阅读说明：本技术 一种安全控制性能稳定的急停按钮 (Emergency stop button with stable safety control performance ) 是由 王浩 于 2020-04-08 设计创作，主要内容包括：本发明涉及智能设备零件技术领域,且公开了一种安全控制性能稳定的急停按钮,包括壳体、常闭触点、常开触点、动触点、常闭弹簧、阀杆、蘑菇头和复位弹簧,所述常闭触点与常开触点在水平面方向呈十字交叉布置,在所述壳体的顶端颈部内壁开设有下旋槽,在所述阀杆的外壁上部设有与下旋槽相适配的下旋条,所述下旋槽和下旋条向下水平投影为同心圆,所述动触点与常开触点接触的行程为下旋槽与下旋条螺纹节距的四分之一。本发明通过在壳体的顶端颈部设下旋槽,并配合阀杆上的下旋条,在阀杆受压下移时以旋转下行的方式进行,从而,使得动触点与常闭触点的初始分离以旋转剪切力进行,从而能够更加省力有效的分离,以保障其安全性能的稳定。(The invention relates to the technical field of intelligent equipment parts, and discloses an emergency stop button with stable safety control performance, which comprises a shell, a normally closed contact, a normally open contact, a movable contact, a normally closed spring, a valve rod, a mushroom head and a return spring, wherein the normally closed contact and the normally open contact are arranged in a cross manner in the horizontal plane direction, a lower spiral groove is formed in the inner wall of the neck at the top end of the shell, a lower spiral strip matched with the lower spiral groove is arranged on the upper portion of the outer wall of the valve rod, the lower spiral groove and the lower spiral strip are projected downwards horizontally into concentric circles, and the contact stroke of the movable contact and the normally open contact is one fourth of the pitch of the threads of the lower spiral groove and the lower spiral strip. According to the invention, the lower spiral groove is arranged at the neck part at the top end of the shell and is matched with the lower spiral strip on the valve rod, and the valve rod moves downwards in a rotating mode when being pressed, so that the initial separation of the movable contact and the normally closed contact is carried out by rotating shearing force, and therefore, the movable contact and the normally closed contact can be separated more effectively in a labor-saving manner, and the stability of the safety performance of the movable contact and the normally closed contact is ensured.)

1. The utility model provides a safety control stable performance's scram button, includes casing (1), normally closed contact (2), normally open contact (3), movable contact (4), normally closed spring (5), valve rod (6), mushroom head (7), reset spring (8) and spacing guard shield (9), its characterized in that: the normally closed contacts (2) and the normally open contacts (3) are arranged in a cross manner in the horizontal plane direction, a lower spiral groove (10) is formed in the inner wall of the neck at the top end of the shell (1), a lower spiral strip (11) matched with the lower spiral groove (10) is arranged on the upper portion of the outer wall of the valve rod (6), downward horizontal projections of the lower spiral groove (10) and the lower spiral strip (11) are concentric circles, and the contact stroke of the movable contact (4) and the normally open contacts (3) is one fourth of the thread pitch of the lower spiral groove (10) and the lower spiral strip (11).

2. The scram button with stable safety control performance according to claim 1, wherein: flannelette is arranged on the surfaces of the lower rotary groove (10) and the lower rotary strip (11), and the directions of villi of the flannelette surfaces are oblique and opposite.

3. The scram button with stable safety control performance according to claim 1, wherein: the top of valve rod (6) is established to the dome face, valve rod (6) and mushroom head (7) contact, the both ends of reset spring (8) respectively with the bottom of mushroom head (7) and the top contact of casing (1) and unfixed.

4. The scram button with stable safety control performance according to claim 1, wherein: the upper end of the outer wall of the valve rod (6) is fixedly sleeved with a dust cover (12), the dust cover (12) is movably sleeved on the neck at the top end of the shell (1) downwards, and the initial distance between the dust cover (12) and the top end of the shell (1) is the contact stroke of the movable contact (4) and the normally open contact (3).

Technical Field

The invention relates to the technical field of intelligent equipment parts, in particular to an emergency stop button with stable safety control performance.

