CN215344257U

CN215344257U - Linear motion mechanism

Info

Publication number: CN215344257U
Application number: CN202121760551.XU
Authority: CN
Inventors: 杨鑫; 蒋斌; 张春飞
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-28
Anticipated expiration: 2031-07-30

Abstract

The present invention relates to a linear motion mechanism, comprising: the device comprises an outer tube, a screw rod partially extending into the outer tube, a positioning piece arranged on the screw rod, at least one sensing element and at least one positioning hole arranged on the side wall of the outer tube. The outer tube is provided with a hollow accommodating cavity; a screw rod partially inserted in the accommodating cavity and adapted to make a linear reciprocating motion; the positioning piece is fixedly arranged on the end part of the screw rod arranged in the accommodating cavity; the sensing element is arranged on the outer side wall of the outer tube; the positioning hole is arranged on the tube wall of the outer tube and penetrates through the accommodating cavity, and the sensing head of the sensing element penetrates through the positioning hole and then extends into the accommodating cavity to be suitable for being in contact with the positioning piece. The utility model can simplify the structure of the outer pipe to facilitate the maintenance.

Description

Linear motion mechanism

Technical Field

The utility model relates to the technical field of motors, in particular to a linear motion mechanism.

Background

The existing linear motion mechanism needs to be reduced to the minimum installation size and locked to rotate when being used for zero calibration, the motor drives the gear in the gear box to transmit, an inner hole of the tail end gear is provided with an internal thread, the end part of the screw rod is close to the outer tube to realize locked rotation, and then the zero calibration of the linear motion mechanism is realized.

The above-mentioned condition of realizing zero calibration through the mode of locked rotor has following technical problem:

the tip of lead screw has the scour protection gasket, the scour protection gasket adopts the mode of screw fixed with the lead screw, the head of screw promptly, the nut is located the tip of lead screw, when the stifled commentaries on classics is realized to lead screw and outer tube, take place the stifled commentaries on classics by the nut that is located the lead screw tip with the outer tube, after the motor reversal, the nut and the outer tube separation of lead screw tip, and nut contact outer tube is opposite with the power of exerting of leaving the outer tube, multitime stifled commentaries on classics and reversal back, the condition that the screw drops appears easily, cause the lead screw, the separation of scour protection gasket and screw.

In addition, for the structure of controlling the motion stroke of the linear motion mechanism by arranging the micro switch in the prior art, the outer tube of the linear motion mechanism has a complex structure and high cost, and is not easy to maintain.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a linear motion mechanism to solve the technical problem of simplifying the structure of an outer pipe so as to facilitate maintenance.

The linear motion mechanism of the utility model is realized by the following steps:

a linear motion mechanism comprising:

an outer tube having a hollow receiving cavity;

a screw rod partially inserted into the accommodating cavity and adapted to make a linear reciprocating motion;

the positioning piece is fixedly arranged on the end part of the screw rod arranged in the accommodating cavity;

the sensing element is arranged on the outer side wall of the outer tube;

and the positioning hole is arranged on the tube wall of the outer tube and penetrates through the accommodating cavity, and the sensing head of the sensing element penetrates through the positioning hole and then extends into the accommodating cavity so as to be suitable for being in contact with the positioning piece.

In an alternative embodiment of the present invention, the positioning member is a flat gasket having an annular structure.

In an alternative embodiment of the utility model, the flat washer is fixed to the screw by means of a screw.

In an optional embodiment of the present invention, an elastic washer is further disposed between the nut of the screw and the flat washer, and the elastic washer is disposed on the screw.

In an optional embodiment of the utility model, two positioning holes are arranged on the pipe wall of the outer pipe at intervals; and

the outer side wall of the outer tube is provided with two sensing elements which correspond to the two positioning holes one to one; wherein

The two sensing elements are adapted to sense extreme positions of the extended and retracted states of the screw rod in the linear reciprocating motion, respectively.

In an alternative embodiment of the present invention, the sensing element employs a micro switch; and

and the contact piece of the microswitch penetrates through the positioning hole and then extends into the accommodating cavity.

In an optional embodiment of the utility model, a positioning sleeve for assembling and fixing the microswitch is arranged on the outer side wall of the outer tube corresponding to the positioning hole.

In an optional embodiment of the present invention, the linear motion mechanism further includes a circuit board fixed on the positioning sleeve;

a diode connected with the microswitch in parallel is arranged on the circuit board; and

two connecting wires are welded on the circuit board.

In an alternative embodiment of the present invention, the linear motion mechanism further comprises a terminal gear in threaded engagement with the lead screw, a gear box in driving connection with the terminal gear, and a motor for driving the gear box to operate.

