CN112897394A - Lead screw with upper limit switch and lower limit switch - Google Patents
Lead screw with upper limit switch and lower limit switch Download PDFInfo
- Publication number
- CN112897394A CN112897394A CN202110252942.9A CN202110252942A CN112897394A CN 112897394 A CN112897394 A CN 112897394A CN 202110252942 A CN202110252942 A CN 202110252942A CN 112897394 A CN112897394 A CN 112897394A
- Authority
- CN
- China
- Prior art keywords
- limit switch
- upper limit
- lower limit
- rod
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
- B66F7/12—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks
- B66F7/14—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by mechanical jacks screw operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/16—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through bevel-wheel gearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/04—Jacks with screw and nut
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Mechanisms For Operating Contacts (AREA)
Abstract
The invention relates to a screw rod with an upper limit switch and a lower limit switch, which comprises an upper part and a lower part which are connected through a threaded rod, wherein a first gear and a second gear are arranged at the end part of the threaded rod and are meshed; the screw rod is provided with an upper limit switch and a lower limit switch, the upper limit switch comprises a blocking piece, an upper limit switch assembly and a sliding seat, and an upper limit displacement moving rod and a pressing rod are arranged on the sliding seat; the upper limit switch assembly comprises an upper limit microswitch which is provided with an upper limit contact piece; lower limit switch includes ejector pin and lower limit switch subassembly, and lower limit switch subassembly moves the pole including lower limit micro-gap switch and lower limit displacement, and lower limit micro-gap switch is equipped with down the limit switch bump, and lower limit displacement moves the pole and is provided with wide portion and narrow portion, connects through the slope between wide portion and the narrow portion. The invention has simple structure, high sensitivity and almost zero failure rate, and makes contribution to realizing stable lifting and effective limiting of the lifting platform.
Description
Technical Field
The invention relates to a screw rod, in particular to a screw rod with an upper limit switch and a lower limit switch, which is mainly used for lifting a lifting platform.
Background
The lead screw is a core component in the lifting platform, and the quality and the function of the lead screw relate to the problems of whether the lifting of the lifting platform is stable, whether mute lifting can be realized and the like. Therefore, to realize the superiority of lift platform, the first task is to seek a lead screw with superior performance. However, the stroke limit in the screw rod is a technical problem in the prior art, and the stroke limit switch in the prior art has a complex structure, is difficult to install, has low sensitivity and a high failure rate, often has the situation of no timely limit, causes excessive stroke, and cannot obtain satisfactory user experience.
Therefore, the development of the lead screw with the travel limit switch, which has the advantages of simple structure, convenience in installation, high sensitivity and low failure rate, is a main development direction of technicians in the field at the present stage.
The present invention has been made based on this.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the screw rod with the upper limit switch and the lower limit switch, the upper limit switch and the lower limit switch are simple in structure, high in sensitivity and almost zero in failure rate during lifting, and contribution is made to stable lifting and effective limiting of a lifting platform.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a screw rod with an upper limit switch and a lower limit switch comprises an upper portion and a lower portion of the screw rod which are connected through a threaded rod, wherein a first gear and a second gear are mounted at the end of the threaded rod and are meshed; the screw rod is provided with an upper limit switch and a lower limit switch, the upper limit switch comprises a blocking piece, an upper limit switch assembly and a sliding seat, the blocking piece is provided with a groove, the sliding seat is provided with an upper limit displacement moving rod and a pressing rod, the upper limit displacement moving rod extends into the groove, and the end part of the upper limit displacement moving rod is provided with an upper limit retainer; the upper limit switch assembly comprises an upper limit microswitch, the upper limit microswitch is provided with an upper limit contact piece, and the pressure rod is positioned above the upper limit contact piece; lower limit switch includes ejector pin and lower limit switch subassembly, lower limit switch subassembly includes that lower limit micro-gap switch moves the pole with lower limit displacement, lower limit micro-gap switch is equipped with down the limit switch bump, lower limit displacement moves the pole and is provided with wide portion and narrow part, connect through the slope between wide portion and the narrow part.
