CN217881261U - Anti-impact device and travel switch - Google Patents

Abstract

The utility model discloses a protecting against shock device, include: the push rod comprises a first cavity with an opening at one end, and a plurality of sliding grooves are formed in the side wall of the first cavity; the ejector rod comprises a limiting part and a second cavity with an opening at one end, a buckle and a dividing groove are arranged on the side wall of the second cavity, the buckle protrudes out of the side wall of the second cavity to be clamped with the sliding groove, the number of the buckle is not more than that of the sliding groove, the dividing groove extends from the opening end of the second cavity to the sealing end, and the limiting part is arranged towards the contact assembly of the travel switch to limit the ejector rod when the ejector rod moves to a preset position; and two ends of the elastic piece are respectively abutted against the sealing end of the first cavity and the sealing end of the second cavity. The utility model discloses a protecting against shock device bears the thrust of action bars and promotes the ejector pin through the push rod, through spacing portion prevention ejector pin continuation motion when the ejector pin moves to predetermineeing the position, uses the continuous thrust that elastic component buffering push rod received simultaneously, has realized the protection to contact subassembly, has prolonged travel switch's life-span.

Description

Anti-impact device and travel switch

Technical Field

The utility model relates to a travel switch technical field, in particular to protecting against shock device and travel switch.

Background

The travel switch is a kind of position switch, and usually uses the collision of the mechanical moving parts to make the contact act to connect or disconnect the control circuit, so as to achieve a certain control purpose.

Because travel switch makes the contact action realize the control of circuit through moving part's collision, can make the contact receive the damage because moving part's multiple collision under the high condition of frequency of use, consequently need design protecting against shock device in travel switch in order to reduce the damage that the collision led to the fact the contact, nevertheless because current protecting against shock device structure is complicated, the assembly is loaded down with trivial details, low in production efficiency, lead to protecting against shock device's manufacturing cost height, and protecting against shock device assembles the process degree of difficulty in travel switch greatly, and then make travel switch be difficult to be equipped with corresponding protecting against shock device, make travel switch's contact easily by the collision inefficacy, travel switch's life reduces.

Therefore, how to prolong the service life of the travel switch is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an anti-shock device to carry out the impact protection to the contact subassembly, promote the life who contains the travel switch who corresponds the contact subassembly.

Another object of the present invention is to provide a travel switch including the above-mentioned impact-proof device.

In order to achieve the above purpose, the utility model provides a following technical scheme:

an impact prevention device for use inside a travel switch, comprising:

the push rod is used for abutting against an operating rod of the travel switch and comprises a first cavity with an opening at one end, and a plurality of sliding grooves are formed in the side wall of the first cavity;

the ejector rod comprises a limiting part and a second cavity with an opening at one end, one end of the second cavity extends into the first cavity, a buckle and a dividing groove are arranged on the side wall of the second cavity, the buckle is used for being clamped with the sliding groove, the number of the buckle corresponds to the number of the sliding groove, at least two dividing grooves are arranged, the dividing groove extends from the opening end of the second cavity to the sealing end so as to divide the second cavity into at least two connected lobes, and the limiting part is arranged towards the contact assembly of the travel switch so as to limit the ejector rod when the ejector rod moves to a preset position;

and one end of the elastic piece is abutted against the sealing end of the first cavity, and the other end of the elastic piece is abutted against the sealing end of the second cavity.

Preferably, in the impact-proof device, the second cavity has a circular truncated cone shape, and an open end of the second cavity is an end with a larger circular truncated cone area.

Preferably, in above-mentioned protecting against shock device, the ejector pin includes the extension portion, extension portion fixed connection in spacing portion, and spacing portion with the hookup location of extension portion, the sectional area of extension portion is less than the sectional area of spacing portion, the direction of extension orientation of extension portion contact subassembly.

Preferably, in the above-mentioned impact-proof device, the protruding portion is in a circular truncated cone shape, and one end of the protruding portion connected to the limiting portion is an end with a large circular truncated cone area.

Preferably, in above-mentioned protecting against shock device, the buckle sets up two, just the buckle is followed the circumference of second cavity evenly sets up, the spout set up twice and with the buckle is the joint cooperation respectively.

Preferably, in the above impact-proof device, the buckle is disposed at an opening end of the second cavity.

Preferably, in the impact-proof device, the dividing grooves are provided in two rows, and the dividing grooves are uniformly provided in the circumferential direction of the second cavity.