Background

The emergency stop button may also be referred to as an "emergency stop button". The emergency stop button is a measure for protecting people by quickly pressing the emergency stop button in emergency, and generally comprises an operation part (mushroom head), a shell connecting part (plastic shell) and a control part (mounting seat). The principle of the device is shown in figure 1, and the device comprises a shell 1, a normally closed contact 2, a normally open contact 3, a movable contact 4, a normally closed spring 5, a valve rod 6, a mushroom head 7, a return spring 8 and a limiting shield 9, wherein two contacts on the normally closed contact 2 are connected into an equipment bus circuit in series, two contacts on the normally open contact 3 are connected into a safety controller part in series, when the equipment normally works, the upper contact of the movable contact 4 and the normally closed contact 2 are in a normally closed state, when the equipment is in emergency stop, the mushroom head 7 is pressed downwards, the movable contact 4 is separated from the normally closed contact 2 immediately, and then the movable contact 3 is in contact with the normally open contact to start safety.

In the practical use of the equipment, because the frequency of the emergency stop is not high, even the emergency stop button does not need to be started within a certain time, therefore, when the movable contact 4 and the normally closed contact 2 are in the normally closed state, the contact points of the movable contact 4 and the normally closed contact 2 are easily rusted, corroded and bonded due to the high temperature of the high-voltage electric contact, the environment is moist and the like, the separation is difficult, the normal work of an emergency stop button is not facilitated, and usually, the mushroom head 7 can be locked only after being pressed in place, however, in an emergency, the user may not press the mushroom head 7 in place, and the moving contact 4 and the normally closed contact 2 may be closed again due to the elastic restoring forces of the normally closed spring 5 and the return spring 8 after releasing the hand, which is not favorable for implementing an emergency stop operation, and the safety performance in the emergency is unstable.

Disclosure of Invention

Aiming at the defects of the conventional emergency stop button in the use process in the background technology, the invention provides the emergency stop button with stable safety control performance, which has the advantages of easy separation of a normally closed contact and low possibility of self resetting and solves the problems in the background technology.

The invention provides the following technical scheme: an emergency stop button with stable safety control performance comprises a shell, a normally closed contact, a normally open contact, a movable contact, a normally closed spring, a valve rod, a mushroom head, a reset spring and a limiting protective cover, wherein the normally closed contact and the normally open contact are arranged in a cross mode in the horizontal plane direction, a lower spiral groove is formed in the inner wall of the neck portion at the top end of the shell, a lower spiral strip matched with the lower spiral groove is arranged on the upper portion of the outer wall of the valve rod, downward horizontal projections of the lower spiral groove and the lower spiral strip are concentric circles, and the contact stroke of the movable contact and the normally open contact is one fourth of the thread pitch of the lower spiral groove and the lower spiral strip.

Preferably, flannelette is arranged on the surfaces of the lower rotary groove and the lower rotary strip, and the directions of villi of the flannelette surface are oblique and opposite.

Preferably, the top of valve rod is established to the dome face, valve rod and mushroom head contact, reset spring's both ends respectively with the bottom of mushroom head and the top contact of casing and unfixed.

Preferably, the upper end of the outer wall of the valve rod is fixedly sleeved with a dust cover, the dust cover is movably sleeved on the neck at the top end of the shell in a downward direction, and the initial distance between the dust cover and the top end of the shell is the contact stroke of the movable contact and the normally open contact.

The invention has the following beneficial effects:

1. according to the invention, the lower spiral groove is arranged at the neck part at the top end of the shell and is matched with the lower spiral strip on the valve rod, and the valve rod moves downwards in a rotating mode when being pressed, so that the initial separation of the movable contact and the normally closed contact is carried out by rotating shearing force, and therefore, the movable contact and the normally closed contact can be separated more effectively in a labor-saving manner, and the stability of the safety performance of the movable contact and the normally closed contact is ensured.

