Height limit switch

Abstract

The utility model provides a height limit switch, which comprises a shell with an inner cavity, and a first through hole communicated with the inner cavity is formed in one side wall of the shell; the adapter plate is provided with a first adapter plate port and a second adapter plate port which are not communicated with each other, the first adapter plate port is connected with the first signal output and the fixed electrode, and the second adapter plate port is connected with the second signal output and the ejector pin; a core wire communicated with a second output signal is arranged in the first through hole; a switch rotating shaft is arranged at the other end of the inner cavity, one end of the ejector pin abuts against the switch rotating shaft, the switch rotating shaft rotates to push the ejector pin to make contact with the fixed electrode, and the first signal output and the second signal output are conducted; the ejector pin is sleeved with a reset spring, and an ejector pin soldering lug is arranged at the end, close to the adapter plate, of the ejector pin. One end of the reset spring abuts against the ejector pin soldering lug, the other end of the reset spring abuts against the ejector pin side wall, and under the action of the reset spring, disconnection of the ejector pin and the fixed electrode and disconnection of the first signal output and the second signal output are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of height limit switch of crane, especially relates to a height limit switch. BACKGROUND

[0002] Crane is the common equipment of industrial and mining enterprises, and the lifting mechanism of the crane is provided with a height limit switch in the lifting process to avoid safety accidents caused by the lifting device exceeding the safe position and continuing to rise. The height limit switch is a kind of safety protection device for limiting the lifting height of the crane.

[0003] The commonly used height limit switch is a heavy hammer type height limit switch, which is mostly lever type. When the heavy hammer freely droops, the limit switch is in the closed state of connecting power supply. When the lifting device rises to a certain position, the heavy hammer support on the hook assembly lifts the heavy hammer, causing the limit switch to act and cut off the power supply, and the hook assembly stops rising to avoid accidents.

[0004] The existing height limit switch has the problems of complex internal structure and inconvenient installation. UTILITY MODEL CONTENTS

[0005] In view of the defects in the prior art, the utility model provides a height limit switch, which comprises: a shell with an inner cavity, a first through hole communicated with the inner cavity is formed in one side wall of the shell;

[0006] One end of the inner cavity is provided with an adapter plate, the adapter plate is provided with a first adapter plate opening and a second adapter plate opening which are not conductive to each other, the first adapter plate opening is connected with a first signal output and a fixed electrode, and the second adapter plate opening is connected with a second signal output and a thimble;

[0007] A core wire communicated with the second output signal is arranged in the first through hole;

[0008] The other end of the inner cavity is provided with a switch rotating shaft, one end of the thimble abuts against the switch rotating shaft, the switch rotating shaft rotates, pushes the thimble to contact the fixed electrode, and the first signal output and the second signal output are conductive;

[0009] A reset spring is sleeved on the thimble, one end of the thimble near the adapter plate is provided with a thimble welding sheet, one end of the reset spring abuts against the thimble welding sheet, the other end of the reset spring abuts against the thimble side wall, under the action of the reset spring, the thimble and the fixed electrode are disconnected, and the first signal output and the second signal output are disconnected.

[0010] In one embodiment, the side wall of the switch rotating shaft is provided with a notch, and one end of the thimble is arranged in the notch.

[0011] In one of the embodiments, the adapter plate is provided with a guide hole, one end of the fixed electrode is inserted into one end of the guide hole, and one end of the ejector pin is inserted into the other end of the guide hole.

[0012] In one of the embodiments, the shell comprises a first shell and a second shell connected to each other, and the first shell and the second shell are connected by screws.

[0013] In one of the embodiments, opposite sides of the first shell and the second shell are provided with sealing grooves, and the sealing grooves are filled with sealant for waterproofing.

[0014] In one of the embodiments, the fixed electrode is arranged in the first shell.

[0015] In one of the embodiments, a step is arranged at one end of the ejector pin away from the ejector pin tab, and the step is used for limiting the reset spring.

[0016] Advantages of the utility model

[0017] The utility model provides a height limit switch, switch rotary shaft rotation promotes the ejector pin to advance, and the ejector pin contacts the fixed electrode, and first signal output and second signal output are conducted, under the elastic force of reset spring, the ejector pin is reset, and the ejector pin is disconnected with the fixed electrode, and first signal output and second signal output are disconnected, realize the switch function of height limit switch. The first shell and the second shell are waterproofed through the sealing groove and the sealant, and the waterproof performance is improved. The height limit switch of the utility model has small space, stable function, is easy to install and maintain, and has high precision and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the sectional view structure schematic diagram of the utility model;

[0019] Figure 2 It is the three-dimensional structure schematic diagram of one embodiment of the utility model;

[0020] Figure 3 It is Figure 1 The structure schematic diagram of switch rotary shaft of the embodiment;

[0021] Among them, 10, shell;11, first shell;12, second shell;13, screw;14, inner cavity;15, first through hole;16, switch rotary shaft;17, adapter plate;18, fixed electrode;19, ejector pin;20, core wire;21, reset spring;22, ejector pin tab;23, notch;24, step;25, guide hole. DETAILED DESCRIPTION

