Novel direct-connection electric cylinder device

Abstract

The novel direct-connection electric cylinder device comprises a cylinder body, a lead screw, a push rod, a coupler and a motor, a front end cover and a bearing seat are arranged at the front end and the rear end of the cylinder body respectively, and the bearing seat serves as a rear end cover of the cylinder body and is matched with the front end cover to seal the internal environment of the cylinder body; a plurality of bearings are regularly mounted in the bearing seat, a direct connecting seat, a bottom plate and a motor are sequentially arranged at the rear end of the bearing seat, and the motor is fixed behind the direct connecting seat through the bottom plate; the lead screw is connected with the push rod through the piston, and the piston serves as a middle piece of the lead screw and the push rod to splice and install the lead screw and the push rod together. The novel direct-connection electric cylinder device is small in size, light in weight, long in service life and better in stability, performance and precision. And installation and maintenance work are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission, in particular to a novel direct-connected electric cylinder device. Background Art

[0002] The electric cylinder is a device that converts rotational motion into linear motion. Through the cooperation of the servo motor and the ball screw, the rotational motion of the servo motor is converted into linear motion through the ball screw.

[0003] Existing electric cylinder products have the following problems:

[0004] 1. The end cover at the front end of the cylinder body is usually sealed with only a copper sleeve. As the product (push rod) reciprocates for a long time, the sealing effect will deteriorate. Therefore, the copper sleeve needs to be replaced frequently to ensure the sealing effect inside the cylinder body, thereby ensuring the performance and accuracy of the electric cylinder.

[0005] 2. The bearing seat at the rear end of the cylinder body generally needs to be installed with multiple ball bearings, which are generally directly arranged and installed at the front and rear ends of the bearing seat. As the lead screw rotates in the ball bearing for a long time, the ball bearing will become loose, which will affect the performance and accuracy of the electric cylinder.

[0006] 3. In order to reduce weight, common electric cylinders generally use plastic materials. Although plastic materials can reduce weight, they have a short lifespan and poor stability. Utility Model Content

[0007] The technical problem solved by the utility model is to provide a novel direct-connected electric cylinder device with small volume, large transmission and good stability.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] A new type of direct-connected electric cylinder device, including a cylinder body, a lead screw, a push rod, a coupling and a motor.

[0010] The front and rear ends of the cylinder body are respectively provided with a front end cover and a bearing seat, the bearing seat serving as the rear end cover of the cylinder body and cooperating with the front end cover to seal the internal environment of the cylinder body;

[0011] A plurality of bearings are regularly arranged inside the bearing seat, and a direct connection seat, a bottom plate and the motor are sequentially arranged at the rear end thereof, and the motor is fixed to the rear of the direct connection seat through the bottom plate;

[0012] The lead screw is connected to the push rod through a piston, and the piston serves as an intermediate piece between the lead screw and the push rod, which are spliced ​​and installed together. The lead screw includes a lead screw and a lead screw nut. The push rod is tubular and fixed to the front end of the piston and extends out of the front end cover. The push rod is in sealing contact with the front end cover. The lead screw nut is fixed to the rear end of the piston. The front end of the lead screw passes through the lead screw nut and the piston and is arranged inside the tubular push rod. The rear end of the lead screw passes through the bearing seat and the several bearings inside the bearing seat. The rear end of the lead screw is connected to the rotating shaft of the motor through the coupling, and the coupling is arranged in the internal chamber of the direct connection seat.

[0013] The outer surface of the piston is regularly provided with a number of annular notches, and wear-resistant rings are respectively installed thereon to form a number of wear-resistant rings; a number of guide key grooves are also regularly provided at the middle position of its outer surface along its length direction, and guide keys are respectively installed thereon to form a number of guide keys; the piston contacts the inner wall of the cylinder body through the several wear-resistant rings on its outer surface, and the piston cooperates with the several guide grooves arranged on the inner wall of the cylinder body through the several guide keys on its outer surface to limit and stabilize the transmission path of the piston.