2. According to the invention, the flannelette is arranged on the surfaces of the lower rotary groove and the lower rotary strip, and the fluff directions on the surfaces of the two flannelette are opposite in an oblique direction, so that the lower rotary strip has small resistance when rotating to move downwards and has large resistance when rotating to move upwards, and the situation that the mushroom head is rebounded when not pressed down is prevented, thereby avoiding the separated movable contact and the normally closed contact from being closed again. Meanwhile, the lower spiral groove is in contact with the surface lint of the lower spiral strip, so that the contact sealing performance of the valve rod and the shell can be improved, and the anti-corrosion performance of the normally closed contact, the normally open contact and the movable contact in the shell is improved.

3. According to the invention, the top end of the valve rod is in contact connection with the mushroom head, and the top end of the valve rod is provided with the dome end, so that on one hand, the valve rod can be driven to move downwards in a labor-saving manner when the mushroom head is pressed by a hand, and on the other hand, the contact area of the valve rod and the mushroom head is reduced, the rotation resistance of the valve rod relative to the mushroom head can be effectively reduced, and the valve rod can rotate downwards conveniently. Meanwhile, due to the separated design of the valve rod and the mushroom head, in the descending process of the valve rod, if the mushroom head is not loosened in place, the mushroom head cannot act on the valve rod again due to the restoring elasticity of the return spring, and therefore the possibility that the valve rod is rebounded is further avoided. And after the mushroom head is pressed in place, the valve rod cannot be lifted up under the condition that the return spring is not unscrewed, so that the stable separation performance of the movable contact and the normally closed contact is further improved.

4. According to the invention, the permanent magnets with magnetic attraction are arranged near the contact of the normally open contact and near the lower contact of the movable contact, so that when the movable contact is contacted with the normally open contact, the magnetic attraction of the permanent magnets balances the elastic force of the normally closed spring, and the movable contact is kept stable when being contacted with the normally open contact by combining the friction resistance of the lower spiral groove and the lower spiral strip. And the normally closed contact and the normally open contact are designed in a cross shape in the horizontal direction, so that on one hand, the requirement of a contact point of the moving contact and the normally open contact after the valve rod rotates to descend is met, and on the other hand, when the moving contact is in contact with the normally closed contact, the magnetic force interference performance is weak due to the staggered arrangement of the normally open contact and the moving contact.

Drawings

FIG. 1 is a schematic diagram of the internal structure of a conventional emergency stop button;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic diagram of the distribution of normally closed contacts and normally open contacts on a horizontal plane according to the present invention;

FIG. 4 is a schematic view showing the arrangement state of the lint on the surface of the lower spiral groove and the lower spiral strip.

In the figure: 1. a housing; 2. a normally closed contact; 3. a normally open contact; 4. a movable contact; 5. a normally closed spring; 6. a valve stem; 7. mushroom heads; 8. a return spring; 9. a limiting shield; 10. a lower rotary groove; 11. downward spinning strips; 12. a dust cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, an emergency stop button with stable safety control performance comprises a housing 1, wherein a normally closed contact 2 and a normally open contact 3 are respectively fixedly installed at the upper end and the lower end of an inner cavity of the housing 1, the normally closed contact 2 and the normally open contact 3 are respectively two parallel points, the normally closed contact 2 is a group, the normally closed contact 3 is a group, the normally open contact 3 is a group, in the prior art, the normally closed contact 2 and the normally open contact 3 are in the same vertical plane, in the present application, the vertical plane where the normally closed contact 2 is located is perpendicular to the vertical plane where the normally open contact 3 is located, in a top plan view, the normally closed contact 2 and the normally open contact 3 are in a cross state, a movable contact 4 is arranged in the inner cavity of the housing 1 and located between the normally closed contact 2 and the normally open contact 3, the movable contact 4 is used for electrically connecting the normally closed contact 2 or the normally open contact 3, the top end of a normally closed spring 5 is contacted with a movable contact 4, the bottom end of the normally closed spring 5 is fixedly connected with the bottom end of an inner cavity of a shell 1, a valve rod 6 is fixedly connected with the middle part of the top end of the movable contact 4, the top end of the valve rod 6 extends out of the inner cavity of the shell 1, a mushroom head 7 is arranged right above the top end of the valve rod 6, the valve rod 6 is contacted with the mushroom head 7, a return spring 8 is arranged at the bottom end of the mushroom head 7, the bottom end of the return spring 8 is positioned on the top end face of the shell 1, two ends of the return spring 8 are respectively contacted and unfixed with the bottom end of the mushroom head 7 and the top end of the shell 1, the arrangement of the return spring 8 can prevent the occurrence of sudden stop triggering caused by small force accidental contact at ordinary times, a limiting shield 9 is movably sleeved on the periphery of the mushroom head 7, the limiting shield 9 is used for limiting the ascending, a lower spiral groove 10 is formed in the inner wall of the neck at the top end of the shell 1, a lower spiral strip 11 matched with the lower spiral groove 10 is arranged on the upper portion of the outer wall of the valve rod 6, downward horizontal projections of the lower spiral groove 10 and the lower spiral strip 11 are concentric circles, and the contact stroke of the movable contact 4 and the normally open contact 3 is one fourth of the pitch of the threads of the lower spiral groove 10 and the lower spiral strip 11.

