Conveyor protection switch

Abstract

The utility model discloses a conveyor protection switch, which is characterized in that when a trigger rod is driven by a plastic-coated steel wire rope, no matter which side the trigger rod is wrenched, the trigger rod drives a trigger shaft connected with the trigger rod, the trigger shaft simultaneously drives a trigger shaft sleeve on the trigger shaft, the trigger shaft sleeve pushes a poking piece, the poking piece pokes a switch cam, and the cam is provided with a spring piece. When the cam is shifted to rotate until the stress peak of the spring piece exceeds the center of the reset shaft, the cam jumps quickly, the fan-shaped groove on the cam is matched with the boss of the shell to limit the rotation angle, and the cam triggers the microswitch to operate due to the rotation of the cam so as to achieve the purpose of sending out a shutdown signal. Due to the fact that the pin shaft on the shifting piece moves in the two fan-shaped holes of the cam, no matter which direction the trigger rod moves, the cam can be pushed or pulled, the spring piece exceeds the position above the reset shaft, the spring piece jumps rapidly, the safety protection performance of the safety protection device is more reliable due to the unique balance type structural design, and when the plastic-coated steel wire rope falls off or breaks, the safety protection device can be used for protecting the plastic-coated steel wire rope. And the switch is automatically triggered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of protective switch, especially relates to conveyor protective switch. BACKGROUND

[0002] Conveyor protective switch is the indispensable protection device in conveyor system, and can effectively play the device of protecting the safety of operating personnel and equipment in the conveyor system, and the conveyor protective switch meets the special provisions of industrial safety rules, and the installation of the emergency stop device in the belt conveyor system can effectively ensure the safety of operating personnel.

[0003] At present, the trigger rod of the conveyor protective switch is generally driven by the plastic-coated steel wire rope, and the plastic-coated steel wire rope is arranged along the two sides of the conveying system. Since the existing trigger rod of the conveyor protective switch is limited in the driving direction, and when the plastic-coated steel wire rope falls off or breaks, the trigger rod may not be driven, which has a safety hazard. Therefore, we propose the conveyor protective switch. UTILITY MODEL CONTENTS

[0004] In order to overcome the shortcomings of the prior art, the utility model provides the conveyor protective switch, and the unique balanced structure design makes it more reliable in safety protection performance. When the plastic-coated steel wire rope falls off or breaks, the switch will automatically trigger.

[0005] To solve the above technical problems, the utility model provides the following technical scheme:

[0006] The conveyor protective switch comprises an outer shell, a micro switch is arranged at the upper end of the inner part of the outer shell, a reset shaft is rotatably connected to the lower part of the micro switch, and a cam with a convex point in contact with the micro switch is connected to the reset shaft;

[0007] A spring sheet is connected between the cam and the inner bottom of the outer shell;

[0008] One end of the reset shaft extends out of the outer shell and is connected with a reset rod;

[0009] The bottom surface of the cam has a sector-shaped groove coaxial with the reset shaft, the inner bottom of the outer shell has a boss, and the end of the boss is located in the sector-shaped groove of the cam;

[0010] A trigger shaft is rotatably connected to the lower part of the cam, a trigger shaft sleeve is connected to the trigger shaft, and a tab connected with the cam is connected to the trigger shaft sleeve;

[0011] The outer surface of the cam has symmetrical sector-shaped holes coaxial with the reset shaft on both sides, the tab has a "C" shaped profile and both ends face the cam, and the ends of the tab are connected with a pin shaft movably located in the sector-shaped hole of the cam;

[0012] One end of the trigger shaft extends out of the shell and is connected with a trigger lever, and the extension direction of the trigger shaft is opposite to the reset shaft, that is, the trigger lever and the reset lever are respectively located on the front and rear sides of the shell.

[0013] Preferably, the trigger lever and the trigger shaft are detachably connected, and specifically connected by bolts, and the top end of the trigger lever has a sleeve hole for a tether.

[0014] Preferably, the force direction of the spring sheet when not triggered is below the reset shaft, and the force direction of the spring sheet after being triggered is above the reset shaft.

[0015] Preferably, a cover shaft sleeve is connected between the end of the reset shaft away from the reset lever and the shell, a transparent cover shaft sleeve is connected between the end of the reset shaft adjacent to the reset lever and the shell, a lip seal is connected between the front end of the transparent cover shaft sleeve and the reset shaft, and an O-shaped seal is connected between the inside of the transparent cover shaft sleeve and the reset shaft.

