CN207234598U - Electric push rod - Google Patents

Abstract

The utility model discloses an electric push rod, which includes a cylinder, a main nut, a hollow push rod, and a screw. The end of the hollow push rod is screwed into the nut seat of the main nut with an external thread and fixed with screws to form an integral unit and installed in the cylinder. The screw rod is installed in the inner cavity of the main nut and the hollow push rod, and the screw rod and the main nut are threaded together. The screw rod is drivingly connected to the output shaft of the reducer, and the upper and lower ends of the electric push rod are respectively provided with sealing devices. The utility model improves anti-fouling and anti-corrosion or operational stability.

Description

An electric push rod

technical field

The utility model relates to a linear actuator, in particular to an electric push rod.

Background technique

An electric push rod is an electric drive device that converts the rotary motion of an electric motor into the linear reciprocating motion of a push rod. The common electric push rod is a worm gear transmission form: the worm on the motor gear drives the worm wheel to rotate, so that the small screw in the worm wheel moves axially, and the connecting plate drives the limit rod to move axially accordingly, until the required stroke is reached. , by adjusting the limit block and pressing the travel switch to cut off the power, the motor stops running (the positive and negative control is the same). There are certain problems when this kind of electric push rod is used to open and close workpieces, for example: there is insufficient sealing, resulting in unsatisfactory anti-fouling and anti-corrosion effects; In view of this, it is necessary to improve the existing electric push rod.

Utility model content

Aiming at the existing defects of the prior art, the purpose of the utility model is to provide an electric push rod for improving anti-fouling and anti-corrosion or running stability.

In order to solve the above technical problems, the utility model provides an electric push rod, which includes a cylinder, a main nut, a hollow push rod and a screw rod. The whole rear is sealed in the cylinder, the screw is installed in the inner cavity of the main nut and the hollow push rod, and the screw and the main nut are threaded, and the screw is connected with the output shaft of the reducer; the electric push rod The upper end and the lower end are respectively provided with sealing devices.

Compared with the prior art, the electric push rod of the utility model converts the rotary motion into a linear motion through the thread transmission pair, and the opening and closing of the workpiece is driven by the push rod. High performance and long service life; the main components of the equipment adopt a closed structure, so the anti-corrosion and anti-fouling capabilities are strong, and the lubrication effect is good.

Description of drawings

Fig. 1 is the structural diagram of electric push rod of the present utility model;

Fig. 2 is a partially enlarged view of part A in Fig. 1;

FIG. 3 is a partially enlarged view of part B in FIG. 1 .

Detailed ways

In order to facilitate the understanding of the present utility model, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

See Figures 1 to 2 at the same time, wherein: Figure 1 is a structural diagram of the electric push rod (with the motor and reducer omitted); Figure 2 is a partial enlarged view of part A in Figure 1; Figure 3 is a partial enlarged view of part B in Figure 1 Partial zoom-in. The electric push rod is connected to the reducer (not shown in the figure), and the reducer is connected to the motor (not shown in the figure) through a coupling (not shown in the figure). The motor is a single-phase motor or a three-phase motor. When rotating in the reverse direction (specifically, the forward and reverse rotation is controlled by an external reverse switch), the electric push rod is driven to drive the workpiece to reciprocate, which will be further described below.

The utility model optimizes the design of the electric push rod, which is a fully enclosed structure; the reducer is a worm gear reducer or a bevel gear reducer with a hollow shaft, and it is connected with the electric push rod as a threaded auxiliary transmission; the following further details .

As shown in Figures 1 to 3, the electric push rod is composed of cylinder barrel 126, main nut 114, hollow push rod 116 and screw rod 117 and other main components, wherein the main nut 114 and hollow push rod 116 are connected as a whole and sealed The screw rod 117 is installed in the inner cavity of the main nut 114 and the hollow push rod 116, and the screw rod 117 is threadedly matched with the main nut 114, and the screw rod 117 is connected with the output shaft of the reducer. When the screw rod 117 rotates under the drive of the reducer, the main nut 114 and the hollow push rod 116 linearly reciprocate in the cylinder barrel 126 together. Among them, the screw rod 117 and the main nut 114 form a thread transmission pair, which can adopt three types of trapezoidal screw rod, ball screw rod and planetary roller screw rod according to the different opening and closing forces and speeds, which will be further described below.

As shown in Figures 1 to 3, the cylinder 126 is fixed to the frame (not shown in the figure) through a flange, and the frame is provided with a thrust bearing seat 103 above the cylinder to install a thrust spherical roller bearing 107, A thrust bearing cover 140 is installed on the thrust bearing housing 103, and a shoulder retaining ring 135 is installed between the thrust bearing cover 140 and the spherical roller bearing 107, so that the spherical roller bearing 107 is better axially limited; The upper end of the screw rod 117 is supported by the thrust self-aligning roller bearing 107; the screw rod 117 is installed with a load-bearing nut 102 above the supporting part of the thrust spherical roller bearing 107, and the load-bearing nut 102 is locked to the screw rod by a lock nut 134 117, so that the screw rod 117 is suspended from the cylinder 126, thus forming the top supporting device of the electric push rod.

