CN114024402B - Electric push rod - Google Patents

Abstract

The invention discloses an electric push rod with a limit switch, which comprises: the device comprises a shell assembly, a transmission mechanism and a driving mechanism. The electric push rod further comprises a limit switch accommodated in the hollow cavity of the shell assembly; the limit switch includes: the support rod, the expansion in-place trigger piece and the contraction in-place trigger piece; the supporting rod is fixed in the hollow cavity of the shell assembly, and the in-place extending trigger piece and the in-place contracting trigger piece are respectively arranged at two ends of the supporting rod; the sliding block is provided with a contact which is contacted with or separated from the contact of the expansion in-place trigger piece and the contraction in-place trigger piece. According to the electric push rod with the limit switch, when the telescopic rod reaches the limit position in the telescopic movement process, the limit switch is touched, so that the power output of the prime motor is immediately stopped, and the whole transmission device is prevented from being damaged due to the fact that the telescopic rod passes through the limit position.

Description

Electric push rod

Technical Field

The invention relates to the technical field of electric push rods, in particular to an electric push rod with a limit switch.

Background

In a solar photovoltaic power generation base, along with the continuous change of the irradiation angle of the sun, the angle of a solar cell panel needs to be adaptively adjusted, so that the solar energy is obtained to the maximum extent. The angle of the solar cell panel is adjusted, and transmission is realized mainly through a transmission device with a screw pair.

The prior art (CN 110259903 a) discloses a transmission device which transmits the power of a prime mover to a screw pair and realizes the telescopic movement of a telescopic rod by using the screw pair.

Above-mentioned prior art's transmission, when the telescopic link reached extreme position in the telescopic movement process, because do not set up corresponding limit switch, the telescopic link can not automatic stop motion, needs the manual control of operating personnel to manual control's precision is not high, makes the telescopic link extremely possible to cross extreme position and lead to whole transmission to take place to damage.

Therefore, how to design an electric push rod with a limit switch, when the telescopic rod reaches the limit position in the telescopic movement process, the limit switch is touched, so that the power output of the prime motor is immediately stopped, and the whole transmission device is prevented from being damaged due to the fact that the telescopic rod passes through the limit position, which is a technical problem to be solved by research personnel.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an electric push rod with a limit switch, when the telescopic rod reaches a limit position in the telescopic movement process, the telescopic rod touches the limit switch, so that the prime motor immediately stops power output, and the whole transmission device is prevented from being damaged due to the fact that the telescopic rod passes the limit position.

The aim of the invention is realized by the following technical scheme:

an electric putter with limit switch includes: a housing assembly, a transmission mechanism, and a drive mechanism;

the shell component is provided with a hollow cavity;

the transmission mechanism comprises: a sliding block, a screw rod and a telescopic rod; the sliding block is arranged in the hollow cavity of the shell component in a sliding manner along the axis direction, the screw rod is rotatably accommodated in the hollow cavity of the shell component, the sliding block is screwed on the screw rod, and the telescopic rod is movably inserted in the hollow cavity of the shell component along the axis direction and fixedly connected with the sliding block;

the driving mechanism is in driving connection with the screw rod;

the electric push rod further comprises a limit switch accommodated in the hollow cavity of the shell assembly; the limit switch includes: the support rod, the expansion in-place trigger piece and the contraction in-place trigger piece; the supporting rod is fixed in the hollow cavity of the shell assembly, and the expansion in-place trigger piece and the contraction in-place trigger piece are respectively arranged at two ends of the supporting rod; and a contact is arranged on the sliding block and is contacted with or separated from the contact points of the expansion in-place trigger piece and the contraction in-place trigger piece.

In one embodiment, the limit switch further comprises a mid-point in-place trigger; the middle point in-place trigger piece is arranged at the middle position of the supporting rod, and the contact is contacted with or separated from the contact of the middle point in-place trigger piece.

In one embodiment, the extended in-place trigger is in electrical signal connection with the drive mechanism, the retracted in-place trigger is in electrical signal connection with the drive mechanism, and the midpoint in-place trigger is in electrical signal connection with the drive mechanism.

In one embodiment, the support rod is an elastic long rod, two ends of the support rod are respectively inserted into the cavity wall of the hollow cavity of the shell assembly, and the middle part of the support rod is suspended.

In one of the embodiments of the present invention,

the housing assembly includes: sleeve, gear box, bearing box; the sleeve, the gear box and the bearing box are sequentially connected and communicated with each other;

the sliding block is arranged in the sleeve in a sliding manner along the axis direction, the screw rod is rotatably accommodated in the sleeve, the gear box and the bearing box, and the telescopic rod is movably inserted into the sleeve along the axis direction;

the driving mechanism comprises a motor and a gear assembly; the gear assembly is accommodated in the gear box, and the motor is in driving connection with the screw rod through the gear assembly;

and a bearing assembly is arranged in the bearing box, and one end of the screw rod is connected with the bearing assembly.

