Double-outlet-rod electric cylinder

Abstract

The utility model discloses a double-ejection-rod electric cylinder, and aims to provide a double-ejection-rod electric cylinder which can simplify the structure, reduce the manufacturing cost and improve the production efficiency. And the overall size of the electric cylinder can be reduced under the condition that the stroke is not reduced. The device comprises a gear box which is provided with a motor; the long nut is rotationally arranged in the gearbox through a first bearing, and a rotating shaft of the long nut is perpendicular to an output shaft of the motor; an output shaft of the motor is in transmission connection with the long nut through the bevel gear transmission mechanism; the lead screw shaft is matched with the long nut to form a lead screw nut mechanism, and the two ends of the lead screw shaft extend to the outer side of the gearbox; the two guide sleeves are arranged on the gear box, the long nut is located between the two guide sleeves, one end of the lead screw shaft penetrates through one guide sleeve, and the other end of the lead screw shaft penetrates through the other guide sleeve.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric cylinder technical field, concretely relates to a double -out -bar electric cylinder. BACKGROUND

[0002] Electric cylinder is the modular product of the integrated design of servo motor and screw rod mechanism, converts the rotary motion of servo motor into the linear motion of screw rod, and realizes the accurate control of the position, speed and thrust of electric cylinder output shaft according to the characteristics that servo motor can be accurately controlled, is the product of high-precision linear motion.

[0003] At present, the existing double-out-bar electric cylinder is still based on the principle of conventional electric cylinder and is realized by using two ball screws to drive the piston rod to go in and out, and the existing structure of double-out-bar electric cylinder has the problems of too many parts, complex assembly and high manufacturing cost. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a double-out-bar electric cylinder which can not only simplify the structure, reduce the manufacturing cost and improve the production efficiency, but also reduce the overall size of the electric cylinder without reducing the stroke.

[0005] The technical scheme of the utility model is:

[0006] A double-out-bar electric cylinder comprises:

[0007] A gear box is provided with a motor;

[0008] A long nut is rotatably arranged in the gear box through a first bearing, and the rotation axis of the long nut is perpendicular to the output shaft of the motor;

[0009] A bevel gear transmission mechanism is arranged between the output shaft of the motor and the long nut;

[0010] A screw rod shaft is arranged in cooperation with the long nut to form a screw nut mechanism, and the two ends of the screw rod shaft extend to the outside of the gear box;

[0011] Two guide sleeves are arranged on the gear box, the long nut is located between the two guide sleeves, one end of the screw rod shaft passes through one of the guide sleeves, and the other end of the screw rod shaft passes through the other guide sleeve.

[0012] The two ends of the screw shaft are connected with the elements to be driven respectively (after the two ends of the screw shaft are connected with the elements to be driven respectively, the screw shaft cannot rotate), the motor drives the long nut to rotate through the bevel gear transmission mechanism, and then drives the screw shaft to move linearly, thereby driving the elements at the two ends of the screw shaft to move synchronously. Compared with the existing double-rod electric cylinder based on the principle of the conventional electric cylinder, which uses two ball screws to drive the piston rod to move in and out to realize, there are many parts, complex assembly, high manufacturing cost; the double-rod electric cylinder of the scheme adopts a bevel gear transmission mechanism, the output shaft of the motor and the rotating shaft of the long nut are distributed at 90°, and the long nut drives the same screw shaft to move to realize the double-rod, which has compact structure, can effectively reduce the parts, simplify the structure and assembly, reduce the manufacturing cost, and improve the production efficiency; at the same time, without reducing the stroke, the overall size of the electric cylinder can be reduced, so as to better adapt to the installation and use in narrow space.

[0013] As preferred, the gear box comprises a box body and two left and right cylinders, the box body is located between the two left and right cylinders, one end of the cylinder is connected to the box body by a bolt, the bevel gear transmission mechanism is located in the inner cavity of the box body, the guide sleeve is correspondingly arranged at the other end of the two cylinders, and the screw shaft passes through the two cylinders. The arrangement of the cylinder and the guide sleeve not only improves the moving stability of the screw shaft, but also blocks external impurities from entering the gear box, thereby improving the protection level of the electric cylinder.