As shown in Figures 1 to 3, the upper end of the screw rod 117 is connected to the drive shaft of the hollow shaft reducer, and the screw rod 117 is positioned with the drive shaft of the reducer through the flat key 101, so that the screw rod 117 can be positioned in the cylinder Rotate in 126; the main nut 114 is integrated with the nut seat 112 through the flat key 113, the nut seat 112 is threaded with the hollow push rod 116 and locked with the locking screw 115, so that the main nut 114 and the hollow push rod 116 become a whole , the hollow push rod 116 and the main nut 114 are placed in the cylinder barrel 126, and the screw rod 117 is placed in the hollow push rod 116 and the main nut 114. When the screw rod 117 rotates, the main nut 114 and the hollow push rod 116 can be placed in the cylinder barrel Do linear reciprocating motion between 126 inner walls; thus, the movement of main nut 114 and hollow push rod can drive the hanger (not shown) that hollow push rod 116 lower end protruding part is connected, finally can drive workpiece motion.

As shown in Figures 1 to 3, the lower end of the screw rod 117 is provided with a front guide ring 118 of the screw rod, and the front guide ring 118 of the screw rod is sleeved with a sliding sleeve 127 in contact with the inner wall of the hollow push rod 116; The front guide sleeve 122, the front guide sleeve 122 is positioned on the cylinder barrel 126 with the guide gland 131, and the lower end of the hollow push rod 116 is provided with a guide belt 128 to cooperate with the front guide sleeve 122; Ensure that the hollow push rod 116 reciprocates smoothly, and finally the hollow push rod 116 can push the workpiece to move smoothly.

As shown in Figures 1 to 3, a felt ring 109 is provided between the screw rod 117 and the thrust bearing cover 140, a shaft circlip 110 is provided on the shaft shoulder of the screw rod 117, and the main nut 114 is connected to the upper end of the nut seat 112 The gap is provided with a circlip 111 for the hole, so that the top of the electric push rod has good sealing performance. An O-ring 129 is set between the cylinder barrel 126 and the front guide sleeve 122, a seal ring 123 is provided between the front guide sleeve 122 and the hollow push rod 116, and a bud-shaped seal ring 122 and an anti-corrosion seal ring 122 are set between the guide gland 131 and the hollow push rod 116. Dust sealing ring 132; In addition, the bottom of the guide gland 131 is provided with a scraper ring 133 to prevent sludge from entering; the bottom cover of the hollow push rod 116 is provided with an inner hexagonal oil plug 130, and the inner hexagonal oil plug 130 can be opened to replace the dirt if necessary. Oil; through these measures constitute the lower sealing device of the electric push rod, it also has good sealing.

In the above embodiment, the end of the hollow push rod 116 is provided with an external thread, which is screwed into the nut seat 112 and fixed with a screw 115 to prevent the thread from loosening. The outer surface of the hollow push rod 116 can be electroplated, painted or sprayed. Ceramics and other processes for anti-corrosion treatment.

The utility model has been described in detail above, and the improvements and modifications made on this basis are also deemed to fall within the scope of protection defined by the claims of the utility model.

Claims (9)

1. A kind of 1. electric pushrod, it is characterised in that including cylinder barrel, main nut, hollow push rod and screw, the end of hollow push rod with Screw into the nut seat of main nut and be screwed into after an entirety closedly loaded in cylinder barrel, screw is loaded on master The inner cavity of nut and hollow push rod, and screw and main nut are with thread fitting, the output shaft drive connection of screw and gear reducer；Electricity The upper and lower end of dynamic push rod sets sealing device respectively.
2. 2. electric pushrod as claimed in claim 1, it is characterised in that be screw-driven pair, ball between screw and main nut Wire rod thread transmission or planetary roller wire rod thread transmission.
3. 3. electric pushrod as claimed in claim 1, it is characterised in that hollow push rod lower end extension connects suspending head.
4. 4. electric pushrod as claimed in claim 1, it is characterised in that hexagonal plug cock in being set on the bottom cover of hollow push rod.
5. 5. electric pushrod as claimed in claim 1, it is characterised in that the outer surface of hollow push rod carries out preservative treatment.
6. 6. electric pushrod as claimed in claim 1, it is characterised in that gear reducer is the worm-gear speed reducer or cone of hollow shaft Gear reduction unit.
7. 7. electric pushrod as claimed in claim 6, it is characterised in that gear reducer is sequentially connected with electric pushrod for screw thread pair.
8. 8. electric pushrod as claimed in claim 7, it is characterised in that gear reducer is connected by shaft coupling with motor.
9. 9. such as claim 1~8 any one of them electric pushrod, it is characterised in that the external two-direction switch of motor is to control just Reverse turn.