In one embodiment, the bearing assembly includes: the device comprises a bearing sleeve, a front end axial stress bearing, a rear end axial stress bearing, an axial support ring and a radial stress bearing;

the bearing sleeve is arranged in the bearing box; the front end axial stress bearing and the rear end axial stress bearing are contained in the bearing sleeve, the axial support ring is clamped between the front end axial stress bearing and the rear end axial stress bearing, and the radial stress bearing is positioned outside the bearing sleeve;

one end of the screw rod sequentially penetrates through the front end axial stress bearing, the axial support ring, the rear end axial stress bearing and the radial stress bearing; the axial support ring is provided with a connecting hole, the screw rod is provided with a connecting rod, and the connecting rod is inserted into the connecting hole;

an anti-impact buffer part is also arranged in the bearing box; the anti-impact buffer piece comprises a base and a buffer structure arranged on the base; the buffer structure includes: a plurality of concentric rings of different sizes, a plurality of radial lines connecting the concentric rings; a plurality of concentric rings and a plurality of radial lines form a plurality of buffer gaps between each other;

the center of the buffer structure is provided with a radial bearing accommodating cavity, the cavity wall of the radial bearing accommodating cavity is provided with a radial stress surface, and the outer ring of the radial stress bearing is pressed on the radial stress surface of the cavity wall of the radial bearing accommodating cavity;

and one end surface of the buffer structure, which is far away from the base, forms an axial stress surface, and the bearing sleeve is pressed on the axial stress surface.

In one embodiment, the inner wall of the sleeve is provided with a limiting chute along the axial direction of the sleeve, the sliding block is provided with a limiting projection, and the limiting projection is slidingly accommodated in the limiting chute.

In one embodiment, one end of the telescopic rod, which is positioned in the sleeve, is in threaded connection with the sliding block.

According to the electric push rod with the limit switch, when the telescopic rod reaches the limit position in the telescopic movement process, the limit switch is touched, so that the power output of the prime motor is immediately stopped, and the whole transmission device is prevented from being damaged due to the fact that the telescopic rod passes through the limit position.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of an electric putter according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the electric putter of FIG. 1;

FIG. 3 is a block diagram of the electric putter of FIG. 1 with the housing assembly removed;

FIG. 4 is a partial view of the electric putter of FIG. 3;

FIG. 5 is an exploded view (I) of the electric putter of FIG. 1;

FIG. 6 is an exploded view (II) of the electric putter of FIG. 1;

FIG. 7 is a block diagram of a bearing housing of the electric putter of FIG. 5;

FIG. 8 is a perspective view of the impact bumper within the bearing housing shown in FIG. 7;

FIG. 9 is a plan view of the impact-resistant bumper within the bearing housing shown in FIG. 7;

FIG. 10 is a state diagram of the electric putter of FIG. 1 during operation;

FIG. 11 is a schematic view of a push-type fastener sequentially inserted into a second positioning through hole and a first positioning through hole;

FIG. 12 is a block diagram of the push-on fastener of FIG. 11;

FIG. 13 is a state diagram (one) of the push-type fastener of FIG. 12;

FIG. 14 is a state diagram (II) of the push-type fastener of FIG. 12;

fig. 15 is a state diagram (iii) of the push-type fastener shown in fig. 12.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, an electric putter 10 with limit switch includes: a housing assembly 100, a transmission mechanism 200, and a drive mechanism 300.

The housing assembly 100 has a hollow cavity.

As shown in fig. 2, the transmission mechanism 200 includes: a sliding block 210, a screw 220 and a telescopic rod 230. The sliding block 210 is slidably disposed in the hollow cavity of the housing assembly 100 along the axis direction, the screw rod 220 is rotatably accommodated in the hollow cavity of the housing assembly 100, the sliding block 210 is screwed on the screw rod 220, and the telescopic rod 230 is movably inserted in the hollow cavity of the housing assembly 100 along the axis direction and fixedly connected with the sliding block 210.

As for the slider 210 slidably provided in the hollow cavity of the housing assembly 100 in the axial direction, there may be mentioned an embodiment in which: the inner wall of the hollow cavity of the housing assembly 100 is provided with a limiting chute (not shown) along the axial direction thereof, and the slider 210 is provided with a limiting projection 211 (as shown in fig. 4), wherein the limiting projection 211 is slidingly accommodated in the limiting chute. Thus, the slider 210 can reciprocally slide along the axial direction of the hollow cavity of the housing assembly 100 without rotating itself.

Regarding the telescopic rod 230 movably inserted into the hollow cavity of the housing assembly 100 along the axial direction and fixedly connected with the slider 210, there may be embodiments as follows: one end of the telescopic rod 230 is in threaded connection with the sliding block 210, and the purpose of quick assembly and disassembly can be achieved through threaded connection.