[0014] As preferred, the box body is provided with two bearing mounting holes corresponding to the cylinders, each bearing mounting hole is provided with the first bearing, the long nut is rotatably arranged in the gear box through the first bearings in the two bearing mounting holes, the outer wall of the long nut is provided with two left and right limiting steps, the two limiting steps are located between the first bearings in the two bearing mounting holes, the first bearings in the two bearing mounting holes are located between the two cylinders, the inner ring of the first bearing abuts against the corresponding limiting step, and the outer ring of the first bearing abuts against the end face of the corresponding cylinder. The first bearing is limited in the corresponding bearing mounting hole through the cooperation of the two cylinders and the two limiting steps on the outer wall of the long nut, and then the long nut is installed in the gear box, so as to prevent the axial and radial movement of the long nut; in this way, the stability of the long nut can be guaranteed, and the installation of the long nut can be completed synchronously after the cylinder is connected to the box body by a bolt, so that the installation operation is convenient.

[0015] As preferred, the guide sleeve is connected to the other end of the corresponding cylinder through a thread, and a sealing ring is arranged between the guide sleeve and the cylinder. In this way, the connection and installation of the guide sleeve and the cylinder are facilitated. In addition, the sealing performance is improved by arranging the sealing ring between the guide sleeve and the cylinder.

[0016] As preferred, the box side wall is provided with a mounting opening and a box mounting hole, the mounting opening and the box mounting hole are located at opposite sides of the box and are in communication with the inner cavity of the box, the mounting opening is sealed by a detachable end cover, the bevel gear transmission mechanism comprises a driving bevel gear and a driven bevel gear, the driving bevel gear is rotatably arranged in the box mounting hole through a second bearing, the driven bevel gear is provided with a gear hole, and a long nut is inserted in the gear hole and connected with the gear hole through a key.

[0017] When the driven bevel gear is installed, it is put into the inner cavity of the box through the mounting opening; then the driven bevel gear is connected with the long nut in the inner cavity of the box; when the driving bevel gear is installed, the driving bevel gear and the second bearing are installed through the box mounting hole, so that the driving bevel gear is engaged with the driven bevel gear. In this way, the volume of the gear box can be further reduced without affecting the installation of the driving bevel gear and the driven bevel gear.

[0018] As preferred, the driving bevel gear comprises a gear shaft, the gear shaft is provided with a shaft shoulder and a shaft retainer, the box mounting hole is provided with a hole retainer and a positioning step, the second bearing is located in the box mounting hole, the inner ring of the second bearing is located between the shaft shoulder and the shaft retainer, and the outer ring of the second bearing is located between the hole retainer and the positioning step. When the driving bevel gear is installed, the driving bevel gear is put into the inner cavity of the box through the box mounting hole, then the second bearing is installed in the box mounting hole, and then the shaft retainer and the hole retainer are installed, so that the installation of the driving bevel gear is completed and the driving bevel gear is engaged with the driven bevel gear. In this way, the installation of the driving bevel gear is facilitated and the stability of the installation of the driving bevel gear is ensured.

[0019] As preferred, the gear shaft end face is provided with a shaft hole, the motor is located outside the gear box, the motor is installed on the box side wall where the box mounting hole is located through bolts, the output shaft of the motor extends into the shaft hole, and the output shaft of the motor and the shaft hole are connected through a key. In this way, when the motor needs to be replaced, the old motor can be directly disassembled; then the output shaft of the replaced motor is extended into the shaft hole, the output shaft of the motor and the shaft hole are connected through a key, and then the motor is installed on the box through bolts; without disassembling the gear box and the driving bevel gear and other parts, the installation and disassembly of the motor are facilitated.

[0020] As preferred, the left and right two cylinders are symmetrically distributed on both sides of the box, and the two guide sleeves are also symmetrically distributed on both sides of the box. In this way, the left and right two cylinders can be universal, and only the same size and model of cylinder needs to be machined when the cylinder is made, which can reduce the cost of cylinder manufacturing; similarly, the two guide sleeves can be universal, and only the same size and model of guide sleeve needs to be made when the guide sleeve is made, which can reduce the cost of cylinder manufacturing.