[0014] Furthermore, the front end cover is penetrated from top to bottom and is provided with a push rod extension hole for facilitating the extension of the push rod; the upper end of the push rod extension hole is provided with a dust ring installation groove, and a dust ring is installed in cooperation with it; the lower end of the push rod extension hole is provided with a copper sleeve installation groove, and a copper sleeve is installed in cooperation with it; the push rod extends out of the front end cover from the push rod extension hole and contacts with the inner wall, and the push rod passes through the copper sleeve and the dust ring in turn and contacts with them in a sealing manner.

[0015] Furthermore, weight-reducing grooves with upper openings are regularly arranged on the front, rear, left and right four surfaces of the front end cover. The weight-reducing grooves with upper openings are recessed inward along the middle parts of the front, rear, left and right four surfaces of the front end cover and are designed along the upper opening of the front end cover.

[0016] Furthermore, a plurality of positioning notches are regularly arranged at the lower ends of the front and rear faces or left and right faces of the front cover at the slot positions on the front and rear faces or left and right faces of the cylinder body to achieve rapid positioning and assembly of the front cover and the cylinder body.

[0017] Furthermore, bolt mounting holes with steps are regularly arranged at the four corners of the front end cover.

[0018] Furthermore, a direct connection seat chamber is provided through the upper and lower parts of the direct connection seat, and the coupling at the rear end of the screw rod is placed in the direct connection seat chamber.

[0019] Furthermore, R-angle grooves of a certain depth are respectively arranged at the four corners of the direct-connection seat, and the R-angle grooves are fan-shaped grooves, which are obtained by cutting upward at a certain depth starting from the bottom end of the direct-connection seat; the four corners of the direct-connection seat are at the top end of the R-angle grooves to form bolt mounting feet, and bolt mounting through holes are opened to facilitate the passage of bolts.

[0020] Furthermore, the bearing seat is provided with a screw rod extension hole from top to bottom, and a bearing mounting groove is regularly provided at the upper end of the screw rod extension hole, the aperture of the bearing mounting groove is larger than the aperture of the screw rod extension hole, and the plurality of bearings are installed in the bearing mounting groove; the upper end of the bearing mounting groove is regularly provided with a bearing seat end cover mounting groove, and a bearing seat end cover is installed, and the upper and lower ends of the bearing seat end cover are respectively provided with an upper boss and a lower boss, the upper boss of the bearing seat end cover is snapped into the lower end of the cylinder body and fits and seals with the inner wall of the lower end of the cylinder body, the lower boss of the bearing seat end cover is snapped into the bearing mounting groove and fits and seals with the inner wall of the bearing mounting groove, and the lower boss of the bearing seat end cover presses the plurality of bearings in the bearing mounting groove.

[0021] Furthermore, a lower boss of the bearing seat is also provided at the lower end of the bearing seat, and a slot hole is regularly provided at the upper end of the direct connection seat for facilitating the insertion and sealing installation of the lower boss of the bearing seat.

[0022] Furthermore, a transfer rod is provided at the front end of the push rod, and the rear end of the transfer rod is sealingly connected to the front end of the push rod to seal the front end of the screw rod inside the push rod.

[0023] The beneficial effects of the utility model are:

[0024] 1. The utility model can greatly improve the service life of the entire product by arranging a plurality of wear-resistant rings and guide keys on the piston, thereby ensuring the stability, performance and precision of the product during long-term use.

[0025] 2. The utility model can improve the stability of the bearing rotation by encapsulating a plurality of bearings inside the bearing seat and pressing and fixing them by the bearing seat end cover at the upper end, thereby improving the stability of the screw rod rotation in the bearing.

[0026] 3. The utility model adopts a metal front end cover, and an upper boss is arranged on the upper end of the metal front end cover, and weight-reducing grooves are arranged on the front, back, left and right four surfaces of the metal front end cover, thereby effectively reducing the volume and weight of the metal front end cover without destroying the strength of the metal front end cover, and thus reducing the overall weight of the product.