In an alternative embodiment of the present invention, one of the two connection wires is electrically connected to an external power source, and the other is electrically connected to the motor.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects: the linear motion mechanism of the utility model triggers the sensing element by the positioning piece arranged on the screw rod, and then controls the on-off of the motor by the sensing element. So need not be realized with the stifled commentaries on classics of outer tube by the tip of screw like the structure that adopts among the prior art promptly, just also can avoid screw and outer tube stifled commentaries on classics back, the screw produces and breaks away from or even cracked risk, can also avoid the motor stifled problem that changes and generate heat easily simultaneously.

In addition, the sensing element is directly arranged on the outer side wall of the outer tube, so that the detection device is convenient to overhaul and does not occupy the space inside the outer tube compared with a structure arranged inside the outer tube. The contact between the microswitch and the positioning piece is realized by arranging the positioning hole which is communicated with the inside and the outside of the outer pipe on the side wall of the outer pipe, and the simple positioning hole structure cannot cause the complexity of the whole structure of the outer pipe, so that the cost of the outer pipe cannot be increased.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic overall structure diagram of a linear motion mechanism provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating the cooperation of the microswitch of the linear motion mechanism with the positioning sleeve and the circuit board according to the embodiment of the present invention;

FIG. 3 illustrates a schematic cross-sectional view of a linear motion mechanism provided by an embodiment of the present invention;

FIG. 4 illustrates a partially exploded view of a linear motion mechanism provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a fully retracted state of a lead screw of the linear motion mechanism provided by the embodiment of the utility model;

FIG. 6 is a schematic diagram illustrating a fully extended state of a lead screw of the linear motion mechanism provided in an embodiment of the present invention;

fig. 7a and 7b are a schematic structural diagram and a switching circuit diagram of the motor of the linear motion mechanism provided by the embodiment of the utility model when the motor is retracted;

FIGS. 8a and 8b are a schematic diagram and a switch circuit diagram of the micro-switch contacting with the flat gasket when the motor of the linear motion mechanism provided by the embodiment of the utility model is operated;

fig. 9a and 9b are a schematic structural diagram and a switching circuit diagram of a linear motion mechanism provided by an embodiment of the utility model when a switching circuit is turned on;

fig. 10a and 10b show a schematic structural diagram and a switch circuit diagram of the linear motion mechanism provided by the embodiment of the utility model when the screw rod is gradually extended.

In the figure: the device comprises an outer tube 1, a screw rod 2, a positioning hole 11, a microswitch 3, a screw rod mounting hole 21, an outer tube mounting hole 12, an accommodating cavity 13, a motor 4, a tail end gear 5, a gear box 6, a positioning sleeve 7, a knurled rivet 71, a hollow rivet 72, a circuit board 8, a connecting wire 81, a diode 9, a flat gasket 101, a screw 102 and an elastic gasket 103.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Referring to fig. 1 to 10, the present embodiment provides a linear motion mechanism including: the device comprises an outer tube 1, a screw rod 2 partially extending into the outer tube 1, a positioning piece arranged on the screw rod 2, at least one sensing element and at least one positioning hole 11 arranged on the side wall of the outer tube 1. Wherein, the end of the screw rod 2 extending out of the outer tube 1 is provided with a screw rod mounting hole 21, and the end part of the outer tube 1 far away from the screw rod mounting hole 21 is provided with an outer tube mounting hole 12.

Referring next to the drawings, in a specific alternative embodiment, an outer tube 1 having a hollow receiving cavity 13; a screw rod 2 partially inserted in the accommodation chamber 13 and adapted to make a linear reciprocating motion; here, for the driving force of the linear reciprocating motion of the screw 2, the present embodiment employs an end gear 5 screw-coupled with the screw 2, a gear box 6 drivingly connected with the end gear 5, and a motor 4 for driving the gear box 6 to operate. The gearbox 6 here serves both for transmission and reduction. The inner hole of the terminal gear 5 matched and connected with the screw rod 2 is provided with internal threads, the internal threads and the screw rod 2 form spiral transmission, and the motor 4 is positioned outside the box body of the gear box 6 and is in threaded connection with the box body.

In addition, the embodiment is exemplified by providing two sensing elements in combination with the drawings, and the triggering effect of the sensing elements at two different positions is realized by the linear motion of the positioning member along with the screw rod 2. For the two sensing elements here, the two sensing elements are alternatively adapted to sense the extreme positions of the extended and retracted states of the screw rod 2 in the linear reciprocating motion, where the extreme position at the time of extension specifically refers to the longest extended position of the screw rod 2 during extension, and the extreme position at the time of retraction specifically refers to the position of the screw rod 2 during retraction, where the screw rod 2 retracts to the deepest position in the accommodating cavity 13.