The driving mechanism 300 is in driving connection with the screw 220. The driving mechanism 300 is used to drive the screw 220 to rotate in a forward direction or in a reverse direction.

As shown in fig. 2, the electric putter 10 further includes a limit switch 400 accommodated in the hollow cavity of the housing assembly 100. Limit switch 400 includes: the support pole 410, the extended in place trigger 420, and the retracted in place trigger 430. The support rod 410 is fixed in the hollow cavity of the housing assembly 100, and the expansion in-place trigger piece 420 and the contraction in-place trigger piece 430 are respectively arranged at two ends of the support rod 410; the slider 210 is provided with contacts that touch or separate from the contacts of the extended in-place trigger 420 and the retracted in-place trigger 430.

Next, the operation principle of the electric putter 10 having the above-described structure will be described:

the driving mechanism 300 drives the screw 220 to rotate forward;

the forward rotating screw 220 drives the slider 210 screwed thereon to slide forward along the axial direction of the housing assembly 100;

the sliding block 210 sliding forward further drives the telescopic rod 230 connected with the sliding block to slide forward along the axial direction of the housing assembly 100, so that the telescopic rod 230 stretches out of the housing assembly 100;

the driving mechanism 300 drives the screw 220 to reversely rotate;

the screw 220 rotated in the opposite direction drives the slider 210 screwed thereto to slide in the opposite direction along the axial direction of the housing assembly 100;

the slider 210, which slides in the opposite direction, in turn drives the telescopic rod 230 connected thereto in the opposite direction along the axial direction of the housing assembly 100, so that the telescopic rod 230 is retracted back into the housing assembly 100.

In the present invention, in particular, the limit switch 400 is disposed in the hollow cavity of the housing assembly 100, and the in-place extending trigger 420 and the in-place retracting trigger 430 are disposed at two ends of the supporting rod 410, respectively, so that the slider 210 contacts or separates from the contact on the in-place extending trigger 420 or the contact on the in-place retracting trigger 430 during the sliding of the slider 210 reciprocally along the axial direction of the housing assembly 100;

when the slider 210 touches a contact point on the in-place extending trigger piece 420, the expansion link 230 is extended to the limit position, the in-place extending trigger piece 420 sends a signal to the driving mechanism 300, and the driving mechanism 300 stops driving the screw rod 220;

when the slider 210 touches a contact on the retract-in-place trigger 430, indicating that the telescoping rod 230 has retracted to the extreme position, the extend-in-place trigger 420 sends a signal to the drive mechanism 300, and the drive mechanism 300 stops driving the lead screw 220.

Further, limit switch 400 also includes a mid-point-to-position trigger (not shown). The mid-point in-place trigger is located in the middle of the support bar 410 and the contacts touch or separate from the contacts of the mid-point in-place trigger. By setting the mid-point in-place trigger, the telescopic rod 230 can temporarily stay in the middle position in the process of extending or contracting, and thus the telescopic distance of the telescopic rod 230 can be effectively adjusted according to actual conditions.

In the process of the sliding block 210 sliding reciprocally, the contact on the sliding block 210 will mechanically collide with the contact of the extending in-place trigger piece 420 and the contracting in-place trigger piece 430, and in order to improve the service life of the whole structure, the invention also particularly improves the structure and the installation mode of the supporting rod 410. In the present invention, the support rod 410 is an elastic bar, two ends of the support rod 410 are respectively inserted into the cavity wall of the hollow cavity of the housing assembly 100, and the middle part of the support rod 410 is suspended. Thus, during the collision of the contact with the contact, the support rod 410 may elastically deform to some extent to form a relief, and during the separation of the contact from the contact, the support rod 410 may rebound. It should be noted that, in the present embodiment, two ends of the support rod 410 are respectively inserted into the cavity walls of the hollow cavity of the housing assembly 100, and the two ends of the support rod 410 are fixed, so that the support rod 410 can be installed rapidly and stably; the middle part of the support rod 410 is suspended, and the support rod 410 only needs to rebound slightly, so that the rebound stability of the support rod 410 is fully ensured, and the service life of the support rod 410 is prolonged.

In the electric putter 10 having the above-described structure, when the driving mechanism 300 drives the screw 220 to rotate, the screw 220 generates an instantaneous impulse having both an axial impulse and a radial impulse, and the impulse may damage other components. It will be appreciated that the impact force is generated, which is equivalent to the use of a "hammer" to strike an object, which is extremely vulnerable to damage at the moment it is struck.

To solve this technical problem, the electric putter 10 of the present invention is structurally modified as follows:

as shown in fig. 1, the housing assembly 100 includes: sleeve 110, gear box 120, bearing housing 130. The sleeve 110, the gear case 120, and the bearing housing 130 are connected in order and communicate with each other.

The slider 210 is slidably disposed in the sleeve 110 along the axial direction, the screw 220 is rotatably accommodated in the sleeve 110, the gear box 120 and the bearing housing 130, and the telescopic rod 230 is movably inserted in the sleeve 110 along the axial direction.