The upper part of the screw rod is provided with an upper seat body, the lower part of the screw rod is provided with a lower seat body, the upper limit switch assembly, the lower limit switch assembly and the sliding seat are arranged on the upper seat body, and the blocking piece and the ejector rod are arranged on the lower seat body; the upper limit switch assembly, the sliding seat and the blocking piece are located on one side of the screw rod, and the lower limit switch assembly and the ejector rod are located on the other side of the screw rod.
The upper seat body is provided with a fixed seat, and the upper limit microswitch is arranged on the fixed seat.
The end part of the upper limit displacement moving rod is provided with an upper limit spring, and the upper limit spring is positioned between the fixed seat and the sliding seat.
The lower part of the screw rod is provided with a slide rail, and the upper limit displacement moving rod slides in the slide rail.
The lower limit displacement moving rod is provided with a lower limit spring.
The lower limit displacement moving rod is provided with a lower limit body, and the lower limit displacement moving rod moves in the lower limit body.
The lower retainers are two, and the wide portion and the narrow portion are located between the two lower retainers.
The upper seat body is provided with a through hole, and when the lower limit switch is closed, the end part of the lower limit displacement moving rod extends out of the outer side of the through hole.
The invention has the following beneficial effects:
when the screw rod rises to the highest position, the upper limit micro switch can be effectively closed by pressing the upper limit contact piece down through the pressing rod, so that the screw rod stops moving and the lifting platform is prevented from rising again; when the lead screw descends to the lowest position, the lower limit microswitch can be effectively closed through the abutting pressure of the wide part on the lower limit switch salient point, so that the lead screw stops moving and the lifting platform is prevented from descending again. The invention has simple structure, high sensitivity and almost zero failure rate, and makes contribution to realizing stable lifting and effective limiting of the lifting platform.
Drawings
FIG. 1 is a schematic view of the internal structure of a screw according to the present invention;
FIG. 2 is a schematic diagram of the open state of the upper limit switch in the present invention;
FIG. 3 is a schematic diagram of the closed state of the upper limit switch in the present invention; a
FIG. 4 is a schematic diagram of an open state of a lower limit switch according to the present invention;
FIG. 5 is a schematic diagram of the off state of the lower limit switch in the present invention;
wherein, 1 is a threaded rod, 2 is an upper part of the screw rod, 3 is a lower part of the screw rod, 4 is a first gear, 5 is a second gear, 6 is a blocking piece, 7 is a sliding seat, 8 is a groove, 9 is an upper limit displacement moving rod, 10 is a pressure rod, 11 is an upper limit body, 12 is an upper limit micro switch, 13 is an upper limit contact piece, 14 is a mandril, 15 is a lower limit micro switch, 16 is a lower limit displacement moving rod, 17 is a lower limit switch salient point, 18 is a wide part, 19 is a narrow part, 20 is a slope, 21 is an upper seat body, 22 is a lower seat body, 23 is a fixed seat, 24 is an upper limit spring, 25 is a sliding rail, 26 is a lower limit spring, and 27 is a lower limit.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
As shown in fig. 1-5, the screw rod with the upper limit switch and the lower limit switch of the invention comprises an upper part 2 and a lower part 3 of the screw rod which are connected through a threaded rod 1, a first gear 4 and a second gear 5 are arranged at the end part of the threaded rod 1, and the first gear 4 is meshed with the second gear 5; the screw rod is provided with an upper limit switch and a lower limit switch.
The upper part 2 of the screw rod is provided with an upper seat body 21, and the lower part 3 of the screw rod is provided with a lower seat body 22. Lower pedestal 22 is equipped with and blocks piece 6, blocks piece 6 and is equipped with groove 8, and upper base 21 is installed and is gone up limit switch subassembly and sliding seat 7, and upper base 21 installs fixing base 23, and last spacing micro-gap switch 12 is installed on fixing base 23. An upper limit displacement moving rod 9 and a pressure rod 10 are installed on the sliding seat 7, the upper limit displacement moving rod 9 extends into the groove 8, and an upper limit retainer 11 is arranged at the end part of the upper limit displacement moving rod 9; the other end of the upper limit displacement moving rod 9 is provided with an upper limit spring 24, and the upper limit spring 24 is positioned between the fixed seat 23 and the sliding seat 7. The upper limit switch assembly comprises an upper limit microswitch 12, the upper limit microswitch 12 is provided with an upper limit contact piece 13, and the pressure lever 10 is positioned above the upper limit contact piece 13.