The positioning element of the present embodiment is fixedly disposed on the end of the screw rod 2 disposed in the accommodating cavity 13, and the sensing element is disposed on the outer sidewall of the outer tube 1. The positioning element here mainly serves as a trigger for the sensing element. This embodiment directly sets up the sensing element on the lateral wall of outer tube 1, so compare the structure that sets up inside outer tube 1, it is convenient to overhaul, and does not occupy the inside space of outer tube 1.

And the triggering fit between the positioning piece and the sensing element is realized by the following steps:

two positioning holes 11 which are matched with the two sensing elements in a one-to-one correspondence mode are arranged on the tube wall of the outer tube 1, and the positioning holes 11 penetrate through the tube wall of the outer tube 1 so that the inner side and the outer side of the outer tube 1 can be communicated through the positioning holes 11. The sensing head of the sensing element of the present embodiment passes through the positioning hole 11 and then extends into the accommodating cavity 13 to achieve contact fit with the positioning member. When the positioning member moves to the position of the positioning hole 11 in the process of linear reciprocating motion of the positioning member along with the screw rod 2, the positioning member can contact with the sensing element to trigger the sensing element.

In an alternative implementation, the sensing element of the present embodiment employs a microswitch 3; the contact piece of the specific microswitch 3 passes through the positioning hole 11 and then extends into the accommodating cavity 13 to realize the contact matching with the positioning piece.

With reference to the accompanying drawings, the microswitch 3 of the present embodiment is positioned by the following structure: and a positioning sleeve 7 for assembling and fixing the microswitch 3 is arranged on the outer side wall of the outer tube 1 corresponding to the positioning hole 11. Namely, the positioning sleeve 7 is assembled at a position just covering the positioning hole 11, so that foreign dust outside the outer tube 1 does not enter the accommodating cavity 13 through the positioning hole 11. Under this kind of structure, set up the perforation that the contact that is suitable for micro-gap switch 3 passes on position sleeve 7, position sleeve 7 can not influence micro-gap switch 3 promptly the contact stretch into to holding in the chamber 13, can also realize simultaneously to micro-gap switch 3 fixed.

The positioning sleeve 7 of the present embodiment is connected with the outer tube 1 by, for example, but not limited to, a knurled rivet 71; the retaining sleeve 7 is attached to the microswitch 3 using, for example but not limited to, a hollow rivet 72.

It should be further noted that the linear motion mechanism of the present embodiment further includes a circuit board 8 fixed on the positioning sleeve 7; a diode 9 connected with the microswitch 3 in parallel is arranged on the circuit board 8; two connecting wires 81 are also welded to the circuit board 8. In detail, the circuit board 8 is soldered to two pins of the micro switch 3, and the diode 9 is also soldered to two pins of the micro switch 3. Two holes are formed in the circuit board 8 and correspond to the two pins of the micro switch 3 respectively, two connecting wires 81 are welded on the two holes, one connecting wire 81 of the two connecting wires 81 is electrically connected with an external power supply, and the other connecting wire 81 is electrically connected with the motor 4 to form a final switch circuit. When the screw rod 2 moves towards the direction of the outer pipe mounting hole 12, the flat gasket 101 touches the micro switch 3, so that the switch circuit is broken, and the screw rod 2 stops rotating. When the screw rod 2 needs to move reversely, the positive electrode and the negative electrode of the external power supply are switched, and the screw rod 2 moves towards the opposite direction.

This embodiment realizes the linking cooperation between micro-gap switch 3 and connecting wire 81 through the circuit board 8 that sets up for connecting wire 81 need not directly weld with micro-gap switch 3 again. The advantage of this design is that diode 9 is already soldered to the pin of micro-switch 3, and if the connection 81 is soldered to micro-switch 3 on this basis, there is a risk of cold solder joint. Therefore, the present embodiment can avoid the above-mentioned risk of cold joint by adding the wiring board 8 and indirectly soldering the connection wire 81 and the diode 9 through the wiring board 8.

In the embodiment, the positioning piece is arranged on the screw rod 2, the sensing element is triggered by the positioning piece, and the on-off of the motor 4 is controlled by the sensing element. So need not be realized with the stifled commentaries on classics of outer tube 1 by the tip of screw like the structure that adopts among the prior art promptly, just also can avoid screw and outer tube 1 stifled back of changeing, the screw production breaks away from or even cracked risk, can also avoid the problem that motor 4 stifled commentaries on classics generated heat easily simultaneously.

Finally, regarding the positioning member of the present embodiment, in order to facilitate the positioning member to move synchronously with the screw rod 2, the positioning member of the present embodiment adopts a ring-shaped structural body. In an alternative embodiment, the positioning member of the present embodiment is a flat gasket 101.