As shown in fig. 2 and 3, the driving mechanism 300 includes a motor 310 and a gear assembly 320. The gear assembly 320 is accommodated in the gear box 120, and the motor 310 is in driving connection with the screw 220 through the gear assembly 320.

As shown in fig. 3, a bearing assembly 140 is provided in the bearing housing 130, and one end of the screw 220 is connected to the bearing assembly 140.

The electric putter 10 of the present invention has the greatest feature in that a bearing housing 130 is additionally provided outside the gear housing 120, compared with the conventional structure. The bearing assembly 140 is placed in the bearing housing 130 and one end of the screw 220 is connected to the bearing assembly 140. Such a structural modification is made so that the bearing assembly 140 is no longer disposed within the gear case 120, the bearing assembly 140 no longer shares a housing with the gear assembly 320, and the bearing assembly 140 uses a separate bearing housing 130 alone.

Since the bearing assembly 140 uses a separate bearing housing 130 alone, this is: in one aspect, the structure of the bearing assembly 140 can be reinforced to the greatest extent, for example, the size of the bearing assembly 140 is larger, and the bearing assembly 140 with larger size can better improve the stress intensity; on the other hand, the structure of the bearing housing 130 may be reinforced to the greatest extent, for example, the wall thickness of the housing 130 is increased, for example, a material with higher strength is used, and for example, a buffer structure matched with the bearing assembly 140 is embedded in the housing.

The placement of the buffer structure in the housing in cooperation with the bearing assembly 140 is one embodiment that better addresses the impulse problems described above.

Specifically, as shown in fig. 4, the bearing assembly 140 includes: bearing housing 141, front end axial force bearing 142, rear end axial force bearing 143, axial support ring 144, radial force bearing 145.

As shown in fig. 4, the bearing housing 141 is installed in the bearing housing 130; the front end axial force bearing 142 and the rear end axial force bearing 143 are accommodated in the bearing housing 141, the axial support ring 144 is clamped between the front end axial force bearing 142 and the rear end axial force bearing 143, and the radial force bearing 145 is located outside the bearing housing 141.

As shown in fig. 4, one end of the screw rod 220 is sequentially inserted through a front end axial force bearing 142, an axial support ring 144, a rear end axial force bearing 143, and a radial force bearing 145. The axial support ring 144 is provided with a connecting hole 144a, the screw rod 220 is provided with a connecting rod 221, and the connecting rod 221 is inserted into the connecting hole 144 a.

Further, as shown in fig. 6 and 7, an impact-proof buffer 150 is further provided in the bearing housing 130. Referring to fig. 8 and 9, the anti-impact buffer 150 includes a base 151 and a buffer structure 152 disposed on the base 151. The buffer structure 152 includes: a plurality of concentric rings 153 of different sizes, a plurality of radial lines 154 connecting the concentric rings. The plurality of concentric rings 153 and the plurality of radial lines 154 form a plurality of buffer gaps 155 therebetween.

As shown in fig. 8 and 9, the center of the buffer structure 152 forms a radial bearing accommodating cavity 156, the cavity wall of the radial bearing accommodating cavity 156 forms a radial stress surface 157, and the outer ring of the radial stress bearing 145 is pressed against the radial stress surface 157 of the cavity wall of the radial bearing accommodating cavity 156.

An end surface of the buffer structure 152 remote from the base 151 forms an axial force-bearing surface 158, and the bearing housing 141 is pressed against the axial force-bearing surface 158.

Next, the design principle of the bearing assembly 140 and the impact damper 150 having the above-described structure will be described.

1. The buffer structure 152 includes a plurality of concentric rings 153 with different sizes and a plurality of radial lines 154 connecting the concentric rings, wherein the plurality of concentric rings 153 and the plurality of radial lines 154 form a plurality of buffer gaps 155 therebetween, and the formation of the plurality of buffer gaps 155 can effectively absorb instantaneous impact force generated by the screw rod 220;

2. an end surface of the buffer structure 152 away from the base 151 forms an axial stress surface 158, the bearing sleeve 141 is pressed against the axial stress surface 158, the axial stress surface 158 is used for bearing an axial impact force applied to the bearing sleeve 141 by the screw rod 220, and when the axial stress surface 158 receives the axial impact force, the whole buffer structure 152 is extremely easy to distort and deform towards the radial bearing accommodating cavity 156 due to the radial bearing accommodating cavity 156 formed at the central position of the buffer structure 152, and the buffer performance of the buffer structure 152 is also reduced over time; rather, the radial bearing accommodating cavity 156 has a radial bearing surface 157 formed on the cavity wall, and the outer ring of the radial bearing 145 is pressed against the radial bearing surface 157 of the radial bearing accommodating cavity 156, so that the radial bearing accommodating cavity 156 is supported by the radial bearing 145 along the radial direction, and even if the buffer structure 152 is affected by the axial impact, the whole buffer structure 152 will not twist toward the radial bearing accommodating cavity 156, and the buffer function is achieved by a plurality of buffer gaps 155 formed by the concentric rings 153 and the radial lines 154;