[0021] As preferred, the both ends of the screw shaft are provided with end connection structures, and the end connection structures are screw rods or light rods or flanges.

[0022] As preferred, the bevel gear transmission mechanism comprises a driving bevel gear and a driven bevel gear, the driving bevel gear is connected with the output shaft of the motor, the driven bevel gear is provided with a gear hole, the long nut is inserted in the gear hole, the flat key is integrated on the outer wall of the long nut, and the long nut and the gear hole are connected through the flat key. The flat key integrated on the outer wall of the long nut reduces the number of parts, improves the production efficiency, reduces the cost, and enhances the part strength.

[0023] The electric cylinder has the advantages that the structure is simplified, the manufacturing cost is reduced, and the production efficiency is improved; and the overall size of the electric cylinder is reduced without reducing the stroke. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a three-dimensional structure schematic view of a double-out-rod electric cylinder.

[0025] Figure 2 is a cross-sectional structure schematic view of a double-out-rod electric cylinder.

[0026] In the drawings:

[0027] Gear box 1, box 1.1, cylinder 1.2, end cover 1.3, box mounting hole 1.4;

[0028] Motor 2;

[0029] Lead screw shaft 3, end connection structure 3.1;

[0030] Guide sleeve 4;

[0031] Long nut 5, limiting step 5.1;

[0032] Bevel gear transmission mechanism 6, driving bevel gear 6.1, driven bevel gear 6.2, gear shaft 6.3;

[0033] First bearing 7;

[0034] Second bearing 8;

[0035] Hole check ring 9;

[0036] Shaft check ring 10. DETAILED DESCRIPTION

[0037] Specific embodiment one, as shown in Figure 1 , Figure 2 A double-out-rod electric cylinder, comprising a gear box 1, a motor 2, a long nut 5, a bevel gear transmission mechanism 6, a lead screw shaft 3 and two guide sleeves 4.

[0038] The motor 2 is mounted on the gear box 1 and is located outside the gear box 1. Two guide sleeves 4 are arranged on the gear box 1 and are distributed on opposite sides of the gear box 1.

[0039] The long nut 5 is arranged in the gear box 1 through the first bearing 7 and rotates. The rotation axis of the long nut 5 is perpendicular to the output shaft of the motor 2. The long nut 5 is located between the two guide sleeves 4.

[0040] The bevel gear transmission mechanism 6 is arranged in the gear box 1. The output shaft of the motor 2 and the long nut 5 are connected through the bevel gear transmission mechanism 6. In the embodiment, the bevel gear transmission mechanism 6 includes a driving bevel gear 6.1 and a driven bevel gear 6.2. The output shaft of the motor 2 is connected with the driving bevel gear 6.1, and the driven bevel gear 6.2 is arranged on the long nut 5.

[0041] The lead screw shaft 3 penetrates through the long nut 5. The lead screw shaft 3 cooperates with the long nut 5 to form a lead screw nut mechanism. The lead screw nut mechanism is a sliding lead screw nut mechanism or a ball screw nut mechanism. Both ends of the lead screw shaft 3 extend to the outside of the gear box 1. One end of the lead screw shaft 3 penetrates through one of the guide sleeves 4, and the other end of the lead screw shaft 3 penetrates through the other guide sleeve 4.