Preferably, in the impact prevention device, the dividing groove is U-shaped or V-shaped with an opening facing an opening end of the second cavity.

Preferably, in the above-described impact prevention device, the elastic member is a coil spring.

The utility model provides a travel switch, includes casing, reset spring and set up in contact subassembly and action bars in the casing still include protecting against shock device, protecting against shock device possesses one or more of the technological effect of the protecting against shock device that above-mentioned embodiment provided, protecting against shock device set up in inside the casing, the push rod butt the action bars, the ejector pin spacing portion orientation contact subassembly sets up, the reset spring cover is located protecting against shock device is outside, just reset spring's one end butt the action bars, other end butt stop collar in the casing, the ejector pin is in the motion extremely when predetermineeing the position spacing portion joint stop collar, in order to restrict the ejector pin continues the motion.

Preferably, in the travel switch, an initial force required for the elastic member to elastically deform is larger than an action force of the contact assembly.

Preferably, in the above-described stroke switch, the stiffness coefficient of the elastic member is larger than the stiffness coefficient of the return spring.

According to the technical scheme, the utility model provides an anti-shock device, including elastic component, push rod and ejector pin, wherein, the push rod is used for butt action bars in the travel switch, when external motion part collision action bars, the push rod receives the thrust of action bars and then promotes the ejector pin and produce the motion, the push rod includes first cavity, first cavity is hollow and one end is open, be provided with a plurality of spouts on the lateral wall of first cavity; the ejector rod comprises a limiting part and a second cavity, the second cavity is also a hollow cavity with one open end, the first cavity is sleeved outside the second cavity, the elastic piece is arranged inside the first cavity and the second cavity, one end of the elastic piece is abutted against the sealing end of the first cavity, and the other end of the elastic piece is abutted against the sealing end of the second cavity; be provided with a plurality of buckle on the outside lateral wall of second cavity, the buckle protrusion second cavity's lateral wall surface, the buckle be used for with the first cavity on the spout joint, and the quantity of buckle is not more than the quantity of spout to make every buckle all have the spout that corresponds to carry out the joint.

Meanwhile, at least two dividing grooves are formed in the side wall of the second cavity, the dividing grooves extend from the opening end of the second cavity to the sealing end, the dividing grooves do not reach the sealing end, the second cavity is divided into at least two connected sections, the second cavity arranged in the divided sections can be extruded to deform towards the central axis direction of the second cavity when extending into the first cavity of the push rod, and the second cavity of the push rod can smoothly extend into the first cavity.

The spacing portion of ejector pin sets up towards travel switch's contact subassembly direction, in order to receive the promotion of push rod and the in-process that moves at the ejector pin, when the ejector pin moves to preset position, carry on spacingly to the ejector pin, in order to prevent the ejector pin continuation motion, the continuous motion of avoiding the ejector pin leads to contact subassembly's damage, on this basis, after the ejector pin moves to preset position and contact subassembly and has moved, external moving part fails in time the crash and leads to the action bars to last when exerting thrust to the push rod, the impact that the push rod compression elastic component received in order to cushion the push rod, protect ejector pin and contact subassembly simultaneously.

In the utility model provides an anti-shock device, bear the thrust that the action bars exerted through the push rod, and transmit thrust to the ejector pin through the elastic component, in order to promote the ejector pin motion and contact the contact subassembly through the motion of ejector pin, realize the action of contact subassembly, realize the joint connection through setting up spout on the push rod and buckle that sets up on the ejector pin between push rod and the ejector pin, and the outside of the second cavity of ejector pin is located to the first cavity cover of push rod, the push rod is as the part that directly bears the action bars thrust, great first cavity can evenly transmit thrust to the second cavity on, make the motion route of push rod and ejector pin be the straight line, and simultaneously, set up the cut-off groove on the longer second cavity of length, so that the second cavity can produce the deformation towards second cavity central axis when receiving the extrusion, make the second cavity insert smoothly inside the first cavity and carry out the joint of buckle and spout, and in order to avoid after the action of contact subassembly, external motion part is unable in time to stop motion, be provided with spacing portion on the ejector pin, in order to carry out the spacing to the ejector pin motion to the position of presetting damage of contact subassembly again; on this basis, after the ejector pin moved to predetermineeing the position, external moving part passed through the push rod and applied the thrust of push rod through the action bars and is compressed the elastic component with the push rod butt in order to cushion by the push rod, has further protected ejector pin and contact subassembly for the life-span that contains the travel switch who corresponds the contact subassembly obtains promoting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an exploded view of a shock protection device according to an embodiment of the present invention;