3. at the moment of starting the screw 220, the screw 220 also generates a radial impact force, and the radial stress bearing 145 is placed in the radial bearing accommodating cavity 156, the radial stress bearing 145 applies the impact force to the radial lines 154 connected with the concentric rings through the radial stress surface 157, and the radial lines 154 can stably resist the radial impact force due to the radial lines 154 extending along the radial line direction;

4. the front end axial stress bearing 142 and the rear end axial stress bearing 143 are arranged in the bearing sleeve 141, the axial support ring 144 is clamped between the front end axial stress bearing 142 and the rear end axial stress bearing 143, and the screw rod 220 is connected with the axial support ring 144, so that the front end axial stress bearing 142 and the rear end axial stress bearing 143 provide axial support for the screw rod 220;

5. a radial bearing accommodating cavity 156 is formed at the center of the buffer structure 152, and a radial stress bearing 145 is arranged in the radial bearing accommodating cavity 156, on one hand, the radial bearing accommodating cavity 156 solves the problem of placing the radial stress bearing 145, on the other hand, the radial stress bearing 145 provides support for a radial stress surface 157 of the radial bearing accommodating cavity 156 so as to prevent the buffer structure 152 from being distorted and deformed due to axial impact force, on the other hand, the radial bearing accommodating cavity 156 wraps the radial stress bearing 145, and the radial stress bearing 145 transmits the impact force to the radial line 154 through the radial stress surface 157;

6. the impact-proof buffer 150 of the present invention is of a detachable structure, for example, the bearing housing 130 is connected to the fastening screw hole 159 on the base 151 through the fastening bolt 131, and the buffer performance of the impact-proof buffer 150 is lowered during the long-term use, at this time, the fastening bolt 131 may be screwed, the old impact-proof buffer 150 may be replaced with a new impact-proof buffer 150.

As shown in fig. 1, the electric putter 10 of the present invention further includes a first connecting member 500, where the first connecting member 500 is located outside the sleeve 110 and is screwed with the telescopic rod 230, and the first connecting member 500 is provided with a first connecting hole 510.

As shown in fig. 1, the electric putter 10 of the present invention further includes a second connecting member 600, where the second connecting member 600 is located outside the bearing housing 130, the second connecting member 600 is threaded through a fastening bolt 131 on a wall of the bearing housing 130 and is screwed with a fastening threaded hole 159 on the base 151, a second connecting hole 610 is formed in the second connecting member 600, and a connecting bearing 611 is disposed in the second connecting hole 610.

The electric push rod 10 forms a complete set of device by arranging the first connecting piece 500 and the second connecting piece 600, and can be matched with external arrangement for use. For example, the electric putter 10 is applied to a solar photovoltaic power generation base, and the angle of the solar cell panel is adjusted.

In the manufacturing process of the electric putter 10, the second connection member 600 is manufactured separately from the bearing housing 130, and the manufactured second connection member 600 is connected to the bearing housing 130 again in the assembly stage. As shown in fig. 10, the telescopic rod 230 also rotates about the second connecting hole 610 as a central axis during the telescopic operation of the electric putter 10. During the rotation of the electric putter 10, there is a great stress concentration (particularly, the surface of the hollow bearing housing 130) at the connection of the second connection member 600 and the bearing housing 130 due to a great torsion force, and the stress concentration acts on some weak points to easily break, so that a production accident easily occurs once the connection of the second connection member 600 and the bearing housing 130 breaks. If the second connector 600 is considered to be manufactured integrally with the bearing housing 130 to reduce the stress concentration phenomenon, the manufacturing difficulty and the manufacturing cost are multiplied, which is not an optimal option.

In order to reduce the manufacturing difficulty and the manufacturing cost as much as possible, and to solve the technical problems in an optimized manner, the present invention is designed in such a way that the second connector 600 is inserted into the wall of the bearing housing 130 by the fastening bolt 131 (as shown in fig. 5 and 6) and is screwed with the fastening screw hole 159 (as shown in fig. 9) on the base 151, and the joint of the second connector 600 and the bearing housing 130 forms a planar press.

The second connection member 600 is coupled with the fastening screw hole 159 of the base 151 by the fastening bolt 131, and on one hand, the fastening bolt 131 can tightly lock the impact buffer 150 inside the bearing housing 130, and on the other hand, the fastening bolt 131 can tightly lock the second connection member 600 to the bearing housing 130, so that the coupling planes of the second connection member 600 and the bearing housing 130 are tightly pressed together. In addition, since the impact-resistant buffer member 150 itself has a superior buffering performance, the impact-resistant buffer member 150 is elastically deformed during the fastening of the fastening bolt 131, and the elastic deformation can make the fastening bolt 131 more firmly connect the second connection member 600 with the bearing housing 130.