The upper limit switch assembly, the lower limit switch assembly and the sliding seat 7 are arranged on the upper seat body 21, and the blocking piece 6 and the mandril 14 are arranged on the lower seat body 22; the upper limit switch assembly, the sliding seat 7 and the blocking piece 6 are positioned on one side of the screw rod, and the lower limit switch assembly and the ejector rod 14 are positioned on the other side of the screw rod.
In order to increase the sensitivity of the switch, the lower limit displacement moving rod 16 of the invention is provided with two lower limit retainers 27, the lower limit displacement moving rod 16 moves in the lower limit retainers 27, and the wide part 18 and the narrow part 19 are positioned between the two lower limit retainers 27, so that the wide part 18 and the narrow part 19 are limited, and the lower limit spring 26 is also limited.
When the screw rod device is used, the upper seat body 21 is arranged on the upper portion 2 of the screw rod, the lower seat body 22 is arranged on the lower portion 3 of the screw rod, the lower portion 3 of the screw rod further comprises a slide rail 25, and when the screw rod device is used, the upper limit displacement moving rod 9 slides in the slide rail 25.
When a user needs to lift the lifting platform, the upper limit displacement moving rod 9 slides in the sliding rail 25 along with the upward movement of the upper part 2 of the screw rod, after the upper limit retainer 11 slides to a certain distance, the upper limit retainer 11 is blocked by the blocking piece 6, so that the upper limit displacement moving rod 9 can not slide any more, at the moment, the sliding seat 7 is pulled downwards along with the continuous rising of the screw rod, the pressing rod 10 slowly approaches the upper limit contact piece 13, the pressing rod 10 presses the upper limit contact piece 13 until the upper limit spring 24 is pressed to the lowest position, the upper limit micro switch 12 is closed, the screw rod stops rising, and the lifting platform also stops rising.
When a user needs to descend the lifting platform, the upper portion 2 of the screw rod moves downwards, after the screw rod moves to a certain degree, one end of the lower limit displacement moving rod 16 is in contact with the ejector rod 14, along with the continuous movement of the upper portion 2 of the screw rod, the lower limit displacement moving rod 16 is pushed towards the direction of the lower limit spring 26 by the ejector rod 14, the slope 20 slowly contacts with the lower limit switch salient point 17, the lower limit displacement moving rod 16 continues to be pushed towards the direction of the lower limit spring 26 by the ejector rod 14, the lower limit switch salient point 17 reaches the wide portion 18 along the slope 20, the lower limit switch salient point 17 is pressed downwards through the wide portion 18, the switch is powered off, the screw rod reaches the lowest point, the lower limit spring 26 is compressed to the minimum.
The present invention has two ways of mounting the lower limit displacement moving rod 16: 1. the upper seat body 21 is provided with a through hole (not marked in the drawing of the invention), and when the lower limit switch is closed, the end part of the lower limit displacement moving rod 16 extends out of the through hole. 2. When the switch is turned on, the end of the lower limit displacement moving rod 16 has a certain distance with the upper seat body 21, and with the movement of the lower limit displacement moving rod 16, when the switch is turned off, one end of the lower limit displacement moving rod props against the upper seat body 21.
When the screw rod rises to the highest position, the upper limit contact piece 13 is pressed down through the pressure rod 10, the upper limit microswitch 12 can be effectively closed, so that the screw rod stops moving, and the lifting platform is prevented from rising again; when the screw rod descends to the lowest position, the lower limit microswitch 15 can be effectively closed by the abutting of the wide part 18 to the lower limit switch salient point 17, so that the screw rod stops moving and the lifting platform is prevented from descending again.
