A pen-type push rod built-in travel switch structure
By designing the reciprocating movement of the screw rod and the screw nut in the pen push rod, the stroke switch is turned on and off, and the problems of complex structure and high manufacturing cost of built-in stroke switches in the small and medium-sized state-of-the-art push rod are solved, and the problem of the complex structure and high manufacturing cost of built-in stroke switches in the existing technology is realized. A compact and easy-to-install built-in stroke switch structure.
Patent Information
- Application Number
- CN202011497292.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-17
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2040-12-17
AI Technical Summary
The built-in stroke switch with small and medium diameters in existing pen push rods is complex in structure and difficult to install, and has high production and manufacturing costs.
A built-in stroke switch structure including a screw rod, a screw nut and at least two stroke switches is designed. The stroke switch is turned on and off by the reciprocating movement of the screw rod nut and the contact end of the connecting rod. The overall structure is compact and simple.
It realizes simple setting and low production cost of built-in stroke switch in small diameter pen push rods. The overall structure is compact, meeting the volume requirements of pen push rods.
Smart Images
Figure CN112435878B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of travel switches, in particular to a pen-type push rod built-in travel switch structure. Background Art
[0002] Currently, most of the smaller diameter pen-type push rods on the market do not have built-in travel switches. Generally, the travel switches are set on the outside of the pen-type push rods. Some built-in structures with built-in travel switches have complex layouts, are difficult to install, and have high production costs. Summary of the Invention
[0003] In view of the above problems existing in the prior art, the present invention aims to provide a pen-type push rod with a built-in travel switch structure, in which a travel switch is built into a pen-type push rod with a small diameter, and the structure is simple and easy to set up.
[0004] The specific technical solutions are as follows:
[0005] A pen-type push rod with a built-in travel switch structure mainly comprises a lead screw, a lead screw nut and at least two travel switches.
[0006] The screw rod is connected to the driver and can rotate around its axis.
[0007] The screw nut matches the screw, is sleeved on the screw, and can move back and forth along the axial direction of the screw.
[0008] It includes a first travel switch and a second travel switch, which are respectively arranged on the circumferential outside of the screw rod and electrically connected to the driver, wherein the first travel switch is connected to a first connecting rod, and a first contact end is provided at the end of the first connecting rod facing away from the first travel switch, and the first contact end is electrically connected to the first travel switch, and the second travel switch is connected to a second connecting rod, and a second contact end is provided at the end of the second connecting rod facing away from the second travel switch, and the second contact end is electrically connected to the second travel switch; the first connecting rod and the second connecting rod are both arranged along the axial direction of the screw rod and have different lengths, and in addition, the screw rod nut can respectively contact the first contact end and the second contact end during the reciprocating movement.
[0009] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics: the projection range of the first connecting rod and the second connecting rod in the direction of the screw axis is outside the projection range of the screw nut in the direction of the screw axis, and the projection range of the first contact end and the second contact end in the direction of the screw axis is partially or completely within the projection range of the screw nut in the direction of the screw axis.
[0010] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics: the projection range of the first connecting rod and the second connecting rod in the direction of the screw axis is within the projection range of the screw nut in the direction of the screw axis, and the projection range of the first contact end and the second contact end in the direction of the screw axis is within the projection range of the screw nut in the direction of the screw axis.
[0011] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics: the first connecting rod is longer than the second connecting rod, a through hole is opened on the axial edge of the screw nut, and the first connecting rod is inserted into the through hole.
[0012] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics, and further includes a switch fixing block, which is sleeved on the outside of the connection between the screw rod and the driver, and the travel switch is housed on the inside of the switch fixing block.
[0013] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics, and further includes a bearing, which is sleeved on the outside of the screw rod, and a detachable bearing fixing ring is installed on the outside of the bearing.
[0014] The above-mentioned pen-type push rod with built-in travel switch structure also has the characteristic that one axial side of the bearing fixing ring is connected to one axial side of the switch fixing block.
[0015] The above-mentioned pen-type push rod with a built-in travel switch structure also has the following characteristics: the axial edge of the bearing fixing ring is provided with a clamping rib, and the axial edge of the switch fixing block is provided with a clamping groove matching the clamping rib; or the axial edge of the bearing fixing ring is provided with a clamping groove, and the axial edge of the switch fixing block is provided with a clamping rib matching the clamping groove.