During the rotation of the entire electric putter 10 about the second connection hole 610 as the central axis, although the surface portion of the bearing housing 130 is subjected to stress concentration, due to the impact-resistant buffer member 150, the impact-resistant buffer member 150 is elastically deformed to some extent, and this elastic deformation effectively reduces the risk of tearing the surface of the bearing housing 130 due to stress concentration.

In the electric putter 10 of the present invention, a bearing housing 130 is additionally provided at the outside of the gear housing 120, and an impact buffer 150 is provided at the inside of the bearing housing 130, the bearing assembly 140 is placed in the bearing housing 130 to be engaged with the impact buffer 150, and in addition, a second connector 600 is inserted into the wall of the bearing housing 130 through a fastening bolt 131 to be screwed with a fastening screw hole 159 on the base 151. On the basis of additionally arranging a bearing housing 130 outside the gear case 120, particularly, arranging the anti-impact buffer member 150, a plurality of technical problems are solved:

1. the impact-resistant buffer 150 provides axial support and buffering for the screw 220 through the bearing assembly 140;

2. the impact-resistant buffer 150 provides radial support and buffering for the screw 220 through the bearing assembly 140;

3. the impact-resistant bumper 150 provides a connection for the second connector 600 and effectively reduces the risk of tearing the surface of the bearing housing 130 due to stress concentrations.

As shown in fig. 6, the sleeve 110 of the present invention includes a sleeve body 111 and an end plate 112 covering one end surface of the sleeve body 111. The end plate 112 is usually fastened on the end surface of the sleeve body 111 by screwing, but screwing is time-consuming and labor-consuming and requires controlling the torque of the screw; moreover, after a period of use, the nut portion of the screw is susceptible to corrosion damage, resulting in failure to remove the screw. How to design a fastener which can be assembled conveniently and quickly and is not easy to take out is a technical problem which needs to be solved by the person skilled in the art.

As shown in fig. 6 and 11, the end surface of the sleeve body 111 is provided with a first positioning through hole 113, the end panel 112 is provided with a second positioning through hole 114, and the pressing fastener 700 is sequentially inserted into the second positioning through hole 114 and the first positioning through hole 113, so as to cover the end panel 112 on the end surface of the sleeve body 111.

As shown in fig. 12, the push-type fastener 700 includes a closing portion 710 and an elastic clamping portion 720, wherein the closing portion 710 is connected with the elastic clamping portion 720, and the closing portion 710 and the elastic clamping portion 720 are both hollow structures. The elastic clamping portion 720 includes a plurality of elastic pieces 721, and the plurality of elastic pieces 721 are distributed in an annular array. After the push type fastener 700 is inserted into the first positioning through hole 113 and the second positioning through hole 114, the elastic piece 721 is clamped with the first positioning through hole 113 and the second positioning through hole 114, so that the push type fastener 700 is prevented from being separated. Preferably, the elastic piece 721 of the elastic catching portion 720 is provided with a locking guide surface 722 and a protruding end 723.

As shown in fig. 13, further, the push-type fastener 700 is provided with an unlocking assembly 800, and the unlocking assembly 800 includes: unlocking lever 810, base 820, and movable ring 830. Wherein, unlocking lever 810 is located in closing portion 810 through pressing elastic piece 811 sliding, and base 820 is fixed to be located in the elasticity card holds portion 820, and expansion ring 830 slides and locates on the base 820, and expansion ring 830 is connected with base 820 magnetism absorption, is equipped with on the base 820 with expansion ring 830 complex fixed ring 840, is equipped with on the unlocking lever 810 with fixed ring 840, expansion ring 830 complex staple 812. Preferably, the pressing elastic member 811 is a spring structure.

As shown in fig. 13, in the present embodiment, a staple 812 is provided on an unlocking lever 810 by a return elastic member 813, and the staple 812 has a guide inclined surface 814. The fixing ring 840 is provided with an arc-shaped guide surface 841, and the fixing ring 840 is provided with a receiving groove 842 to be engaged with the movable ring 830, a specific engagement process will be described later. Preferably, the movable ring 830 is provided with a first unlocking inclined plane 831 and a second unlocking inclined plane 832. Further, the unlocking lever 810 is provided with a limit stopper ring 815, and the limit stopper ring 815 is used to limit the sliding range of the unlocking lever 210 to prevent the dislocation thereof.