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] Reference Figures 1-3

[0024] This utility model provides a height limit switch, comprising: a housing 10 having an inner cavity 14, wherein a first through hole 15 communicating with the inner cavity 14 is formed on one side wall of the housing 10; an adapter plate 17 is provided at one end of the inner cavity 14, the adapter plate 17 being a PCB adapter plate; the adapter plate 17 is provided with a first adapter plate 17 port and a second adapter plate 17 port that are not mutually conductive, the first adapter plate 17 port connecting a first signal output and a fixed electrode 18, and the second adapter plate 17 port connecting a second signal output and a pin 19; a core wire 20 communicating with the second output signal is provided in the first through hole 15; and a switch knob is provided at the other end of the inner cavity 14. A rotating shaft 16 is used, with one end of the ejector pin 19 abutting against the rotating shaft 16. Rotation of the rotating shaft 16 pushes the ejector pin 19 into contact with the fixed electrode 18, activating the first and second signal outputs. A return spring 21 is fitted onto the ejector pin 19, and a ejector pin solder piece 22 is provided at one end of the ejector pin 19 near the adapter plate 17. The solder piece 22 is used to connect the ejector pin 19 to the core wire 20. One end of the return spring 21 abuts against the solder piece 22, and the other end abuts against the side wall of the ejector pin 19. Under the action of the return spring 21, the ejector pin 19 is disconnected from the fixed electrode 18, thus disconnecting the first and second signal outputs. This height limit switch has a small footprint and compact structure. The fixed electrode 18 and the ejector pin 19 achieve opening and closing through a mechanical structure, achieving a high-precision and high-reliability switching method.

[0025] In another embodiment, the switch rotation shaft 16 adopts a cam structure to push the ejector pin 19.

[0026] In one embodiment, the side wall of the switch rotating shaft 16 is provided with a notch 23, and one end of the ejector pin 19 is disposed in the notch 23. When the switch rotating shaft 16 rotates to the point where the notch 23 abuts against the ejector pin 19, the ejector pin 19 is disconnected from the fixed electrode 18 under the elastic force of the reset spring 21.

[0027] In one of the embodiments, the adapter plate 17 is provided with a guide hole, the fixed electrode 18 is inserted into one end of the guide hole, and one end of the ejector pin 19 is inserted into the other end of the guide hole, the guide block guides the movement direction of the ejector pin 19 close to or away from the fixed electrode 18, and the reliability is improved.

[0028] In one of the embodiments, the shell 10 comprises a first shell 11 and a second shell 12 connected to each other, and the first shell 11 and the second shell 12 are connected by screws 13, which is easy to install and maintain.

[0029] In one of the embodiments, the opposite sides of the first shell 11 and the second shell 12 are provided with sealing grooves, and the sealing grooves are filled with sealant for waterproofing.

[0030] In one of the embodiments, the fixed electrode 18 is arranged in the first shell 11, which is convenient for installation and maintenance.

[0031] In one of the embodiments, the ejector pin 19 is provided with a step 24 at the end away from the ejector pin pad 22, the step 24 is used for limiting the reset spring 21, the switch rotating shaft 16 rotates to push the ejector pin 19 to contact the fixed electrode 18, the reset spring 21 is in a compressed state, when the switch rotating shaft 16 rotates to the notch 23, the ejector pin 19 is reset under the elastic force of the reset spring 21, and the contact between the ejector pin 19 and the fixed electrode 18 is disconnected.

[0032] The beneficial effects of the utility model

[0033] The utility model provides a height limit switch, the switch rotating shaft 16 rotates and pushes the ejector pin 19 to advance, the ejector pin 19 contacts the fixed electrode 18, and the first signal output and the second signal output are conducted;The ejector pin 19 is reset under the elastic force of the reset spring 21, the ejector pin 19 is disconnected with the fixed electrode 18, the first signal output and the second signal output are in the disconnected state, and the switching function of the height limit switch is realized. The first shell 11 and the second shell 12 are waterproofed by the sealing grooves and the sealant, and the waterproof performance is improved. The utility model discloses a height limit switch, which is small in space and stable in function.

[0034] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0035] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0036] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The above is the further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled in the art to which the utility model belongs, on the premise of not departing from the concept of the utility model, a number of simple deductions or substitutions can be made.

Claims

1. A height limit switch characterized by, The utility model relates to a switch, including: The shell with the inner chamber, the side wall of shell is equipped with first through -hole with the inner chamber intercommunication; The one end of inner chamber is provided with adapter plate, and the adapter plate is provided with first adapter plate mouth and second adapter plate mouth that do not mutually conduct, and first adapter plate mouth connects first signal output and fixed electrode, and second adapter plate mouth connects second signal output and stylus; The first through -hole is provided with the core wire that second output signal intercommunication is arranged in; The other end of inner chamber is provided with switch rotary shaft, and one end of stylus is in abutment with switch rotary shaft, and switch rotary shaft rotates, pushes the stylus and fixed electrode contact, and first signal output and second signal output are conducted; The stylus is provided with stylus tab on one end close to the adapter plate, and one end of reset spring is in abutment with stylus tab, and the other end is in abutment with stylus side wall, and under the action of reset spring, realize the disconnection of stylus and fixed electrode, and first signal output and second signal output are disconnected.

2. A height limit switch according to claim 1, wherein The side wall of switch rotary shaft is provided with recess, and one end of stylus is arranged in the recess.

3. The height limit switch of claim 1, wherein The adapter plate is provided with guide hole, and the one end of fixed electrode is inserted into guide hole, and the other end of stylus is inserted into guide hole.

4. The height limit switch of claim 1, wherein The shell includes the first shell and the second shell connected with each other, and the first shell and the second shell are connected by screws.

5. A height limiting switch according to claim 4, wherein The opposite sides of the first shell and the second shell are provided with sealing grooves, and the sealing grooves are filled with sealing glue for waterproofing.

6. A height limit switch according to claim 4, wherein The fixed electrode is arranged in the first shell.

7. The height limit switch of claim 1, wherein The end of the stylus away from the stylus tab is provided with a step for limiting the reset spring.

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