[0027] 4. The utility model provides dustproof rings and copper sleeves at the upper and lower ends of the front end cover, respectively. The copper sleeves are long, which can effectively prevent dust from the outside environment from entering the cylinder body and effectively prevent the oil inside the cylinder body from leaking out. Moreover, the copper sleeve is in contact with the push rod, which can play a role in lubrication, shock absorption and support for the push rod.

[0028] 5. The utility model has R-shaped grooves regularly arranged at the four corners of the direct connection seat, thereby effectively reducing the weight of the direct connection seat and facilitating the installation and maintenance of the motor and the overall product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the utility model;

[0030] Figure 2 for Figure 1 Structural diagram of the internal components;

[0031] Figure 3 for Figure 2 The structural diagram of the middle piston 5;

[0032] Figure 4 for Figure 1 A structural diagram of the middle and front end cover 12;

[0033] Figure 5 for Figure 4 The three-dimensional structure diagram;

[0034] Figure 6 for Figure 1 The structural diagram of the middle direct connection seat 14;

[0035] Figure 7 for Figure 6 Another structural diagram from another perspective;

[0036] Figure 8 for Figure 1 The structure diagram of the middle cylinder body 11 and the bearing seat 13;

[0037] The markings in the figure are:

[0038] 11. Cylinder body, 12. Front end cover, 13. Bearing seat, 14. Direct connection seat, 15. Bottom plate;

[0039] 2. Coupling, 3. Bearing, 41. Screw, 42. Screw nut, 43. Limit nut, 44. Lock nut, 5. Piston, 6. Push rod, 7. Adapter rod, 8. Dust ring, 9. Copper sleeve, 51. Wear-resistant ring, 52. Guide key;

[0040] 121, push rod extension hole, 122, dust ring installation groove, 123, copper sleeve installation groove, 1201, upper boss, 1202, lower boss, 1203, first bolt installation hole, 1204, first bolt installation foot, 1205, weight reduction groove, 1206, positioning notch;

[0041] 141, direct connection seat chamber, 142, R angle groove, 143, second bolt mounting foot, 1431, second bolt mounting hole, 144, threaded hole;

[0042] 131, bearing seat end cover, 1301, screw rod extension hole, 1302, bearing mounting groove, 1303, bearing seat end cover mounting groove. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] like Figure 1 As shown, the utility model provides a novel direct-connected electric cylinder device, including a cylinder body 11, and the front and rear ends of the cylinder body 11 are respectively provided with a front cover 12 and a bearing seat 13, and the bearing seat 13 serves as the rear end cover of the cylinder body. The rear end of the bearing seat 13 is sequentially provided with a direct-connection seat 14, a bottom plate 15 and a motor (omitted in the figure), and the motor is arranged and installed at the rear end of the direct-connection seat 14 through the bottom plate 15. Among them, the bottom plate 15 serves as an adapter plate of the motor, which is fixed to the rear of the direct-connection seat.

[0046] Furthermore, the cylinder body 11 is regularly provided with a coupling 2, a lead screw, a piston 5 and a push rod 6. The piston 5 is used as an intermediate piece between the lead screw and the push rod 6, which are spliced ​​and installed together. The push rod 6 is fixed at the front end of the piston 5 and extends out of the front end cover 12. The lead screw includes a lead screw 41 and a lead screw nut 42, the lead screw nut 42 is fixed at the rear end of the piston 5, the lead screw 41 passes through the lead screw nut 42, and is rotatably connected with the lead screw nut 42 through a plurality of balls.

[0047] Furthermore, the push rod 6 is a tubular push rod with a hollow interior. The front end of the screw rod 41 passes through the piston 5 and is disposed inside the push rod 6; the rear end of the screw rod 41 passes through a plurality of bearings 3 on the bearing seat 13 and is connected to the rotating shaft of the motor through the coupling 2.

[0048] Furthermore, a transfer rod 7 is provided at the front end of the push rod 6 . The transfer rod 7 serves as a transfer rod of the push rod on one hand, and seals the front end of the push rod 6 on the other hand, thereby sealing the front end of the screw rod 41 inside the push rod 6 .