[0042] The specific work of the double-rod electric cylinder in the embodiment is as follows,

[0043] The two ends of the lead screw shaft 3 are connected with the elements to be driven respectively (after the two ends of the lead screw shaft 3 are connected with the elements to be driven respectively, the lead screw shaft 3 cannot rotate), the motor 2 drives the long nut 5 to rotate through the bevel gear transmission mechanism 6, and then drives the lead screw shaft 3 to move linearly, thereby driving the elements at the two ends of the lead screw shaft 3 to move synchronously. Compared with the existing double-rod electric cylinder which uses two ball screws to drive the piston rod to move in and out based on the principle of a conventional electric cylinder, the double-rod electric cylinder of the present scheme adopts the bevel gear transmission mechanism 6 to drive, the output shaft of the motor 2 and the rotation axis of the long nut 5 are distributed at 90°, and the long nut 5 drives the same lead screw shaft 3 to move to realize the double-rod, which has a compact structure, can effectively reduce the parts, simplify the structure and assembly, reduce the manufacturing cost, and improve the production efficiency; at the same time, the overall size of the electric cylinder can be reduced without reducing the stroke, so as to better adapt to the installation and use in a narrow space.

[0044] Specific embodiment two, as shown in Figure 1 , Figure 2 A double-rod electric cylinder includes a gear box 1, a motor 2, a long nut 5, a bevel gear transmission mechanism 6, a lead screw shaft 3, and two guide sleeves 4.

[0045] The motor 2 is mounted on the gear box 1 and is located outside the gear box 1. Two guide sleeves 4 are arranged on the gear box 1 and are distributed on opposite sides of the gear box 1.

[0046] The long nut 5 is arranged in the gear box 1 through the first bearing 7 and rotates. The rotation axis of the long nut 5 is perpendicular to the output shaft of the motor 2. The long nut 5 is located between the two guide sleeves 4.

[0047] The bevel gear transmission mechanism 6 is arranged in the gear box 1. The output shaft of the motor 2 and the long nut 5 are connected through the bevel gear transmission mechanism 6. In this embodiment, the bevel gear transmission mechanism 6 includes a driving bevel gear 6.1 and a driven bevel gear 6.2. The output shaft of the motor 2 is connected with the driving bevel gear 6.1, and the driven bevel gear 6.2 is arranged on the long nut 5.

[0048] The screw shaft 3 penetrates through the long nut 5. The screw shaft 3 and the long nut 5 cooperate to form a screw nut mechanism. The screw nut mechanism can be a sliding screw nut mechanism or a ball screw nut mechanism. In this embodiment, the screw nut mechanism is a single ball screw nut mechanism, which is beneficial to reduce the overall size of the electric cylinder.

[0049] Both ends of the screw shaft 3 extend to the outside of the gear box 1. One end of the screw shaft 3 penetrates through one of the guide sleeves 4, and the other end of the screw shaft 3 penetrates through the other guide sleeve 4.

[0050] Specifically, the gear box 1 includes a box body 1.1 and two left and right cylinder barrels 1.2. The box body 1.1 is located between the two left and right cylinder barrels 1.2. One end of the cylinder barrel 1.2 is connected to the box body 1.1 by bolts. The bevel gear transmission mechanism 6 is located in the inner cavity of the box body 1.1. The guide sleeves 4 are arranged in the other ends of the two cylinder barrels 1.2 one by one. The screw shaft 3 penetrates through the two cylinder barrels 1.2. The arrangement of the cylinder barrel 1.2 and the guide sleeve 4 not only improves the movement stability of the screw shaft 3, but also blocks external impurities from entering the gear box 1, thereby improving the protection level of the electric cylinder.

[0051] In this embodiment, the two left and right cylinder barrels 1.2 are symmetrically distributed on both sides of the box body 1.1, and the two guide sleeves 4 are also symmetrically distributed on both sides of the box body 1.1. In this way, the two left and right cylinder barrels 1.2 can be universal, and only the same size and model of the cylinder barrel 1.2 needs to be processed when the cylinder barrel 1.2 is manufactured, which can reduce the manufacturing cost of the cylinder barrel 1.2. Similarly, the two guide sleeves 4 can be universal, and only the same size and model of the guide sleeve 4 needs to be manufactured when the guide sleeve 4 is manufactured, which can reduce the manufacturing cost of the cylinder barrel 1.2.

[0052] Of course, it should be noted that the two left and right cylinder barrels 1.2 can also be asymmetrically distributed, and the two guide sleeves 4 can also be asymmetrically distributed.