fig. 2 is a schematic forward view of an impact prevention device provided in an embodiment of the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic structural view of a push rod in the impact prevention device provided in the embodiment of the present invention;

fig. 5 is a schematic structural view of a post rod in the impact-proof device provided by the embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a travel switch contact assembly according to an embodiment of the present invention when not in operation;

fig. 7 is a schematic sectional view of a travel switch when the ejector rod moves to a predetermined position according to an embodiment of the present invention;

wherein, 10 is a push rod, 110 is a first cavity, 1120 is a sliding chute, 20 is a push rod, 210 is a second cavity, 2110 is a buckle, 2120 is a dividing groove, 220 is a limiting part, 230 is an extending part, and 30 is an elastic part;

400 is the casing, 500 is reset spring, 600 is the contact subassembly, 700 is the action bars, 800 is the stop collar, 900 is protecting against shock device.

Detailed Description

The core of the utility model lies in disclosing an anti-shock device to the contact subassembly impact protection, promote the life who contains the travel switch who corresponds the contact subassembly.

Another object of the present invention is to provide a travel switch including the above-mentioned impact-proof device.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below are not intended to limit the scope of the present invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

As shown in fig. 1-5, the utility model provides an impact protection device, including elastic component 30, push rod 10 and ejector pin 20, wherein, push rod 10 is used for butt action bars 700 in the travel switch, and when external motion part collided action bars 700, push rod 10 received the thrust of action bars 700 and then promoted ejector pin 20 and produced the motion, it should explain that, action bars 700 are travel switch's common part, and its effect is that the first end of action bars 700 is used for bearing the collision of external motion part to pass power to the part with action bars 700 second end contact, in this embodiment, action bars 700 when receiving the collision of external part, can promote push rod 10 and make push rod 10 move.

The push rod 10 includes a first cavity 110, the first cavity 110 is hollow and has an open end, and a plurality of sliding grooves 1120 are disposed on the side wall of the first cavity 110 to meet the requirements of clamping and guiding.

The push rod 20 comprises a limiting part 220 and a second cavity 210 which are integrated, the second cavity 210 is also a hollow cavity with one open end, the first cavity 110 is sleeved outside the second cavity 210, the elastic element 30 is arranged inside the first cavity 110 and the second cavity 210, one end of the elastic element 30 is abutted against the sealing end of the first cavity 110, and the other end of the elastic element is abutted against the sealing end of the second cavity 210, so that the push rod 10 is smoothly transmitted to the push rod 20 by the thrust applied by the operating rod 700, and the push rod 20 moves; a plurality of buckles 2110 are arranged on the outer side wall of the second cavity 210, the buckles 2110 protrude out of the side wall surface of the second cavity 210, the buckles 2110 are used for buckling with the sliding chutes 1120 on the first cavity 110, and the number of the buckles 2110 corresponds to the number of the sliding chutes 1120, where the number corresponds to that each buckle 2110 has a sliding chute 1120 capable of being embedded and installed.

Meanwhile, at least two dividing grooves 2120 are formed in the side wall of the second cavity 210, the dividing grooves 2120 extend from the open end of the second cavity 210 to the closed end, and the dividing grooves 2120 do not reach the closed end of the second cavity 210, so that the second cavity 210 is divided into at least two connected parts, and when the second cavity 210 which is divided into parts extends into the first cavity 110, the second cavity 210 can be extruded to deform towards the central axis direction of the second cavity 210, so that the second cavity 210 can smoothly extend into the first cavity 110; and because the utility model provides an among the protecting against shock device, the length of second cavity 210 is greater than the length of first cavity 110, consequently will cut apart groove 2120 and set up the length of seting up that can increase cut apart groove 2120 on second cavity 210, longer cut apart groove 2120 makes second cavity 210 produce the required power of deformation littleer, further makes the process that second cavity 210 inserted first cavity 110 more smooth.