[0016] Preferably, a cover shaft sleeve is connected between the end of the trigger shaft away from the trigger lever and the shell, a transparent cover shaft sleeve is connected between the end of the trigger shaft adjacent to the trigger lever and the shell, a lip seal is connected between the front end of the transparent cover shaft sleeve and the trigger shaft, and an O-shaped seal is connected between the inside of the transparent cover shaft sleeve and the trigger shaft.

[0017] A micro switch is arranged on the upper end of the inside of the shell, at least two micro switches are designed, a rotary shaft is arranged below the micro switch and rotationally connected with the shell, a cam corresponding to the micro switch is connected with the rotary shaft, and the convex point of the cam is in contact with the micro switch.

[0018] A torsional spring is connected between the rotary shaft and the shell.

[0019] One end of the rotary shaft extends out of the shell and is connected with a trigger roller set.

[0020] Preferably, a cover shaft sleeve is connected between the end of the rotary shaft away from the trigger roller set and the shell, a transparent cover shaft sleeve is connected between the end of the rotary shaft adjacent to the trigger roller set and the shell, a lip seal is connected between the front end of the transparent cover shaft sleeve and the rotary shaft, and an O-shaped seal is connected between the inside of the transparent cover shaft sleeve and the rotary shaft.

[0021] Preferably, the shell comprises an upper cover and a lower shell, the upper cover is a hollow body with an opening at the bottom, the lower shell is a hollow body with an opening at the top, the upper cover covers the lower shell to form a hollow body with a bottom, and a sealing ring is arranged between the openings of the upper cover and the lower shell.

[0022] Preferably, the lower shell is provided with a wiring hole in communication with the interior at both ends, and a waterproof joint is screwed to the wiring hole; and the top surface of the upper cover is embedded with an indicating lamp connected to the microswitch signal.

[0023] Preferably, the cam and the rotating shaft are detachably connected, and are connected by bolts.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] The unique balanced structure design makes it more reliable in safety protection performance, and when the plastic-coated steel wire rope is off or broken, the switch will be automatically triggered.

[0026] The structure can make the switch action more rapid and reduce the possibility of arc generation.

[0027] The structure needs to be manually reset, which can effectively prevent misoperation and is safer.

[0028] The spring sheet is designed without a ratchet mechanism, and there is no pawl and ratchet wear failure.

[0029] The reset rod and the trigger rod are located on different sides of the switch, and the reset rod can be installed on the outside while the trigger rod is located on the inside during installation, so that the operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a shell schematic diagram of the utility model.

[0031] Figure 2 It is a trigger shaft sleeve schematic diagram of the utility model.

[0032] Figure 3 It is a microswitch schematic diagram of the utility model.

[0033] Figure 4 It is a reset shaft schematic diagram of the utility model.

[0034] Figure 5 It is a trigger shaft schematic diagram of the utility model.

[0035] Figure 6 It is a push piece schematic diagram of the utility model.

[0036] Figure 7 It is a cam schematic diagram of the utility model.

[0037] Figure 8 It is a trigger roller group schematic diagram of the utility model.

[0038] Figure 9 It is a rotating shaft schematic diagram of the utility model.

[0039] Wherein: 1, the upper cover; 2, the lower shell; 3, the wiring hole; 4, the indicator light; 5, the trigger rod; 6, the reset rod; 7, the cam; 8, the dial; 9, the trigger shaft sleeve; 10, the micro switch; 11, the reset shaft; 12, the spring piece; 13, the trigger shaft; 14, the cover shaft sleeve; 15, the transparent cover shaft sleeve; 16, the sealing ring; 17, the O-shaped seal; 18, the lip seal; 19, the pin shaft; 20, the trigger roller group; 21, the rotary shaft; 22, the torsional spring. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. The experimental methods in the following embodiments are all conventional methods, and the materials and reagents used in the following embodiments are all commercially available unless otherwise specified.