[0053] The long nut 5 is rotatably arranged in the gear hole of the driven bevel gear 6.2. The long nut 5 is connected with the gear hole of the driven bevel gear 6.2 through a key. Specifically, the long nut 5 is integrated with a flat key on the outer wall, and the gear hole of the driven bevel gear 6.2 is provided with a key groove on the inner wall, which penetrates through both ends of the gear hole of the driven bevel gear 6.2. The long nut 5 is connected with the gear hole of the driven bevel gear 6.2 through the flat key. The long nut 5 is integrated with a flat key on the outer wall, which reduces the number of parts, improves production efficiency, thereby reducing costs, and also enhances the strength of the part. Of course, it should be noted that the long nut 5 is connected with the gear hole of the driven bevel gear 6.2 through a key, and the key of the key connection structure and the long nut 5 can also be separately manufactured.

[0054] Further, as shown in Figure 2 The box body 1.1 is provided with two bearing mounting holes corresponding to the cylinder barrels 1.2, and each bearing mounting hole is provided with the first bearing 7. The long nut 5 is rotatably arranged in the gear box 1 through the first bearing 7 in the two bearing mounting holes. The outer wall of the long nut 5 is provided with two limiting steps 5.1, and the two limiting steps 5.1 are symmetrically distributed in the embodiment. The two limiting steps 5.1 are located between the first bearings 7 in the two bearing mounting holes. The first bearings 7 in the two bearing mounting holes are located between the two cylinder barrels 1.2. The inner ring of the first bearing 7 abuts against the corresponding limiting step 5.1. The outer ring of the first bearing 7 abuts against the end face of the corresponding cylinder barrel 1.2. The two cylinder barrels 1.2 and the two limiting steps 5.1 on the outer wall of the long nut 5 cooperate to limit the first bearing 7 in the corresponding bearing mounting hole, and then the long nut 5 is installed in the gear box 1, preventing the axial and radial movement of the long nut 5; in this way, not only the stability of the long nut 5 can be guaranteed, but also the installation of the long nut 5 can be completed synchronously after the cylinder barrel 1.2 is connected to the box body 1.1 through bolts, which is convenient to operate.

[0055] Further, as shown in Figure 2As shown, the side wall of the box 1.1 is provided with an installation opening and a box mounting hole 1.4, the installation opening and the box mounting hole 1.4 are located on opposite sides of the box 1.1, and the installation opening and the box mounting hole 1.4 are in communication with the inner cavity of the box 1.1. The installation opening is sealed by a detachable end cover 1.3. In this embodiment, the end cover 1.3 is connected to the box 1.1 by bolts, and a sealing ring is arranged between the end cover 1.3 and the box 1.1. The driving bevel gear 6.1 is rotatably arranged in the box mounting hole 1.4 through the second bearing 8. When the driven bevel gear 6.2 is installed, it is put into the inner cavity of the box 1.1 through the installation opening; then the driven bevel gear 6.2 is connected with the long nut 5 in the inner cavity of the box 1.1; when the driving bevel gear 6.1 is installed, the driving bevel gear 6.1 and the second bearing 8 are installed through the box mounting hole 1.4, so that the driving bevel gear 6.1 is engaged with the driven bevel gear 6.2. In this way, the size of the gear box 1 can be further reduced without affecting the installation of the driving bevel gear 6.1 and the driven bevel gear 6.2.

[0056] Further, as shown in Figure 2 The driving bevel gear 6.1 includes a gear shaft 6.3. In this embodiment, the driving bevel gear 6.1 and the gear shaft 6.3 are integrally formed. The gear shaft 6.3 is provided with a shaft shoulder and a shaft retainer 10. The box mounting hole 1.4 is provided with a hole retainer 9 and a positioning step. The second bearing 8 is located in the box mounting hole 1.4. The inner ring of the second bearing 8 is located between the shaft shoulder and the shaft retainer 10, and the outer ring of the second bearing 8 is located between the hole retainer 9 and the positioning step. When the driving bevel gear 6.1 is installed, the driving bevel gear 6.1 is put into the inner cavity of the box 1.1 through the box mounting hole 1.4, then the second bearing 8 is installed in the box mounting hole 1.4, and then the shaft retainer 10 and the hole retainer 9 are installed, thereby completing the installation of the driving bevel gear 6.1, so that the driving bevel gear 6.1 is engaged with the driven bevel gear 6.2. In this way, the installation of the driving bevel gear 6.1 is facilitated, and the stability of the installation of the driving bevel gear 6.1 is ensured.