In the invention, the lower part 3 of the screw rod is provided with internal threads (not marked in the attached drawing of the invention), and the external threads of the threaded rod 1 are meshed with the internal threads. The second gear 5 is externally connected with a driving device, the first gear 4 is driven to rotate by driving the second gear 5, so that the up-and-down movement of the threaded rod 1 is realized,
the invention has simple structure, high sensitivity and almost zero failure rate, and makes contribution to realizing stable lifting and effective limiting of the lifting platform.
The above-mentioned embodiments are only used for explaining the inventive concept of the present invention, and do not limit the protection of the claims of the present invention, and any insubstantial modifications of the present invention using this concept shall fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a lead screw with go up limit switch and limit switch down which characterized in that: the screw rod comprises a screw rod upper part and a screw rod lower part which are connected through a screw rod, wherein a first gear and a second gear are mounted at the end part of the screw rod and are meshed; the screw rod is provided with an upper limit switch and a lower limit switch, the upper limit switch comprises a blocking piece, an upper limit switch assembly and a sliding seat, the blocking piece is provided with a groove, the sliding seat is provided with an upper limit displacement moving rod and a pressing rod, the upper limit displacement moving rod extends into the groove, and the end part of the upper limit displacement moving rod is provided with an upper limit retainer; the upper limit switch assembly comprises an upper limit microswitch, the upper limit microswitch is provided with an upper limit contact piece, and the pressure rod is positioned above the upper limit contact piece; lower limit switch includes ejector pin and lower limit switch subassembly, lower limit switch subassembly includes that lower limit micro-gap switch moves the pole with lower limit displacement, lower limit micro-gap switch is equipped with down the limit switch bump, lower limit displacement moves the pole and is provided with wide portion and narrow part, connect through the slope between wide portion and the narrow part.
2. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 1, wherein: the upper part of the screw rod is provided with an upper seat body, the lower part of the screw rod is provided with a lower seat body, the upper limit switch assembly, the lower limit switch assembly and the sliding seat are arranged on the upper seat body, and the blocking piece and the ejector rod are arranged on the lower seat body; the upper limit switch assembly, the sliding seat and the blocking piece are located on one side of the screw rod, and the lower limit switch assembly and the ejector rod are located on the other side of the screw rod.
3. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 2, wherein: the upper seat body is provided with a fixed seat, and the upper limit microswitch is arranged on the fixed seat.
4. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 1, wherein: the end part of the upper limit displacement moving rod is provided with an upper limit spring, and the upper limit spring is positioned between the fixed seat and the sliding seat.
5. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 1, wherein: the lower part of the screw rod is provided with a slide rail, and the upper limit displacement moving rod slides in the slide rail.
6. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 1, wherein: the lower limit displacement moving rod is provided with a lower limit spring.
7. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 2, wherein: the lower limit displacement moving rod is provided with a lower limit body, and the lower limit displacement moving rod moves in the lower limit body.
8. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 7, wherein: the method is characterized in that: the lower retainers are two, and the wide portion and the narrow portion are located between the two lower retainers.
9. The lead screw having an upper limit switch and a lower limit switch as set forth in claim 1, wherein: the method is characterized in that: the upper seat body is provided with a through hole, and when the lower limit switch is closed, the end part of the lower limit displacement moving rod extends out of the outer side of the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110252942.9A CN112897394A (en) | 2021-03-09 | 2021-03-09 | Lead screw with upper limit switch and lower limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110252942.9A CN112897394A (en) | 2021-03-09 | 2021-03-09 | Lead screw with upper limit switch and lower limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112897394A true CN112897394A (en) | 2021-06-04 |
Family
ID=76107054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110252942.9A Withdrawn CN112897394A (en) | 2021-03-09 | 2021-03-09 | Lead screw with upper limit switch and lower limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112897394A (en) |
-
2021
- 2021-03-09 CN CN202110252942.9A patent/CN112897394A/en not_active Withdrawn
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210604 |
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| WW01 | Invention patent application withdrawn after publication |