It should be noted that, the first cavity 110 and the second cavity 210 of the sleeving structure enable the elastic element 30 to be completely surrounded by the cavity, so that the risk that the elastic element 30 is corroded from the outside is reduced, meanwhile, the connecting structure of the first cavity 110 and the second cavity 210 of the sleeving structure is stable, the first cavity 110 directly bears the force applied by the operating rod 700, the first cavity 110 with a large cross-sectional area can uniformly transmit the thrust applied by the operating rod 700 to the second cavity 210 of the push rod 20, and the push rod 20 and the push rod 10 are enabled to be uniformly stressed and move along a preset linear path.

The limiting part 220 arranged on the push rod 20 is connected to the sealed end of the second cavity 210, the limiting part 220 of the push rod 20 is arranged towards the direction of the contact assembly 600 of the travel switch, the contact assembly 600 is a contact switch assembly inside the travel switch, when the contact assembly 600 is contacted by an external component, the contact assembly 600 acts to generate an electric signal to switch the on/off working state of the travel switch, the limiting part 220 is arranged towards the direction of the contact assembly 600 of the travel switch to limit the push rod 20 when the push rod 20 moves to a preset position in the process of being pushed by the push rod 10 to move, so as to prevent the push rod 20 from continuously moving and avoid the damage of the contact assembly 600 caused by the continuous movement of the push rod 20, on the basis, when the push rod 20 moves to the preset position and the contact assembly 600 has acted, the external moving component cannot timely stop collision to cause the operating rod 700 to continuously apply thrust to the push rod 10, the push rod 10 compresses the elastic member 30 to buffer the collision force of the push rod 10, and simultaneously protect the push rod 20 and the contact assembly 600.

In the utility model provides an impact protection device, bear the thrust that operating rod 700 applyed through push rod 10, and transmit thrust to ejector pin 20 through elastic component 30, in order to promote ejector pin 20 to move and contact assembly 600 through the motion of ejector pin 20, realize the action of contact assembly 600, realize the joint through setting up in push rod 10 upper chute 1120 and buckle 2110 that sets up on ejector pin 20 between push rod 10 and the ejector pin 20 and be connected, and the outside of the second cavity 210 of ejector pin 20 is located to the first cavity 110 cover of push rod 10, push rod 10 is the part that directly bears operating rod 700 thrust, bigger first cavity 110 can evenly transmit thrust to second cavity 210, make push rod 10 and the motion route of ejector pin 20 be the straight line, simultaneously, set up cutting apart groove 2120 on the second cavity 210 of ejector pin 20 so that second cavity 210 can insert first cavity 110 smoothly and carry out the joint of buckle 2110 and chute 1120, and in order to avoid after contact assembly 600 moves, external motion part can not stop motion in time, be provided with spacing portion 220 on ejector pin 20, in order to carry out the joint of buckle 2110 and the preset contact assembly motion when moving to the position, make ejector pin 20 damage, it arrive at the preset contact assembly motion position, and prevent contact assembly 600 from damaging again; on this basis, after the ejector rod 20 moves to the preset position, the external moving part compresses the elastic member 30 abutted with the push rod 10 by the push rod 10 through the thrust applied to the push rod 10 by the operating rod 700 so as to buffer, so that the ejector rod 20 and the contact assembly 600 are further protected, and the service life of the travel switch comprising the corresponding contact assembly 600 is prolonged.

Further, in order to optimize the effect of the impact protection device provided by the present invention, in a specific embodiment of the present invention, the second cavity 210 is of a circular truncated cone configuration, the open end of the second cavity 210 is the end with the larger circular truncated cone area, the sealing end of the second cavity 210 is the end with the smaller circular truncated cone area, after the push rod 10 receives the thrust action of the operation rod 700, the elastic member 30 is compressed by the sealing end of the first cavity 110, the elastic member 30 generates elastic deformation towards the sealing end of the second cavity 210, in the deformation process of the elastic member 30, the area close to the sealing end of the second cavity 210 is close to the inner wall contact of the elastic member 30 and the second cavity 210; compared with the second cavity 210 with a cylindrical configuration, when the push rod 10 continuously receives the thrust after the push rod 20 moves to the preset position, the process that the push rod 10 compresses the elastic member 30 is a process that the difficulty gradually increases, at the opening end of the second cavity 210, the thrust applied by the operating rod 700 to the push rod 10 completely acts on the elastic member 30 to compress the elastic member 30, along with the compression of the elastic member 30, the sectional area of the inner wall of the second cavity 210 with the circular truncated cone configuration gradually decreases, the elastic member 30 contacts the inner wall of the second cavity 210, at this time, the thrust received by the push rod 10 needs to overcome the friction force generated by the elastic member 30 and the inner wall of the second cavity 210, and then the elastic member 30 is compressed again, and the larger the compression amount of the elastic member 30 by the push rod 10 is, the larger the contact area of the elastic member 30 and the inner wall of the second cavity 210 is, and the larger the friction force that the push rod 10 needs to overcome is; through the configuration design with second cavity 210 for the round platform to make push rod 10 in the inside degree of difficulty increase gradually of compression elastic component 30 of second cavity 210, make the utility model provides an impact device's buffering and protection effect are more excellent.