[0049] The working principle or process of a novel direct-connected electric cylinder device of the utility model is as follows:

[0050] The motor drives the screw 41 to rotate through the coupling 2, and the screw nut 42 on the screw 41 converts the rotational motion of the screw into linear motion, thereby driving the piston 5 to make linear motion along the inner wall of the cylinder body 11. Further, the piston 5 drives the push rod 6 at its front end to make linear motion.

[0051] like Figure 2 and Figure 3 As shown, the outer surface of the piston 5 is regularly provided with a plurality of annular notches, and wear-resistant rings 51 are respectively installed thereon, forming a plurality of wear-resistant rings. The middle position of the outer surface of the piston 5 is also regularly provided with a plurality of guide key grooves along its length direction, and guide keys 52 are respectively installed thereon, forming a plurality of guide keys.

[0052] The piston 5 contacts the inner wall of the cylinder 11 through a plurality of wear-resistant rings 51 on its outer surface. By providing a plurality of wear-resistant rings in contact with the inner wall of the cylinder 11, the service life and stability of the product can be effectively improved.

[0053] Among them, the piston 5 cooperates with a number of guide grooves arranged on the inner wall of the cylinder body 11 through a number of guide keys on its outer surface. The guide keys on the piston are installed in the guide grooves on the inner wall of the cylinder body, thereby limiting the transmission direction of the piston, avoiding the position or angle deviation of the piston, and further improving the stability of the piston's linear motion inside the cylinder body 11.

[0054] like Figure 3 As shown, in one embodiment, the plurality of wear-resistant rings 51 on the outer surface of the piston 5 are provided in three groups, which are respectively provided at the upper, middle and lower positions of the outer surface of the piston, thereby forming a first wear-resistant ring 5101, a second wear-resistant ring 5102 and a third wear-resistant ring 5103. The provision of three groups of wear-resistant rings can greatly improve the service life of the entire product, thereby ensuring the stability, performance and precision of the product.

[0055] like Figure 3 As shown, in one embodiment, the plurality of guide keys on the outer surface of the piston 5 are provided in two groups, along the length of the piston ( Figure 3 The two sets of guide keys are arranged front and back in the height direction. The arrangement of the two sets of guide keys can ensure the stability of the piston in the transmission inside the cylinder body 11.

[0056] like Figure 4 and Figure 5 , which is a structural diagram of the front end cover 12.

[0057] like Figure 4 As shown, the front cover 12 is provided with a push rod extension hole 121 through the top and bottom for convenient extension of the push rod 6. Further, the upper end of the push rod extension hole 121 is provided with a dust ring installation groove 122, and a dust ring 8 is installed in cooperation, and the lower end of the push rod extension hole 121 is provided with a copper sleeve installation groove 123, and a copper sleeve 9 for lubrication, shock absorption and support is installed in cooperation. The push rod 6 extends out of the front cover from the push rod extension hole 121, passes through the copper sleeve 9 in the copper sleeve installation groove and the dust ring 8 in the dust ring installation groove in sequence, and is in sealing contact with them.

[0058] Among them, the dust ring 8 at the front end of the front cover 12 can effectively prevent the dust in the external environment from being adsorbed on the push rod during the reciprocating linear motion of the push rod, and being brought into the cylinder body by the push rod, polluting the internal environment of the cylinder body, and causing the performance of the product to be weakened. The copper sleeve 9 at the rear end of the front cover 12 can effectively prevent the oil body inside the cylinder body from leaking out during the reciprocating linear motion of the push rod, causing the performance of the product to be weakened, and causing pollution problems to the external environment. Therefore, the dust ring 8 and copper sleeve 9 respectively set at the front and rear ends of the front cover can effectively prevent dust in the external environment from entering the cylinder body, and can also effectively prevent the oil body inside the cylinder body from leaking out.