The working principle of the push-type fastener 700 of the present invention will be described with reference to the above-described configuration:

as shown in fig. 11, when the end plate 112 is to be covered on the end surface of the sleeve body 111, only the push-type fastener 700 needs to be inserted into the second positioning through hole 114 and the first positioning through hole 113 in order. When the elastic piece 721 is inserted, the locking guide surface 722 of the elastic piece 721 is first held by the Kong Biya, and the elastic piece 721 is deformed by the application of pressure, so that the elastic holding portion 720 is inserted into the hole. Then, the protruding ends 723 of the elastic pieces 721 will be caught with each other with the hole walls, and the push type fastener 700 is inserted into the positioning through hole. After plugging, the closing part 710 of the push-type fastener 700 seals the positioning through hole to achieve a dustproof effect, and the elastic piece 721 of the elastic clamping part 720 tightly clamps the positioning through hole under the action of elastic force, so that the push-type fastener 700 is prevented from being separated from the positioning through hole;

when the end plate 112 is to be separated from the end surface of the sleeve body 111, the unlocking operation of the unlocking assembly 800 is required to change its state. Specifically, in the initial state (as shown in fig. 13), the unlocking lever 810 is accommodated in the closing portion 710, at this time, the staple 812 is abutted against the groove wall of the accommodation groove 842 of the fixing ring 840, and the movable ring 830 is far away from the fixing ring 240 under the magnetic attraction of the base 820. For a clearer description, the unlocking operation of the unlocking assembly 800 is divided into three steps, specifically:

as shown in fig. 14, the first step: pressing down the unlocking lever 810 causes the unlocking lever 810 to slide down against the elastic force of the pressing elastic member 811, and the staple 812 on the unlocking lever 810 will touch and press the movable ring 830. At this time, the guide inclined surface 814 of the staple 812 contacts the first unlocking inclined surface 831 of the movable ring 830, and since both are inclined surfaces, as the external pressure continues to be applied, the staple 812 overcomes the elastic force of the reset elastic member 813 and passes over the first unlocking inclined surface 831 to be abutted against the second unlocking inclined surface 832;

as shown in fig. 15, the second step: when the pressure of the unlocking lever 810 is released, the unlocking lever 810 starts to slide upward by the elastic force of the pressing elastic member 811, and the staple 812 overcomes the magnetic attraction between the movable ring 830 and the base 820 due to the abutment of the staple 812 and the second unlocking inclined surface 832, thereby moving the movable ring 830 together in a direction approaching the fixed ring 840. Then, the movable ring 830 cannot slide further due to the blocking of the fixed ring 840, and the movable ring 830 will be partially received in the receiving groove 842, and the movable ring 830 and the fixed ring 840 form a whole;

as shown in fig. 15, the third step: as the unlocking lever 810 further rises, the staple 812 will continue to rise along the second unlocking inclined surface 832 of the movable ring 830, and at the same time, the staple 812 makes a retreating action against the elastic force of the reset elastic member 813, and then, the staple 812 passes over the movable ring 830 and the fixed ring 840. In this state, the unlocking lever 810 partially protrudes out of the closing portion 710; at the same time, the movable ring 830 is reset under the magnetic attraction of the base 820;

thereafter, the worker pulls out the push-type fastener 700 from the positioning through-hole by gripping the protruding portion of the release lever 810 by a tool, thereby separating the end plate 112 from the end surface of the sleeve body 111.

It should be noted that, when the unlocking lever 810 protrudes out of the closing portion 710, the limiting stopper ring 815 on the unlocking lever 810 will abut against the closing portion 710, on the one hand, to prevent the unlocking lever 810 from separating from the closing portion 710 under the action of the pressing elastic member 811; on the other hand, when a worker grasps the unlocking lever 810 to withdraw the push-type fastener 700, the pulling force on the unlocking lever 810 is transmitted to the closing portion 710 through the limit stopper ring 815, thereby achieving a more uniform force.

It is further noted that the push-type fastener 700 of the present invention can be installed more conveniently, and when connection is required, the push-type fastener 700 is simply pressed into the positioning through hole 101 with force. Also, after installation, the push-type fastener 700 is flush with the surface of the end plate 112, water stains and the like are less likely to remain at the closure 710, and thus the push-type fastener 700 is less likely to be corroded by oxidation than a different screw.

As shown in fig. 12, in one embodiment, the closure portion 710 includes an upper sealing tab 711 and a lower sealing tab 712. Preferably, the lower blocking tab 712 is a rubber structure. When the push type fastener 700 is installed, the upper sealing piece 711 may be flush with the surface of the end plate 112, and the lower sealing piece 712 may seal the gap between the elastic catching portion 720 and the positioning through hole, preventing moisture from entering inside.

As can be seen from the above, the push-type fastener 700 of the present invention has the characteristics of easy insertion and difficult removal, and when the push-type fastener 700 is inserted into the second positioning through hole 114 and the first positioning through hole 113 in sequence, the end plate 112 can be covered on the end surface of the sleeve body 111; while in the removal, on the one hand, the release lever 810 needs to be pushed out from the closing portion 810, and on the other hand, the operator needs to use a tool to clamp the protruding portion of the release lever 810, so that the push-type fastener 700 can be removed from the positioning through hole.