Further, in an embodiment of the present invention, the push rod 20 is provided with a protruding portion 230, the protruding portion 230 is fixedly connected to the position-limiting portion 220, and the protruding direction of the protruding portion 230 faces the contact assembly 600 of the travel switch, during the movement of the push rod 20, the push rod 20 contacts the contact assembly 600 through the protruding portion 230 to make the contact assembly 600 move; meanwhile, the limiting portion 220 is a part for limiting the movement of the push rod 20, which is very important for protecting the push rod 20 and the contact assembly 600, in this embodiment, at the connecting position of the protruding portion 230 and the limiting portion 220, the sectional area of the protruding portion 230 is smaller than that of the limiting portion 220, so as to realize the movement limitation of the push rod 20 through the area difference between the protruding portion 230 and the limiting portion 220; during the movement of the plunger 20 toward the contact assembly 600, the protrusion 230 contacts the contact assembly 600 to make the contact assembly 600 act, and when the plunger 20 moves to the preset position, the limit portion 220 is blocked by the limit structure in the travel switch, so that the movement of the plunger 20 toward the contact assembly 600 is stopped while the protrusion 230 can contact the contact assembly 600.

It should be noted that the connection mode of the extension portion 230 and the limiting portion 220 may be a threaded connection, a welding or an integrated molding, in a preferred embodiment of the present invention, the extension portion 230 is connected with the limiting portion 220 by an integrated molding.

In another embodiment of the present invention, the protruding portion 230 is a circular truncated cone configuration, and the one end that the protruding portion 230 connects the limiting portion 220 is the great one end of circular truncated cone area, the contact assembly 600 moves after the protruding portion 230 contacts the contact assembly 600, but the external moving part continues to exert the in-process of thrust to the push rod 10, the protruding portion 230 continues to move towards the contact assembly 600, at this time, because the configuration of the protruding portion 230 is a circular truncated cone, make the interior limit structure of travel switch gradually with the outer surface contact of the protruding portion 230, and the frictional force between the interior limit structure of travel switch and the protruding portion 230 can be along with the increase of the circular truncated cone cross-section of the protruding portion 230 and grow, before the push rod 20 moves to the preset position, alleviate some buffer force through the protruding portion 230, further protect the contact assembly 600.

In order to ensure the connection effect of the clamping connection between the push rod 10 and the push rod 20, the number of the buckles 2110 arranged on the side wall of the second cavity 210 may be one or more, and meanwhile, the number of the buckles 2110 may be increased according to the magnitude of the elastic force when the elastic member 30 is reset, so as to prevent the buckles 2110 from being damaged due to the excessive reset elastic force, in a preferred embodiment of the present invention, two buckles 2110 are arranged, similarly, two corresponding sliding grooves 1120 are arranged on the side wall of the first cavity 110 of the push rod 10, and the two buckles 2110 are symmetrically arranged about the central axis of the second cavity 210, so that the stress on the second cavity 210 is uniform when the first cavity 110 compresses the elastic member 30 and the elastic member 30 is reset, and meanwhile, in the installation process of sleeving the first cavity 110 of the push rod 10 on the outer side of the second cavity 210 of the push rod 20, the number of the buckles 2110 is more, the clamping difficulty is higher, so that the two buckles 2110 ensure that the clamping difficulty of the first cavity 110 and the second cavity 210 is uniform is reduced when the push rod 10 is stressed.

It should be noted that, the number of the chutes 1120 may be equal to the number of the buckles 2110, or may be greater than the number of the buckles 2110, so that a single buckle 2110 can correspond to multiple mounting positions, which is convenient for the buckle 2110 to be mounted in a clamping manner, but the overall rigidity and strength of the push rod 10 are affected by the excessive number of the chutes 1120, and therefore, it is preferable that the number of the chutes 1120 is equal to the number of the buckles 2110.