[0059] Further, such as Figure 4 As shown, the upper and lower ends of the end cover 12 are respectively raised to form an upper boss 1201 and a lower boss 1202. The upper boss 1201 is mainly used for the setting of the dust ring mounting groove 122 and weight reduction treatment. The natural protrusion of the upper boss can effectively reduce the weight and volume of the front end cover 12. The lower boss 1202 is used to be inserted into the upper end of the cylinder body 11 and fit and seal with the inner wall of the upper end of the cylinder body.

[0060] Further, such as Figure 5 As shown, the front end cover 12 is regularly provided with first bolt mounting holes 1203 at the four corners thereof, and the first bolt mounting holes 1203 are bolt mounting holes with steps. Correspondingly, the upper four corners of the cylinder body 11 are provided with threaded holes that cooperate with the first bolt mounting holes 1203.

[0061] Furthermore, in order to further reduce the weight of the front end cover 12 while ensuring the overall structural strength of the front end cover, weight reduction grooves 1205 with upper ends open are regularly arranged on the front, rear, left, and right four surfaces of the front end cover 12. The weight reduction grooves 1205 are naturally concave along the middle parts of the front, rear, left, and right four surfaces of the front end cover, and are designed along the upper end opening of the front end cover, thereby forming a Figure 5 The weight-reducing groove 1205 is shown to be open at the upper end.

[0062] Furthermore, the weight-reducing groove 1205 is designed to avoid the first bolt mounting hole 1203 , so that a first bolt mounting foot 1204 in a cylindrical shape is naturally formed at the four corners of the front end cover 12 .

[0063] In order to ensure the service life and stability of the electric cylinder device in the utility model, the front end cover 12 is made of metal. Although the metal material can improve its service life and stability, it is relatively heavy. Figure 5 As shown, the utility model can effectively reduce the weight of the front end cover and thus reduce the overall weight of the electric cylinder through the design of the upper boss 1201 and the weight reduction grooves 1205 on the front, back, left and right sides.

[0064] Furthermore, the lower ends of the front cover 12 are respectively foolproofed at the front and rear and left and right sides. The front and rear sides of the front cover 12 are regularly provided with a plurality of positioning notches 1206 at the slot positions of the front and rear sides of the cylinder body 11, so as to distinguish the left and right sides thereof, which is convenient for the early assembly work on the one hand, and integrally formed with the cylinder body after being spliced ​​on the other hand, reducing the abruptness and making it more beautiful.

[0065] like Figure 6 and Figure 7 , which is a structural diagram of the direct connection seat 14. The direct connection seat 14 connects the bearing seat 13 and the bottom plate 15, so that the motor is arranged at the rear end of the cylinder body 11, forming the direct connection electric cylinder device of the utility model.

[0066] like Figure 6 As shown, a direct connection seat chamber 141 is provided through the upper and lower ends of the direct connection seat 14, and the coupling 2 at the rear end of the screw rod 41 is placed in the direct connection seat chamber 141, so as to be connected with the rotating shaft of the motor through the coupling 2.

[0067] Furthermore, the four corners of the direct connection seat 14 are respectively provided with R angle grooves 142 of a certain depth, and the R angle grooves 142 are fan-shaped and are cut upward from the bottom end of the direct connection seat 14 according to a certain depth. Figure 6 As shown, second bolt mounting feet 143 are naturally formed at the four corners of the upper end of the direct connection seat 14, and second bolt mounting holes 1431 for the screw rod of the bolt to pass through are regularly opened on the second bolt mounting feet 143.

[0068] Further, such as Figure 7 As shown, in order to facilitate the fixing of the bottom plate 15 and the bottom end of the direct connection seat 14 together, the bottom end of the direct connection seat 14 is regularly provided with threaded holes 144 .

[0069] like Figure 7 As shown, the design of the R angle groove 142 can not only reduce the weight of the direct connection seat, but also facilitate the fixing of the bottom plate 15 and the motor. Through holes are provided at the four corners of the bottom plate 15 for the screw rods of the bolts to pass through, so that the fixing holes at the four corners of the bottom plate 15 and the motor are connected by bolts.