In addition, the closing part 710 of the present invention includes an upper sealing piece 711 and a lower sealing piece 712, the upper sealing piece 711 and the lower sealing piece 712 are spaced apart from each other and form a space, such a structure can well adapt to positioning through holes of different sizes, the positioning through holes are slightly larger or smaller, and the upper sealing piece 711 and the lower sealing piece 712 can be elastically deformed to a certain extent to adapt. If the upper sealing plate 711 and the lower sealing plate 712 are not spaced apart from each other to form a single body, it is difficult to elastically deform, and compatibility is greatly impaired.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (6)

1. An electric putter with limit switch, characterized in that includes: a housing assembly, a transmission mechanism, and a drive mechanism; the shell component is provided with a hollow cavity; the transmission mechanism comprises: a sliding block, a screw rod and a telescopic rod; the sliding block is arranged in the hollow cavity of the shell component in a sliding manner along the axis direction, the screw rod is rotatably accommodated in the hollow cavity of the shell component, the sliding block is screwed on the screw rod, and the telescopic rod is movably inserted in the hollow cavity of the shell component along the axis direction and fixedly connected with the sliding block; the driving mechanism is in driving connection with the screw rod; the electric push rod further comprises a limit switch accommodated in the hollow cavity of the shell assembly; the limit switch includes: the support rod, the expansion in-place trigger piece and the contraction in-place trigger piece; the supporting rod is fixed in the hollow cavity of the shell assembly, and the expansion in-place trigger piece and the contraction in-place trigger piece are respectively arranged at two ends of the supporting rod; the sliding block is provided with a contact which is contacted with or separated from the contact of the expansion in-place trigger piece and the contraction in-place trigger piece;

the housing assembly includes: sleeve, gear box, bearing box; the sleeve, the gear box and the bearing box are sequentially connected and communicated with each other; the sliding block is arranged in the sleeve in a sliding manner along the axis direction, the screw rod is rotatably accommodated in the sleeve, the gear box and the bearing box, and the telescopic rod is movably inserted into the sleeve along the axis direction; the driving mechanism comprises a motor and a gear assembly; the gear assembly is accommodated in the gear box, and the motor is in driving connection with the screw rod through the gear assembly; a bearing assembly is arranged in the bearing box, and one end of the screw rod is connected with the bearing assembly;

the bearing assembly includes: the device comprises a bearing sleeve, a front end axial stress bearing, a rear end axial stress bearing, an axial support ring and a radial stress bearing; the bearing sleeve is arranged in the bearing box; the front end axial stress bearing and the rear end axial stress bearing are contained in the bearing sleeve, the axial support ring is clamped between the front end axial stress bearing and the rear end axial stress bearing, and the radial stress bearing is positioned outside the bearing sleeve; one end of the screw rod sequentially penetrates through the front end axial stress bearing, the axial support ring, the rear end axial stress bearing and the radial stress bearing; the axial support ring is provided with a connecting hole, the screw rod is provided with a connecting rod, and the connecting rod is inserted into the connecting hole;

an anti-impact buffer part is also arranged in the bearing box; the anti-impact buffer piece comprises a base and a buffer structure arranged on the base; the buffer structure includes: a plurality of concentric rings of different sizes, a plurality of radial lines connecting the concentric rings; a plurality of concentric rings and a plurality of radial lines form a plurality of buffer gaps between each other; the center of the buffer structure is provided with a radial bearing accommodating cavity, the cavity wall of the radial bearing accommodating cavity is provided with a radial stress surface, and the outer ring of the radial stress bearing is pressed on the radial stress surface of the cavity wall of the radial bearing accommodating cavity; and one end surface of the buffer structure, which is far away from the base, forms an axial stress surface, and the bearing sleeve is pressed on the axial stress surface.

2. The electric putter with limit switch of claim 1, wherein the limit switch further comprises a mid-point-to-position trigger; the middle point in-place trigger piece is arranged at the middle position of the supporting rod, and the contact is contacted with or separated from the contact of the middle point in-place trigger piece.

3. The electric putter with limit switch of claim 2, wherein the extended in place trigger is electrically connected to the drive mechanism, the retracted in place trigger is electrically connected to the drive mechanism, and the midpoint in place trigger is electrically connected to the drive mechanism.

4. The electric push rod with the limit switch according to claim 2, wherein the support rod is an elastic strip rod, two ends of the support rod are respectively inserted into the cavity wall of the hollow cavity of the shell assembly, and the middle part of the support rod is suspended.

5. The electric push rod with the limit switch according to claim 1, wherein the inner wall of the sleeve is provided with a limit chute along the axis direction of the sleeve, the slide block is provided with a limit bump, and the limit bump is slidingly accommodated in the limit chute.

6. The electric putter with limit switch of claim 1, wherein the end of the telescopic rod located in the sleeve is in threaded connection with the slider.

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