In view of convenience of assembly, the flat washer 101 of the present embodiment is fixed to the lead screw 2 by a screw 102. Specifically, a threaded hole suitable for inserting the screw 102 is formed in the end portion of the screw rod 2 extending into the accommodating cavity 13, a through hole suitable for the screw 102 to pass through is formed in the flat gasket 101, and the flat gasket 101 is clamped and limited between the nut of the screw 102 and the end portion of the screw rod 2 in the process that the screw 102 is matched and connected with the threaded hole, so that the flat gasket 101 is locked and limited to prevent the flat gasket 101 from loosening in the using process.

On the basis of the structure, an elastic gasket 103 sleeved on the screw is further arranged between the nut of the screw and the flat gasket 101. The locking effect of the nut of the screw on the flat washer 101 can be further increased by the provision of the spring washer 103.

In summary, the specific implementation principle of the linear motion mechanism of the present embodiment is as follows:

the distance between the screw rod mounting hole 21 and the outer tube mounting hole 12 is set to be a.

The screw rod mounting hole 21 and the outer tube mounting hole 12 are both mounting positions of the linear motion mechanism of the embodiment in a practical application process, when the motor 4 operates and the screw rod 2 retracts towards the outer tube 1, the screw rod is in a retracted state of the motor 4, and a dimension a1 in the drawing is a minimum mounting dimension of the motor 4. When the motor 4 runs in the reverse direction, the motor 4 is in an extended state when the distance between the screw rod mounting hole 21 and the outer tube mounting hole 12 is longer and longer, and the size a2 in the figure is the maximum mounting size of the motor 4.

Fig. 7a and 7b show the retracted state of the motor 4 (F shows the movement trend of the screw rod 2), the microswitch 3 is not in contact with the flat gasket 101 on the screw rod 2, the microswitch 3 is normally closed, a closed loop is formed, and the motor 4 is normally retracted.

As shown in fig. 8a and 8b, when the motor 4 is running, the flat pad 101 carried by the screw rod 2 contacts the micro switch 3, and the micro switch 3 is turned off. The diode 9 is a one-way conduction component, at the moment, the diode 9 is not conducted, the whole switching circuit is disconnected, and the motor 4 stops running. The distance between the screw rod mounting hole 21 and the outer tube mounting hole 12 is the minimum mounting dimension a 1.

When the screw 2 needs to be extended, the motor 4 must switch the positive and negative polarities as shown in fig. 9a and 9 b. At this time, the flat pad 101 and the microswitch 3 are still in contact, and the microswitch 3 is still in an off state. However, at this time, the diode 9 is in a conducting state, so that after the power supply switches the positive electrode and the negative electrode, the switch circuit is still closed, the motor 4 operates normally, and the screw rod 2 moves in the opposite direction.

As shown in fig. 10a and 10b, when the motor 4 is operated and the screw rod 2 moves in the opposite direction, the flat gasket 101 at the end of the screw rod 2 is separated from the microswitch 3, the microswitch 3 is in a normally closed state again, but the switch circuit at the moment is not affected, and the motor 4 still normally operates until the stroke of the screw rod mounting hole 21 and the outer tube mounting hole 12 is maximum, namely a 2.

For the linear motion mechanism of this embodiment, the linear motion mechanism for different products needs different minimum installation distances a, only the position of the micro switch 3 needs to be changed, the screw rod 2 and the outer tube 1 do not need to be redesigned, and the outer tube 1 only needs to be changed into the corresponding positioning hole 11 of the micro switch 3, and the overall length of the outer tube 1 does not need to be changed.

The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims

1. A linear motion mechanism, comprising:

an outer tube having a hollow receiving cavity;

the sensing element is arranged on the outer side wall of the outer tube;

2. The linear motion mechanism of claim 1, wherein the positioning member is a flat washer having an annular configuration.

3. The linear motion mechanism of claim 2, wherein the flat washer is fixed to the lead screw by a screw.

4. The linear motion mechanism of claim 3, wherein an elastic washer is disposed between the nut of the screw and the flat washer, and the elastic washer is disposed around the screw.

5. The linear motion mechanism as claimed in claim 1, wherein two positioning holes are provided at intervals on the tube wall of the outer tube; and

6. The linear motion mechanism of any one of claims 1 or 5, wherein the sensing element is a micro switch; and

7. The linear motion mechanism as claimed in claim 6, wherein a positioning sleeve for assembling and fixing the micro switch is provided on the outer side wall of the outer tube corresponding to the positioning hole.

8. The linear motion mechanism of claim 7 further comprising a circuit board secured to the positioning sleeve;

two connecting wires are welded on the circuit board.

9. The linear motion mechanism of claim 8 further comprising a final gear threadably coupled to the lead screw, a gear box drivingly connected to the final gear, and a motor for driving the gear box.

10. The linear motion mechanism of claim 9 wherein one of the two connecting wires is electrically connected to an external power source and the other is electrically connected to a motor.