Specifically, as shown in fig. 4, when the downward rotation strip 11 rotates along the downward rotation direction of the downward rotation groove 10, the fluff tends to be in a separation state, and when the downward rotation strip 11 rotates along the upward rotation direction of the downward rotation groove 10, the fluff tends to be in a tight state, so that the downward rotation resistance of the downward rotation groove 10 and the downward rotation strip 11 can be reduced, and the upward rotation resistance can be improved.

Wherein, the fixed cover in the outer wall upper end of valve rod 6 has connect dust cover 12, dust cover 12 is cup jointed in the top neck of casing 1 to the downward activity, dust cover 12 is the stroke that movable contact 4 and normally open contact 3 contacted with the top initial distance of casing 1, therefore, dust cover 12 is used for spacing valve rod 6's down distance on the one hand, reach the stable contact of contact in order, on the other hand, dust cover 12 is used for preventing dust, form the airtight space of block through dust cover 12 and the screw thread seat of spacing guard shield 9 and the top neck of casing 1, prevent effectively that the dirt grain from getting into in the casing 1, avoid increasing the rotational resistance of valve rod 6.

Wherein, the top end of the valve rod 6 is set as a round top surface. On the one hand, can make the hand more laborsaving drive valve rod 6 down when pressing mushroom head 7, on the other hand reduces valve rod 6 and mushroom head 7's area of contact, can effectively reduce the relative mushroom head 7's of valve rod 6 rotation resistance, and the valve rod 6 of being convenient for rotates down.

The using method of the invention is as follows:

two normally closed contacts 2 are connected in series into a main circuit of equipment to be protected, two normally open contacts 3 are connected in series into an electric appliance safety control circuit, in case of emergency, a worker presses a mushroom head 7 to drive a valve rod 6 to move downwards, the valve rod 6 moves downwards in a downward rotation mode due to the fact that a downward rotation groove 10 is clamped with a downward rotation strip 11 in a spiral mode to drive a movable contact 4 to rotate downwards, the movable contact 4 is separated from the normally closed contacts 2 in a rotary cutting mode, when a dust cover 12 is in contact with the top end of a shell 1, the downward rotation groove 10 and the downward rotation strip 11 rotate by a quarter pitch, the movable contact 4 rotates by 90 degrees at the moment and is in contact with the normally open contacts 3, and the movable contact 4 and the permanent magnets at the normally open contacts 3 are attracted. After the safety accident inspection is finished, the limiting protective cover 9 needs to be unscrewed, the mushroom head 7 needs to be taken down, then the valve rod 6 needs to be lifted upwards, the movable contact 4 is enabled to be in contact with the normally closed contact 2, and then the mushroom head 7 and the limiting protective cover 9 are sequentially installed.

In emergency, when the mushroom head 7 is not pressed in place and hands are released, the mushroom head 7 is rebounded by the return spring 8, the movable contact 4 moves upwards under the action of the elastic force of the normally closed spring 5, at the moment, the friction force between the lower spiral groove 10 and the flannelette surface of the lower spiral strip 11 balances the elastic force and does not move upwards any more, and the movable contact 4 and the normally closed contact 2 are still in a separated state.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.