[0041] Embodiment 1

[0042] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 And Figure 7 , the utility model provides conveyor protection switch, the inside upper end of shell is provided with micro switch 10, the lower portion of micro switch 10 is provided with reset shaft 11 that is rotatably connected with shell, the convex point that is contacted with micro switch 10 is connected on reset shaft 11, spring piece 12 is connected between the bottom of shell and cam 7, one end of reset shaft 11 extends out of shell and is connected with reset rod 6, the bottom surface of cam 7 has the sector slot that is coaxial with reset shaft 11, the inner bottom of shell has the boss, and the boss end is located inside the sector slot of cam 7, the lower portion of cam 7 is provided with trigger shaft 13 that is rotatably connected with shell, trigger shaft sleeve 9 is connected on trigger shaft 13, dial 8 is connected on trigger shaft sleeve 9 and is connected with cam 7, the both sides of the outer surface of cam 7 have the sector hole that is coaxial with reset shaft 11 and symmetrical, the outline of dial 8 is " C " character shape profile and both ends are oriented to cam 7, the end of dial 8 is connected with pin shaft 19 that is located in the sector hole of cam 7 and moves, one end of trigger shaft 13 extends out of shell and is connected with trigger rod 5, and the extension direction of trigger shaft 13 is opposite to reset shaft 11, namely, trigger rod 5 and reset rod 6 are located at the front and rear sides of shell respectively.

[0043] The trigger lever 5 is driven by a plastic coated steel wire rope which is arranged along the two sides of the conveying system and is provided to the whole length of the conveyor, the plastic coated steel wire rope drives the switch trigger to achieve the function of emergency stop, when it is necessary to restore the conveyor system, the switch can be reset by pressing the reset lever 6, so that the conveying system can be restarted.

[0044] When the trigger lever 5 is pulled in any direction by the driving of the plastic coated steel wire rope, the trigger lever 5 drives the trigger shaft 13 connected thereto, the trigger shaft 13 drives the trigger shaft sleeve 9 on the shaft at the same time, the trigger shaft sleeve 9 drives the pullout piece 8, the pullout piece 8 drives the switch cam 7, the cam 7 has a spring piece 12, when the cam 7 is rotated to the force point of the spring piece 12 beyond the center of the reset shaft 11, the cam 7 will jump quickly, the rotation angle is limited by the cam 7 and the boss of the shell through the matching of the sector groove on the cam 7, due to the rotation of the cam 7, the cam 7 triggers the micro switch 10 to work, so that the stop signal is sent.

[0045] Since the pin shaft 19 on the pullout piece 8 moves in the two sector holes of the cam 7, no matter in which direction the trigger lever 5 moves, the cam 7 can be pushed or pulled, so that the spring piece 12 is beyond the reset shaft, and the reset shaft jumps quickly.

[0046] The unique balanced structure design makes the safety protection performance more reliable, when the plastic coated steel wire rope falls off or breaks, the switch will be automatically triggered.

[0047] The above structure can make the switch action more quickly, and reduce the possibility of arc generation.

[0048] The structure needs to be manually reset, which can effectively prevent misoperation and is safer.

[0049] The spring piece 12 is designed without a ratchet mechanism, and there is no ratchet and pawl wear and action failure.

[0050] The reset lever 6 and the trigger lever 5 are located on different sides of the switch, when installed, the reset lever 6 can be installed on the outside, and the trigger lever 5 is located on the inside, so that the operation is more convenient.

[0051] As shown in Figures 1 to 7 The utility model discloses a detachable connection between the trigger lever 5 and the trigger shaft 13, specifically adopts bolt connection, and the top end of the trigger lever 5 has a sleeve hole for tying a rope.

[0052] As shown in Figures 1 to 7 The utility model discloses that the force direction of the spring piece 12 when not triggered is below the reset shaft 11, and the force direction of the spring piece 12 after triggering is above the reset shaft 11.

[0053] As shown in Figures 1 to 7As shown in the utility model discloses reset shaft 11 is away from the one end of reset rod 6 and is connected with the cover shaft sleeve 14 between the shell, and the one end of reset shaft 11 is adjacent to reset rod 6 and is connected with the cover shaft sleeve 15 between the shell, and the front end of cover shaft sleeve 15 is connected with the lip seal 18 between reset shaft 11, and the inside of cover shaft sleeve 15 is connected with the O type seal 17 between reset shaft 11.

[0054] As Figures 1 to 7 As shown in the utility model discloses trigger shaft 13 is away from the one end of trigger rod 5 and is connected with the cover shaft sleeve 14 between the shell, and the one end of trigger shaft 13 is adjacent to trigger rod 5 and is connected with the cover shaft sleeve 15 between the shell, and the front end of cover shaft sleeve 15 is connected with the lip seal 18 between trigger shaft 13, and the inside of cover shaft sleeve 15 is connected with the O type seal 17 between trigger shaft 13.