[0070] At the same time, the design of the R angle groove also facilitates the assembly and maintenance of the direct-connected electric cylinder device of the utility model. Figure 1 and Figure 7 As shown, the cylinder body 11, the bearing seat 13 and the direct connection seat 14 are fixedly connected to each other by bolts, and the screw rod of the bolt passes through the direct connection seat, the bearing seat and the threaded hole at the bottom of the cylinder body from the bottom of the direct connection seat 14 to lock and fix them together. The bottom plate 15 is bolted to the threaded hole 144 at the bottom of the direct connection seat to lock and fix them together. Therefore, the four corners of the bottom plate 15 are in the R angle groove, forming a certain bolt assembly space, thereby facilitating the assembly and subsequent maintenance of the utility model.

[0071] like Figure 8 , which is a structural diagram of the bearing seat 13. In the present invention, the bearing seat 13 is through-set from top to bottom to form a screw rod extension hole 1301. Furthermore, a bearing installation groove 1302 is regularly set at the upper end of the screw rod extension hole 1301, and the aperture of the bearing installation groove 1302 is larger than the aperture of the screw rod extension hole 1301, so that a plurality of ball bearings can be placed and installed in the bearing installation groove 1302.

[0072] Further, such as Figure 8 As shown, in the present invention, a plurality of ball bearings are installed in the bearing mounting groove 1302 inside the bearing seat 13, and the plurality of ball bearings are pressed by the bearing seat end cover 131, and the upper end of the bearing seat 13 is covered, thereby fixing the plurality of ball bearings inside the bearing seat 13.

[0073] Therefore, further, a bearing seat end cover mounting groove 1303 is regularly arranged at the upper end of the bearing seat 13 , and the aperture of the bearing seat end cover mounting groove 1303 is larger than the aperture of the bearing mounting groove 1302 .

[0074] like Figure 8As shown, the upper and lower ends of the bearing seat end cover 131 are also respectively provided with an upper boss and a lower boss, wherein the upper boss is inserted into the lower end of the cylinder body 11 and is sealed against the inner wall of the lower end of the cylinder body; the lower boss is inserted into the bearing mounting groove 1302 to compress a plurality of ball bearings in the bearing mounting groove and is sealed against the inner wall of the bearing mounting groove 1302.

[0075] Furthermore, the lower end of the bearing seat 13 is also provided with a lower boss of the bearing seat, and correspondingly, the upper end of the direct-connection seat 14 is provided with a slot hole for convenient insertion and installation of the lower boss of the bearing seat.

[0076] like Figure 1 and Figure 2 As shown, in order to limit the forward push stroke of the lead screw nut or push rod, the front end of the lead screw is provided with a limit nut 43. In order to lock the lead screw and the bearing, a locking nut 44 is also provided at the rear end of the lead screw and the bearing connection.

[0077] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel direct-connected electric cylinder device, comprising a cylinder body, a lead screw, a push rod, a coupling and a motor, characterized in that: The front and rear ends of the cylinder body are respectively provided with a front end cover and a bearing seat, the bearing seat serving as the rear end cover of the cylinder body and cooperating with the front end cover to seal the internal environment of the cylinder body; A plurality of bearings are regularly arranged inside the bearing seat, and a direct connection seat, a bottom plate and the motor are sequentially arranged at the rear end thereof, and the motor is fixed to the rear of the direct connection seat through the bottom plate; The lead screw is connected to the push rod through a piston, and the piston serves as an intermediate piece between the lead screw and the push rod, which are spliced ​​and installed together. The lead screw includes a lead screw and a lead screw nut. The push rod is tubular and fixed to the front end of the piston and extends out of the front end cover. The push rod is in sealing contact with the front end cover. The lead screw nut is fixed to the rear end of the piston. The front end of the lead screw passes through the lead screw nut and the piston and is arranged inside the tubular push rod. The rear end of the lead screw passes through the bearing seat and the several bearings inside the bearing seat. The rear end of the lead screw is connected to the rotating shaft of the motor through the coupling, and the coupling is arranged in the internal chamber of the direct connection seat. The outer surface of the piston is regularly provided with a number of annular notches, and wear-resistant rings are respectively installed thereon to form a number of wear-resistant rings; a number of guide key grooves are also regularly provided at the middle position of its outer surface along its length direction, and guide keys are respectively installed thereon to form a number of guide keys; the piston contacts the inner wall of the cylinder body through the several wear-resistant rings on its outer surface, and the piston cooperates with the several guide grooves arranged on the inner wall of the cylinder body through the several guide keys on its outer surface to limit and stabilize the transmission path of the piston.