[0057] In one embodiment of the present embodiment, as shown in Figure 2 The end face of the gear shaft 6.3 is provided with a shaft hole. The motor 2 is located outside the gear box 1, and the motor 2 is installed on the side wall of the box 1.1 where the box mounting hole 1.4 is located by bolts. The output shaft of the motor 2 extends into the shaft hole, and the output shaft of the motor 2 is connected to the shaft hole through a key. In this way, when the motor 2 needs to be replaced, the old motor 2 can be directly disassembled; then the output shaft of the replaced motor 2 is extended into the shaft hole, and the output shaft of the motor 2 is connected to the shaft hole through a key, and then the motor 2 is installed on the box 1.1 by bolts; without disassembling the gear box 1 and the driving bevel gear 6.1 and other parts, the installation and disassembly of the motor 2 are facilitated.

[0058] In another embodiment of the present embodiment, the gear shaft 6.3 is connected with the output shaft of the motor 2 through a shaft coupling.

[0059] Further, as shown in Figure 2 the guide sleeve 4 is connected in the other end of the corresponding cylinder 1.2 through a threaded connection, that is, the guide sleeve 4 is provided with external threads, and the other end of the cylinder 1.2 is provided with internal threads, and the guide sleeve 4 is connected with the internal threads in the other end of the cylinder 1.2 through the external threads. A sealing ring is provided between the guide sleeve 4 and the cylinder 1.2. In this way, the connection and installation of the guide sleeve 4 and the cylinder 1.2 are facilitated. In addition, the sealing performance is also improved by providing a sealing ring between the guide sleeve 4 and the cylinder 1.2. Of course, it should be noted that the guide sleeve 4 can also be welded in the other end of the corresponding cylinder 1.2, or the guide sleeve 4 can also be connected in the other end of the corresponding cylinder 1.2 through bolts.

[0060] Further, both ends of the lead screw shaft 3 are provided with end connection structures 3.1.

[0061] In one example, the end connection structure 3.1 is a screw. Both ends of the lead screw shaft 3 are connected with the elements to be driven through the screw.

[0062] In another example, the end connection structure 3.1 is a flange. Both ends of the lead screw shaft 3 are connected with the elements to be driven through the flange.

[0063] In a third example, the end connection structure 3.1 is a light pole. Both ends of the lead screw shaft 3 are connected with the elements to be driven through the light pole.

[0064] Of course, the end connection structure can also be other connection structures in the prior art.

[0065] The specific work of a double-rod electric cylinder of the present embodiment is as follows,

[0066] Both ends of the lead screw shaft 3 are connected with the elements to be driven (after both ends of the lead screw shaft 3 are connected with the elements to be driven, the lead screw shaft 3 cannot rotate), the motor 2 drives the long nut 5 to rotate through the bevel gear transmission mechanism 6, and then drives the lead screw shaft 3 to move linearly, thereby driving the elements at both ends of the lead screw shaft 3 to move synchronously. Compared with the existing double-rod electric cylinder which uses two ball screws to drive the piston rod to move in and out based on the principle of a conventional electric cylinder, the double-rod electric cylinder of the present scheme uses a bevel gear transmission mechanism 6 to drive, the output shaft of the motor 2 and the rotating shaft of the long nut 5 are distributed at 90°, and the long nut 5 drives the same lead screw shaft 3 to move to realize double-rod, which has a compact structure, can effectively reduce parts, simplify structure and assembly, reduce production cost, and improve production efficiency; at the same time, the overall size of the electric cylinder can be reduced without reducing the stroke, so as to better adapt to the installation and use in a narrow space.