[0055] As Figures 1 to 7 As shown in the utility model discloses the shell includes upper cover 1 and lower shell 2, and upper cover 1 is the hollow body with the opening in bottom, and lower shell 2 is the hollow body with the opening in top, and upper cover 1 covers in lower shell 2 combination constitutes the hollow body of top-down seal bottom, and the opening between upper cover 1 and lower shell 2 is provided with sealing ring 16, and the both ends surface of lower shell 2 is provided with the wiring hole 3 that communicates with inside, and the waterproof joint is connected in wiring hole 3, and the top surface of upper cover 1 is embedded with the indicating lamp 4 that is signal connected with microswitch 10.

[0056] Example 2

[0057] Please refer to Figure 8 And Figure 9 As shown in the utility model provides conveyor protection switch, including the shell, and the inside upper end of shell is provided with microswitch 10, and microswitch 10 is designed at least with two, and the lower portion of microswitch 10 is provided with the rotary shaft 21 that is rotatably connected with shell, and the rotary shaft 21 is connected with the cam 7 corresponding with microswitch 10, and the convex point of cam 7 contacts with microswitch 10, and the rotary shaft 21 is connected with torsion spring 22 between shell, and one end of rotary shaft 21 extends out of shell and is connected with trigger roller set 20.

[0058] Install in the head or tail of belt conveyor or easy to run off position, when conveying appears to run off, will trigger switch, and switch can two pole action, and the first stage is to send alarm signal, and the second stage sends stop signal, when run off disappears, can automatically reset.

[0059] When the conveying belt is running off, the conveying belt edge contacts the trigger roller set 20 of the switch, pushes the deflection shaft 21 to deflect, drives the cam 7 on the deflection shaft 21 to deflect, the cam 7 drives the microswitch 10 to operate, two microswitches 10 are used for controlling alarm signals and one is used for controlling stop signals, so that the user can manually intervene when the conveying belt is slightly running off, the conveying belt is prevented from running off excessively, and equipment damage, material falling or unexpected stoppage is avoided.

[0060] The two cams 7 are fastened on the deflection shaft 21 by bolts, different deflection angles of the cam 7 can be set to trigger the microswitch 10 by adjusting the position of the cam 7, so that the device can actually alarm and stop according to the different running off amounts of the user.

[0061] The deflection shaft 21 is provided with a torsion spring 22, which can return to the initial position of the trigger roller set 20 when the conveying belt returns to normal after running off (i.e. the conveying belt returns to the center and the conveying belt edge is separated from the trigger roller), the cross section of the torsion spring 22 can be rectangular or circular, and the direction of the trigger roller is not limited, so the user's installation direction is not limited, and the wiring port direction is not affected whether the switch is installed on the left side or the right side of the conveying belt.

[0062] As shown in Figure 8 and Figure 9 The utility model discloses the cover shaft sleeve 14 is connected between the one end of deflection shaft 21 away from trigger roller set 20 and the shell, the cover shaft sleeve 15 is connected between the one end of deflection shaft 21 adjacent to trigger roller set 20 and the shell, the front end between cover shaft sleeve 15 and deflection shaft 21 is connected with lip seal 18, and the inside between cover shaft sleeve 15 and deflection shaft 21 is connected with O type seal 17.

[0063] As shown in Figure 8 and Figure 9 The utility model discloses the detachable connection between cam 7 and deflection shaft 21, and specifically adopts the bolt connection.

[0064] As shown in Figure 8 and Figure 9 The utility model discloses the shell includes upper cover 1 and lower shell 2, and upper cover 1 is the hollow body with the opening in the bottom, and lower shell 2 is the hollow body with the opening in the top, and upper cover 1 covers in lower shell 2 and is combined to form the hollow body of upper and lower seal bottoms, and the opening between upper cover 1 and lower shell 2 is provided with sealing ring 16, and the both ends surfaces of lower shell 2 are provided with wiring hole 3 that communicates with the inside, and the wiring hole 3 is threadedly connected with waterproof joint, and the top surface of upper cover 1 is embedded with indicating lamp 4 that is connected with the signal of microswitch 10.

[0065] It has to be noted that, as used herein, such terms as "including", "including a", "having", "comprising", "containing", or any other similar term are intended to be encompassing for a passage, a method, an article, or an apparatus that fails to explicitly disclose separate instances of the listed elements. In other words, such terms are to be interpreted in the context as specifying instances of the listed elements but do not preclude the presence of additional elements in the passage, the method, the article, or the apparatus that are either listed elements or additional elements inherent to such passage, method, article, or apparatus.