[0016] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics, and further includes a power cut-off block, a power cut-off block is provided between the first travel switch and the first connecting rod, and a power cut-off block is provided between the second travel switch and the second connecting rod.
[0017] The above-mentioned pen-type push rod with built-in travel switch structure also has the following characteristics: it also includes a coupling, the movable part of the driver is connected to one end of the screw rod through the coupling, and the driver is a motor.
[0018] The positive effects of the above technical solution are:
[0019] The present invention provides a pen-type push rod with a built-in travel switch structure, in which at least two connecting rods are arranged along the length direction of the lead screw, and the connecting rods are close to or pass through the lead screw nut. The end of the connecting rod is contacted by the displacement of the lead screw nut to realize the on and off of each travel switch. The overall structure is compact and the arrangement is simple, and the overall production and manufacturing cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic structural diagram of an embodiment of a pen-type push rod built-in travel switch structure of the present invention;
[0021] Figure 2 It is a front view of an embodiment of a pen-type push rod built-in travel switch structure of the present invention;
[0022] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.
[0023] 1. Driver; 2. Screw; 3. Screw nut; 4. First travel switch; 5. Second travel switch; 6. Coupling; 7. First connecting rod; 71. First contact end; 8. Second connecting rod; 81. Second contact end; 9. Switch fixing block; 10. Bearing fixing ring; 11. Bearing. DETAILED DESCRIPTION
[0024] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the following embodiments are combined with the attached Figure 1 To the attached Figure 3 The invention provides a pen-type push rod with a built-in travel switch structure that is specifically described.
[0025] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.
[0026] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0027] In the pen-type push rod built-in travel switch structure, the screw rod 2 is connected to the driver 1, and the screw rod 2 can rotate around its axial direction. Specifically, the rotation of the screw rod 2 is driven by the rotation of the movable part of the driver 1, wherein the screw rod 2 and the driver 1 are in the same straight line, and the length directions of the two are consistent.
[0028] The screw nut 3 matches the screw rod 2, that is, the threads of the two are adapted. The screw nut 3 is sleeved on the screw rod 2, and the screw nut 3 can move back and forth along the axial direction of the screw rod 2. Specifically, the end of the screw rod 2 close to the driver 3 is defined as the proximal end of the screw rod 2, and the end of the screw rod 2 away from the driver 1 is defined as the distal end of the screw rod 2. The axial direction of the screw rod 2 remains stationary. When the screw rod 2 rotates clockwise or counterclockwise, the screw nut 3 also rotates and displaces along the length direction of the screw rod 2. The screw nut 3 can move from the proximal end of the screw rod 2 to the distal end of the screw rod 2, and can also move from the distal end of the screw rod 2 to the proximal end.
[0029] The travel switch includes a first travel switch 4 and a second travel switch 5, which correspond to different travel distances respectively and are respectively arranged on the circumferential outside of the screw rod 2. Since the pen-type push rod is relatively thin as a whole, the travel switch is close to the screw rod 2, and the travel switch is electrically connected to the driver 1. The rotation direction of the driver 2 can be changed by the signal received by the travel switch, wherein the first travel switch 4 is connected to the first connecting rod 7, and the end of the first connecting rod 7 facing away from the first travel switch 4 is provided with a first contact end 71. Generally, the cross-section of the first contact end 71 is larger than the cross-section of the first connecting rod 7. The first contact end 71 is electrically connected to the first travel switch 4, that is, when the screw nut 3 contacts the first contact end 71, the first contact end 71 transmits the contact signal to the first travel switch 4. The second limit switch 5 is connected to the second connecting rod 8, and the second contact end 81 is provided at the end of the second connecting rod 8 facing away from the second limit switch 5. Generally, the cross-section of the second contact end 81 is larger than the cross-section of the second connecting rod 8. The second contact end 81 is electrically connected to the second limit switch 5, that is, when the screw nut 3 comes into contact with the second contact end 81, the second contact end 81 transmits the contact signal to the second limit switch 5.