In order to further optimize the above technical solution, in an embodiment of the present invention, the buckle 2110 is disposed at the open end of the second cavity 210, so that in the installation process of sleeving the first cavity 110 on the outer side of the second cavity 210, the buckle 2110 contacts the open end of the first cavity 110 first, which is convenient for pre-aligning the buckle 2110 and the sliding groove 1120, and the process of clamping the sliding groove 1120 by the buckle 2110 is smoother.

Further, at least two dividing grooves 2120 may be arbitrarily arranged in the circumferential direction of the second cavity 210, or may be uniformly arranged in the circumferential direction of the first cavity 110, and it is only ensured that the dividing grooves 2120 divide the second cavity 210 into at least two lobes, so that the second cavity 210 can deform, since the number of the dividing grooves 2120 is too large, the rigidity and strength of the second cavity 210 are affected, and the service life of the second cavity 210 is affected, therefore, it is preferable that the dividing grooves 2120 are arranged twice and uniformly arranged in the circumferential direction of the second cavity 210, so as to divide the second cavity 210 into two lobes with the same area, so that the two lobes of the second cavity 210 deform uniformly when deforming, and damage to a portion with a larger deformation amount due to different lobes of the second cavity 210 is avoided, and the ejector rod 20 fails.

In order to further optimize above-mentioned technical scheme, the utility model provides an among the protecting against shock device, cut apart groove 2120 and be the U type or the V type of opening towards the open end of second cavity 210, the cut apart groove 2120 of U type or V type is convenient for process to improve ejector pin 20's production efficiency.

Further, in the utility model provides an anti-shock device, elastic component 30 can be coil spring, also can be gas spring, and it is here preferred that elastic component 30 is coil spring.

As shown in fig. 6 and 7, the utility model also provides a travel switch, travel switch includes casing 400, reset spring 500 and set up in inside contact element 600 and the action bars 700 of casing 400, still including the protecting against shock device 900 that possesses the technical effect of any preceding embodiment, protecting against shock device 900 sets up inside casing 400, protecting against shock device 900's push rod 10 butt travel switch's action bars 700, when action bars 700 end receives the collision of external motion structure, can exert thrust to push rod 10, and then promote ejector pin 20 through push rod 10 and move, protecting against shock device 900's ejector pin 20 sets up towards contact element 600, contact element 600 and make contact element 600 move in the motion process at ejector pin 20, when ejector pin 20 moves to preset position, spacing portion 220 joint travel switch's stop collar 800, continue to move with restriction ejector pin 20.

The return spring 500 is sleeved outside the impact prevention device 900, one end of the return spring 500 abuts against the operation rod 700, and the other end of the return spring abuts against the limiting sleeve 800 in the housing 400, so that the thrust generated by the collision of the operation rod 700 is buffered.

In the operation process of the travel switch, when the end of the operating rod 700 is collided by an external motion structure, the operating rod 700 is used for pushing the push rod 10 of the impact protection device 900, and then the push rod 20 is pushed by the push rod 10, so that the contact assembly 600 is contacted by the motion of the push rod 20, and the contact assembly 600 acts to control the external motion structure to stop moving, when the external motion structure cannot smoothly stop and continuously collide with the operating rod 700, the push rod 20 is used for pushing the contact assembly 600 to continuously move to the preset position of the push rod 20, at this time, the limit part 220 of the impact protection device 900 is in clamping connection with the limit sleeve 800 of the travel switch, so that the push rod 20 stops moving and cannot continuously push the contact assembly 600, and the contact assembly 600 is protected, meanwhile, one part of the impact force applied to the operating rod 700 is compressed by the reset spring 500 abutted to the operating rod 700, the other part of the impact force is transmitted to the push rod 10 and is compressed by the elastic piece 30 through the push rod 10 to buffer the impact force, so that the contact assembly 600 is protected in cooperation, and the service life of the travel switch is prolonged.

In order to further optimize above-mentioned technical scheme, the utility model provides an among travel switch and protecting against shock device 900, the required initial force of elastic deformation production elastic component 30 is greater than contact assembly 600's action power, so that when push rod 10 promoted the extension 230 contact assembly 600 of ejector pin 20, extension 230 makes contact assembly 600 move the back earlier, rethread push rod 10 compression elastic component 30 is with the buffering impact, avoid because the initial force undersize of elastic component 30, and lead to push rod 10 to compress elastic component 30 earlier and then drive contact assembly 600 action, make elastic component 30 lose the function of buffering impact.

