plate 92 is first slid and pushed into the inner cavity of the second clamping block 91, and then the outer surface of the second bolt 93 is abnormally passed through the hole opened in the second clamping block 91 and the hole opened in the support plate 92, and the position of the support plate 92 is fixed by the second bolt 93, and then the electric cylinder can be fixed by the cooperation of several bottom holes 94 and other screws, and then the above operation steps are repeated to allow the electric cylinder to run.

[0048] The following is a detailed description of the working principle of the lightweight electric cylinder.

[0049] like Figure 1-9As shown, when the electric cylinder needs to be connected to other structures, the main board 51 and the stopper 4 can be fixedly connected together by the cooperation of several bolts 53 and threaded holes 52, and then the electric cylinder can be connected to other structures by the cooperation of other screws and several threaded holes 54, and then the bearing 22 is driven to rotate by the output end of the servo motor 1, so that the bearing 22 can rotate in the inner cavity of the slide groove 33, and then the main screw 23 is driven to rotate by the bearing 22, so that the main screw 23 can cooperate with the planetary roller screw 6 to drive the stainless steel guide tube 7 to rise and fall, and then drive the guide block 10 to slide in the inner cavity of the slide groove 32 to limit the position of the planetary roller screw 6;

[0050] When the electric cylinder needs to be fixed to other structures using the second connecting seat structure 8, first slide the main board 84 into the inner cavity of the card slot 83, then sequentially pass the outer surface of the threaded column 82 through the inner cavity of the hole opened by the card block 81 and the inner cavity of the hole opened by the main board 84, and then fix the position of the main board 84 through the cooperation of the threaded column 82 and the nut, and then fix the electric cylinder through the cooperation of several holes opened on the main board 84 and other screws, and then repeat the above steps to make the electric cylinder run;

[0051] When the third connecting seat structure 9 is needed to fix the electric cylinder to other structures, first slide the support plate 92 into the inner cavity of the second clamping block 91, and then let the outer surface of the second bolt 93 pass through the hole opened in the second clamping block 91 and the hole opened in the support plate 92, and fix the position of the support plate 92 by the second bolt 93, and then fix the electric cylinder by the cooperation of several bottom holes 94 and other screws, and then repeat the above steps to make the electric cylinder run.

[0052] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A lightweight electric cylinder, comprising a servo motor (1); characterized in that: A screw rod structure (2) is fixedly connected to one side of the servo motor (1), and the screw rod structure (2) comprises a base (21). A bearing (22) is rotatably connected to the middle of the base (21). The lower end of the bearing (22) is fixedly connected to the output end of the servo motor (1). The upper end of the bearing (22) is fixedly connected to a main screw rod (23). The middle of the main screw rod (23) is hollow. The upper end of the base (21) is fixedly connected to an outer cylinder (3). A plurality of holes (31) are provided in the middle of the outer cylinder (3). A stopper (4) is fixedly connected to the upper end of the outer cylinder (3). The stopper (4) is provided with a first connection seat structure (5) on its upper part, the main screw (23) is provided with a planetary roller screw (6) on its outer surface, the planetary roller screw (6) is used to convert the rotational motion of the servo motor (1) into the linear motion of the output shaft of the device, the upper end of the planetary roller screw (6) is fixedly connected with a stainless steel guide tube (7), one side of the base (21) is provided with a second connection seat structure (8), the base (21) is symmetrically provided with a third connection seat structure (9), and one side of the planetary roller screw (6) is fixedly connected with a guide block (10).

2. A lightweight electric cylinder according to claim 1, characterized in that: A slide groove (32) is provided on one side of the outer cylinder (3), and the inner cavity of the slide groove (32) is slidably connected to the outer surface of the guide block (10).

3. A lightweight electric cylinder according to claim 2, characterized in that: A second slide groove (33) is provided at the lower portion of the outer cylinder (3), and the inner cavity of the second slide groove (33) is rotatably connected to the outer surface of the bearing (22).

4. The lightweight electric cylinder according to claim 1, characterized in that: The first connection seat structure (5) comprises a main board (51), a plurality of threaded holes (52) are provided in the middle of the main board (51), the inner cavities of the threaded holes (52) are all threadedly connected with bolts (53), and the plurality of bolts (53) are threadedly connected to the stopper (4) together, and the main board (51) is symmetrically provided with a plurality of threaded holes (54).

5. The lightweight electric cylinder according to claim 1, characterized in that: The second connection seat structure (8) comprises two clamping blocks (81), the two clamping blocks (81) are fixedly connected to the base (21), the two clamping blocks (81) are symmetrically slidably connected to a threaded column (82), the two clamping blocks (81) are provided with a clamping groove (83) on one side away from the base (21), the two clamping grooves (83) are slidably connected to a main board (84), the main board (84) is slidably connected to the two threaded columns (82), and one side of the threaded column (82) is threadedly connected to a nut.

6. A lightweight electric cylinder according to claim 5, characterized in that: The third connection seat structure (9) comprises a second clamping block (91), the second clamping block (91) is fixedly connected to the base (21), a support plate (92) is slidably connected to the middle of the second clamping block (91), a second bolt (93) is threadedly connected to the upper part of the support plate (92), the second bolt (93) is threadedly connected to the second clamping block (91), and a plurality of bottom holes (94) are opened at the lower part of the support plate (92).

7. The lightweight electric cylinder according to claim 2, characterized in that: The guide block (10) is T-shaped.

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