[0030] The first connecting rod 7 and the second connecting rod 8 are both arranged along the axial direction of the screw rod 2 and have different lengths. Specifically, the direction in which the first limit switch 4 points to the first contact end 71 is defined as the first direction of the first connecting rod 7, and the direction in which the second limit switch 5 points to the second contact end 81 is defined as the second direction of the second connecting rod 8, wherein the first direction is the same as or opposite to the second direction. In addition, the screw nut 3 can contact the first contact end 71 and the second contact end 81 respectively during the reciprocating movement. After the screw nut 3 contacts the first contact end 71 or the second contact end 81, the screw rod 2 stops rotating, the screw nut 3 stops displacing, and the screw nut 3 stays at the extreme position. When the screw nut 3 stops and starts the next displacement, the rotation direction of the screw rod 2 is opposite to the rotation direction of the screw nut 3 before it stops displacing.
[0031] In a preferred embodiment, Figures 1 to 3 As shown, the projection range of the first connecting rod 7 and the second connecting rod 8 in the axial direction of the screw rod 2 is outside the projection range of the screw nut 3 in the axial direction of the screw rod 2, that is, the first connecting rod 7 and the second connecting rod 8 are located radially outside the screw nut 3, but very close to the screw nut 3, so as to ensure that the radial length of the pen-type push rod is as small as possible to reduce the overall volume, and the projection range of the first contact end 71 and the second contact end 81 in the axial direction of the screw rod 2 is partially or completely within the projection range of the screw nut 3 in the axial direction of the screw rod 2, so as to ensure that the screw nut 3 can make contact with the first contact end 71 and the second contact end 81 during the movement.
[0032] In a preferred embodiment, Figures 1 to 3 As shown, the projection range of the first connecting rod 7 and the second connecting rod 8 in the axial direction of the screw rod 2 is within the projection range of the screw nut 3 in the axial direction of the screw rod 2, that is, the longer one of the first connecting rod 7 and the second connecting rod 8 passes through the screw nut 3, that is, the first connecting rod 7 and the second connecting rod 8 will not occupy additional radial space. This structural design can meet the volume requirements of the pen-type push rod to ensure that the overall volume of the pen-type push rod is small. The projection range of the first contact end 71 and the second contact end 81 in the axial direction of the screw rod 2 is within the projection range of the screw nut 3 in the axial direction of the screw rod 2, so as to ensure that the screw nut 3 can make contact with the first contact end 71 and the second contact end 81 during movement, and cut off the power supply through contact.
[0033] Specifically, the first connecting rod 7 is longer than the second connecting rod 8, and a through hole is opened on the axial edge of the screw nut 3, and the first connecting rod 7 is passed through the through hole. Furthermore, the diameter of the through hole is larger than the diameter of the first connecting rod 7 and smaller than the diameter of the first contact end 71, that is, the screw nut 3 does not contact the first connecting rod 7 during the displacement process, and can slide relative to the first connecting rod 7, and the first contact end 71 can come into contact with the end face of the screw nut 3.
[0034] In a preferred embodiment, Figures 1 to 3 As shown, it also includes a switch fixing block 9, which is sleeved on the outside of the connection between the screw rod 2 and the driver 1, and the travel switch is housed on the inner side of the switch fixing block 9. The first travel switch 4 and the second travel switch 5 are fixed by the switch fixing block 9. The first travel switch 4 and the second travel switch 5 can rotate with the switch fixing block 9. In addition, the switch fixing block 9 can also be used to protect the first travel switch 4 and the second travel switch 5.
[0035] In a preferred embodiment, Figures 1 to 3 As shown, the invention also includes a bearing 11, which is sleeved on the outside of the screw rod 2, and a detachable bearing fixing ring 10 is installed on the outside of the bearing 11. Specifically, the bearing 11 can be a ball bearing.
[0036] In a preferred embodiment, Figures 1 to 3 As shown, one axial side of the bearing fixing ring 10 is connected to one axial side of the switch fixing block 9. Specifically, a snap-on connection can be adopted to ensure that the two can remain relatively stationary during axial rotation. In addition, bonding or threaded fastener connection can also be adopted. Furthermore, the bearing fixing ring 10 can be divided into two parts and then assembled on the outside of the bearing 11.
[0037] In a preferred embodiment, Figures 1 to 3 As shown, the axial edge of the bearing fixing ring 10 is provided with a clamping rib, and the axial edge of the switch fixing block 9 is provided with a clamping groove matching the clamping rib; or the axial edge of the bearing fixing ring 10 is provided with a clamping groove, and the axial edge of the switch fixing block 9 is provided with a clamping rib matching the clamping groove. The clamping form is simpler and easier to disassemble later. Of course, the form can also be used for connection, and then the rotation of the switch fixing block 9 and the first travel switch 4 and the second travel switch 5 is driven by the rotation of the bearing fixing ring 10.