[0066] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. Conveyor protection switch comprising a housing, characterized in that: A micro switch (10) is provided at the upper inner end of the housing. A reset shaft (11) that is rotatably connected to the housing is provided below the micro switch (10). A cam (7) with a protrusion that contacts the micro switch (10) is connected to the reset shaft (11). A spring plate (12) is connected between the cam (7) and the bottom of the housing. One end of the reset shaft (11) extends out of the housing and is connected to a reset rod (6). The bottom surface of the cam (7) has a fan-shaped groove coaxial with the reset shaft (11), and the inner bottom of the housing has a boss, with the end of the boss located inside the fan-shaped groove of the cam (7). A trigger shaft (13) is provided below the cam (7) and is rotatably connected to the housing. A trigger shaft sleeve (9) is connected to the trigger shaft (13), and a paddle (8) connected to the cam (7) is connected to the trigger shaft sleeve (9). The outer surface of the cam (7) has fan-shaped holes on both sides that are coaxial and symmetrical with the reset shaft (11). The shape of the paddle (8) is "C" shaped and both ends face the cam (7). The end of the paddle (8) is connected to a pin (19) that moves in the fan-shaped hole of the cam (7). One end of the trigger shaft (13) extends out of the housing and is connected to the trigger rod (5). The extension direction of the trigger shaft (13) is opposite to that of the reset shaft (11), that is, the trigger rod (5) and the reset rod (6) are located on the front and rear sides of the housing, respectively.

2. The conveyor protection switch of claim 1, wherein: A micro switch (10) is provided at the upper part of the inner shell. At least two micro switches (10) are designed. A rotary shaft (21) connected to the shell is provided below the micro switch (10). A cam (7) corresponding to the micro switch (10) is connected on the rotary shaft (21). The protrusion of the cam (7) contacts the micro switch (10). A torsion spring (22) is connected between the rotating shaft (21) and the outer casing. One end of the rotary shaft (21) extends out of the housing and is connected to a trigger roller assembly (20).

3. The conveyor protection switch of claim 1, wherein: The trigger rod (5) and the trigger shaft (13) are detachably connected, specifically by bolts. The top end of the trigger rod (5) has a sleeve hole for tying a rope.

4. The conveyor protection switch of claim 1, wherein: When the spring sheet (12) is not triggered, the direction of the force is below the reset shaft (11), and when the spring sheet (12) is triggered, the direction of the force is above the reset shaft (11).

5. The conveyor protection switch of claim 1, wherein: The end of the reset shaft (11) away from the reset rod (6) is connected to the outer casing by a cover sleeve (14). The end of the reset shaft (11) adjacent to the reset rod (6) is connected to the outer casing by a through cover sleeve (15). A lip seal (18) is connected between the front end of the through cover sleeve (15) and the reset shaft (11). An O-ring seal (17) is connected between the inside of the through cover sleeve (15) and the reset shaft (11).

6. The conveyor protection switch of claim 1, wherein: The trigger shaft (13) is connected with the cover sleeve (14) between the outer shell and the end away from the trigger lever (5), and the trigger shaft (13) is connected with the cover sleeve (15) between the outer shell and the end adjacent to the trigger lever (5), the front end of the cover sleeve (15) is connected with the lip seal (18) between the trigger shaft (13), and the inside of the cover sleeve (15) is connected with the O-shaped seal (17) between the trigger shaft (13).

7. The conveyor protection switch of claim 2, wherein: The rotary shaft (21) is connected with the cover sleeve (14) between the outer shell and the end away from the trigger roller group (20), and the rotary shaft (21) is connected with the cover sleeve (15) between the outer shell and the end adjacent to the trigger roller group (20), the front end of the cover sleeve (15) is connected with the lip seal (18) between the rotary shaft (21), and the inside of the cover sleeve (15) is connected with the O-shaped seal (17) between the rotary shaft (21).

8. The conveyor protection switch of claim 1, wherein: The outer shell comprises the upper cover (1) and the lower shell (2), the upper cover (1) is a hollow body with an opening at the bottom, the lower shell (2) is a hollow body with an opening at the top, the upper cover (1) covers the lower shell (2) to form a hollow body with a bottom, and a sealing ring (16) is arranged between the openings of the upper cover (1) and the lower shell (2).

9. The conveyor protection switch of claim 8, wherein: Both ends of the lower shell (2) are provided with wire holes (3) communicating with the inside, and the wire holes (3) are threadedly connected with waterproof joints, and the top surface of the upper cover (1) is embedded with an indicating lamp (4) connected with a micro switch (10).

10. The conveyor protection switch of claim 2, wherein: The cam (7) and the rotary shaft (21) are detachably connected, and are connected by bolts.

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