2. A novel direct-connected electric cylinder device as claimed in claim 1, characterized in that: The front end cover is penetrated from top to bottom and is provided with a push rod extension hole for facilitating the extension of the push rod. The upper end of the push rod extension hole is provided with a dust ring installation groove, and a dust ring is installed in cooperation with it. The lower end of the push rod extension hole is provided with a copper sleeve installation groove, and a copper sleeve is installed in cooperation with it. The push rod extends out of the front end cover from the push rod extension hole and contacts with the inner wall. The push rod passes through the copper sleeve and the dust ring in turn and contacts with them in a sealing manner.

3. A novel direct-connected electric cylinder device as claimed in claim 2, characterized in that: The front end cover has four surfaces, front, back, left, and right, regularly provided with weight-reducing grooves with upper openings. The weight-reducing grooves with upper openings are recessed inwardly along the middle parts of the front end cover and are designed along the upper opening of the front end cover.

4. A novel direct-connected electric cylinder device as claimed in claim 3, characterized in that: A plurality of positioning notches are regularly arranged at the lower ends of the front and rear surfaces or left and right surfaces of the front cover at the slot positions on the front and rear surfaces or left and right surfaces of the cylinder body to achieve rapid positioning and assembly of the front cover and the cylinder body.

5. A novel direct-connected electric cylinder device as claimed in claim 2, characterized in that: Bolt mounting holes with steps are regularly arranged at the four corners of the front end cover.

6. A novel direct-connected electric cylinder device as claimed in claim 1, characterized in that: The direct connection seat is provided with a direct connection seat chamber extending upward and downward, and the coupling at the rear end of the screw rod is placed in the direct connection seat chamber.

7. A novel direct-connected electric cylinder device as claimed in claim 6, characterized in that: The four corners of the direct connection seat are respectively provided with R-angle grooves of a certain depth, and the R-angle grooves are fan-shaped grooves, which are cut upward at a certain depth starting from the bottom end of the direct connection seat; the four corners of the direct connection seat are at the top of the R-angle grooves to form bolt mounting feet, and bolt mounting through holes are opened to facilitate the passage of bolts.

8. A novel direct-connected electric cylinder device as claimed in claim 1, characterized in that: The bearing seat is provided with a screw rod extension hole through the upper and lower parts, and a bearing installation groove is regularly provided at the upper end of the screw rod extension hole, the aperture of the bearing installation groove is larger than the aperture of the screw rod extension hole, and the plurality of bearings are installed in the bearing installation groove; the upper end of the bearing installation groove is regularly provided with a bearing seat end cover installation groove, and a bearing seat end cover is installed, and the upper and lower ends of the bearing seat end cover are respectively provided with an upper boss and a lower boss, the upper boss of the bearing seat end cover is snapped into the lower end of the cylinder body and fits and seals with the inner wall of the lower end of the cylinder body, the lower boss of the bearing seat end cover is snapped into the bearing installation groove and fits and seals with the inner wall of the bearing installation groove, and the lower boss of the bearing seat end cover presses the plurality of bearings in the bearing installation groove.

9. A novel direct-connected electric cylinder device as claimed in claim 8, characterized in that: The lower end of the bearing seat is also provided with a lower boss of the bearing seat, and the upper end of the direct connection seat is regularly provided with slot holes for facilitating the insertion and sealing installation of the lower boss of the bearing seat.

10. A novel direct-connected electric cylinder device as claimed in claim 1, characterized in that: A transfer rod is provided at the front end of the push rod, and the rear end of the transfer rod is sealed and connected with the front end of the push rod, so as to seal the front end of the screw rod inside the push rod.

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