[0038] In a preferred embodiment, Figures 1 to 3 As shown, it also includes a power cut-off block. A power cut-off block is provided between the first limit switch 4 and the first connecting rod 7. When the lead screw nut 3 contacts the first contact end 71, the first contact end 71 transmits the contact signal to the power cut-off block through the first connecting rod 7, and then the driver 1 stops rotating through the first limit switch 4; a power cut-off block is provided between the second limit switch 5 and the second connecting rod 8. When the lead screw nut 3 contacts the second contact end 81, the second contact end 81 transmits the contact signal to the power cut-off block through the second connecting rod 8, and then the driver 1 stops rotating through the second limit switch 5. Furthermore, the power cut-off block is arranged along the circumference of the lead screw 2 to reduce the circumferential volume of the pen-type push rod as much as possible to meet the volume requirement of the pen-type push rod.
[0039] In a preferred embodiment, Figures 1 to 3 As shown, it also includes a coupling 6. The movable part of the driver 1 is connected to one end of the screw rod 2 through the coupling 6. The structure is simple, and the rotation of the screw rod 2 is driven by the rotation of the movable part of the driver 1. Preferably, the driver 1 can be a motor to meet the compact overall structure of the pen-type push rod.
[0040] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0041] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.
Claims
1. A pen-type push rod with a built-in travel switch structure, It is characterized in that include: A screw rod, which is drivingly connected to the driver and can rotate around its axis; A screw nut, the screw nut matches the screw, the screw nut is sleeved on the screw, and the screw nut can reciprocate along the axial direction of the screw; At least two travel switches, including a first travel switch and a second travel switch, are respectively arranged on the circumferential outer side of the lead screw and are electrically connected to the driver, wherein the first travel switch is connected to a first connecting rod, and the end of the first connecting rod away from the first travel switch is provided with a first contact end, and the first contact end is electrically connected to the first travel switch, and the second travel switch is connected to a second connecting rod, and the end of the second connecting rod away from the second travel switch is provided with a second contact end, and the second contact end is electrically connected to the second travel switch; the first connecting rod and the second connecting rod are both arranged along the axial direction of the lead screw and have different lengths, and the lead screw nut can contact the first contact end and the second contact end respectively during the reciprocating movement; The first contact end transmits a contact signal to the first travel switch; The second contact end transmits the contact signal to the second travel switch; It also includes a switch fixing block, which is sleeved on the outer side of the connection between the lead screw and the driver, and the travel switch is received on the inner side of the switch fixing block.
2. A pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that The projection range of the first connecting rod and the second connecting rod in the direction of the screw axis is outside the projection range of the screw nut in the direction of the screw axis, and the projection range of the first contact end and the second contact end in the direction of the screw axis is partially within the projection range of the screw nut in the direction of the screw axis.
3. A pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that The projection range of the first connecting rod and the second connecting rod in the direction of the screw axis is within the projection range of the screw nut in the direction of the screw axis, and the projection range of the first contact end and the second contact end in the direction of the screw axis is within the projection range of the screw nut in the direction of the screw axis.
4. A pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that The first connecting rod is longer than the second connecting rod, a through hole is formed on the axial edge of the screw nut, and the first connecting rod is inserted into the through hole.
5. The pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that It also includes a bearing, which is sleeved on the outer side of the screw rod, and a detachable bearing fixing ring is installed on the outer side of the bearing.
6. A pen-type push rod built-in travel switch structure according to claim 5, It is characterized in that One axial side of the bearing fixing ring is connected to one axial side of the switch fixing block.
7. A pen-type push rod built-in travel switch structure according to claim 6, It is characterized in that The axial edge of the bearing fixing ring is provided with a clamping rib, and the axial edge of the switch fixing block is provided with a clamping groove matching the clamping rib; or the axial edge of the bearing fixing ring is provided with a clamping groove, and the axial edge of the switch fixing block is provided with a clamping rib matching the clamping groove.
8. The pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that It also includes a power cut-off block, which is arranged between the first travel switch and the first connecting rod, and the power cut-off block is arranged between the second travel switch and the second connecting rod.
9. The pen-type push rod built-in travel switch structure according to claim 1, It is characterized in that It also includes a coupling, through which the movable part of the driver is connected to one end of the screw rod, and the driver is a motor.