[0067] The above is only a preferred embodiment of the present application, and does not limit the present application. Any simple modification, change, and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical scheme of the present application.

Claims

1. A double-rod electric cylinder, characterized in that it comprises: A gearbox on which a motor is mounted; A long nut is rotatably mounted inside the gearbox via a first bearing, and the rotation axis of the long nut is perpendicular to the output shaft of the motor. A bevel gear transmission mechanism is used to connect the motor's output shaft to the long nut. The lead screw shaft, in conjunction with the long nut, forms a lead screw and nut mechanism, with both ends of the lead screw shaft extending to the outside of the gearbox; Two guide sleeves are set on the gearbox, and a long nut is located between the two guide sleeves. One end of the lead screw shaft passes through one of the guide sleeves, and the other end of the lead screw shaft passes through the other guide sleeve.

2. The double-rod electric cylinder according to claim 1, characterized in that, The gearbox includes a housing and two cylinders, with the housing located between the two cylinders. One end of each cylinder is bolted to the housing. A bevel gear transmission mechanism is located inside the housing. Guide sleeves are correspondingly installed at the other ends of the two cylinders, and a lead screw shaft passes through the two cylinders.

3. A double-rod electric cylinder according to claim 2, characterized in that, The housing has two bearing mounting holes corresponding to the cylinders. Each bearing mounting hole contains a first bearing. The long nut is rotatably mounted in the gearbox through the first bearings in the two bearing mounting holes. The outer wall of the long nut has two limiting steps, which are located between the first bearings in the two bearing mounting holes. The first bearings in the two bearing mounting holes are located between the two cylinders. The inner ring of the first bearing abuts against the corresponding limiting step, and the outer ring of the first bearing abuts against the end face of the corresponding cylinder.

4. A double-rod electric cylinder according to claim 2 or 3, characterized in that, The guide sleeve is threadedly connected to the other end of the corresponding cylinder, and a sealing ring is provided between the guide sleeve and the cylinder.

5. A double-rod electric cylinder according to claim 2 or 3, characterized in that, The side wall of the housing is provided with an installation opening and a housing mounting hole. The installation opening and the housing mounting hole are located on opposite sides of the housing and are connected to the inner cavity of the housing. The installation opening is sealed by a detachable end cover. The bevel gear transmission mechanism includes a driving bevel gear and a driven bevel gear. The driving bevel gear is rotatably mounted in the housing mounting hole through a second bearing. The driven bevel gear is provided with a gear hole. A long nut is inserted into the gear hole. The long nut and the gear hole are connected by a key.

6. A double-rod electric cylinder according to claim 5, characterized in that, The driving bevel gear includes a gear shaft with a shoulder and a retaining ring on it. A retaining ring and a positioning step are provided in the mounting hole of the housing. The second bearing is located in the mounting hole of the housing. The inner ring of the second bearing is located between the shoulder and the retaining ring, and the outer ring of the second bearing is located between the retaining ring and the positioning step.

7. A double-rod electric cylinder according to claim 5, characterized in that, The gear shaft end face is provided with a shaft hole, the motor is located outside the gearbox, the motor is mounted on the side wall of the gearbox where the mounting hole is located by bolts, the output shaft of the motor extends into the shaft hole, and the output shaft of the motor is connected to the shaft hole by a key.

8. A double-rod electric cylinder according to claim 2 or 3, characterized in that, The two cylinders are symmetrically distributed on both sides of the housing, and the two guide sleeves are also symmetrically distributed on both sides of the housing.

9. A double-rod electric cylinder according to claim 1, 2, or 3, characterized in that, Both ends of the lead screw shaft are provided with end connection structures, which are screws, smooth rods, or flanges.

10. A double-rod electric cylinder according to claim 1, 2, or 3, characterized in that, The bevel gear transmission mechanism includes a driving bevel gear and a driven bevel gear. The driving bevel gear is connected to the output shaft of the motor. The driven bevel gear has a gear hole, and a long nut is inserted into the gear hole. A flat key is integrated on the outer wall of the long nut, and the long nut is connected to the gear hole by the flat key.

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