Based on the above embodiment, the stiffness coefficient of the elastic member 30 is greater than that of the return spring 500, so that when the operating rod 700 is impacted by an external moving structure, the return spring 500 is compressed first, and then the elastic member 30 is compressed, so as to protect the contact assembly 600 of the travel switch and ensure the integrity and safety of the impact-resistant structure.

The terms "first" and "second" and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular sequence, and furthermore the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include other steps or elements not listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. An anti-shock device used inside a travel switch, comprising:

the push rod (10) is used for abutting against an operating rod of the travel switch, the push rod (10) comprises a first cavity (110) with one open end, and a plurality of sliding grooves (1120) are formed in the side wall of the first cavity (110);

the ejector rod (20), the ejector rod (20) comprises a limiting part (220) and a second cavity (210) with one open end, one end of the second cavity (210) extends into the first cavity (110), the side wall of the second cavity (210) is provided with buckles (2110) and dividing grooves (2120), the buckles (2110) are used for being buckled with the sliding grooves (1120), the number of the buckles (2110) corresponds to the number of the sliding grooves (1120), the dividing grooves (2120) are at least provided twice, the dividing grooves (2120) extend from the open end of the second cavity (210) to the closed end to divide the second cavity (210) into at least two connected pieces, and the limiting part (220) is arranged towards the contact assembly of the travel switch to limit the ejector rod (20) when the ejector rod (20) moves to the preset position;

one end of the elastic piece (30) is connected with the sealing end of the first cavity (110) in an abutting mode, and the other end of the elastic piece (30) is connected with the sealing end of the second cavity (210) in an abutting mode.

2. An impact protection device as claimed in claim 1, wherein said second cavity (210) is of frustoconical configuration and the open end of said second cavity (210) is the end of larger frustoconical area.

3. An impact protection device according to claim 1, wherein the carrier rod (20) comprises a protruding portion (230), the protruding portion (230) is fixedly connected to the position-limiting portion (220), and at a connecting position of the position-limiting portion (220) and the protruding portion (230), a sectional area of the protruding portion (230) is smaller than a sectional area of the position-limiting portion (220), and a protruding direction of the protruding portion (230) faces the contact assembly (600).

4. An impact protection device according to claim 3, wherein the protrusion (230) has a truncated cone shape and the end of the protrusion (230) connected to the limiting portion (220) has a larger truncated cone area.

5. The impact protection device according to claim 1, wherein there are two said snap hooks (2110), and said snap hooks (2110) are uniformly arranged along the circumference of said second cavity (210), and said slide groove (1120) is provided with two said snap hooks (2110) respectively engaged therewith.

6. An impact protection as claimed in claim 1, characterized in that said catch (2110) is provided at the open end of said second cavity (210).

7. The impact prevention device according to claim 1, wherein the dividing grooves (2120) are provided in two, and the dividing grooves (2120) are uniformly provided in a circumferential direction of the second chamber (210).

8. An impact protection device as claimed in claim 7, wherein said dividing groove (2120) is U-shaped or V-shaped opening towards the open end of said second cavity (210).

9. An impact protection device according to any one of claims 1 to 8, wherein said elastic member (30) is a coil spring.

10. A travel switch, includes casing (400), reset spring (500) and sets up contact subassembly (600) and action bars (700) in casing (400), characterized by, still include according to any one of claims 1-9 protecting against shock device (900), protecting against shock device (900) set up inside casing (400), push rod (10) butt action bars (700), ejector pin (20) spacing portion (220) orientation contact subassembly (600) set up, reset spring (500) cover is located protecting against shock device (900) outside, just the one end butt of reset spring (500) action bars (700), other end butt stop collar (800) in casing (400), ejector pin (20) when moving to preset the position spacing portion (220) joint stop collar (800) with the restriction ejector pin (20) continues the motion.

11. Travel switch according to claim 10, characterized in that the initial force required for the elastic deformation of the elastic element (30) is greater than the actuation force of the contact assembly (600).

12. Travel switch according to claim 10, characterized in that the stiffness coefficient of the elastic element (30) is greater than the stiffness coefficient of the return spring (500).

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