A cam self-locking braking device

Abstract

This utility model discloses a cam self-locking braking device. A speed measuring mechanism monitors the real-time speed of the monorail crane and transmits the speed signal to the controller. When the real-time speed exceeds the set speed, braking is triggered. The controller sends a trigger signal to the electric cylinder, causing the electric cylinder's power output shaft to extend. The stop block on the push rod moves, and the ratchet is unobstructed. Under the torque of the torsion spring, the ratchet rotates, driving the paired cams to rotate relative to each other. This causes the cams to come close to the surface of the rail web, and the sliding friction causes the paired cams to rotate tighter and tighter, forming a self-locking grip on the rail. This allows the monorail crane connected to this device to achieve reliable braking in a short time.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty braking technology, and in particular to a cam self-locking braking device. Background Technology

[0002] Monorail locomotives are a new type of mine transportation equipment that has been gradually adopted in coal mines. However, during operation, the high failure rate and insufficient reliability of their braking systems compromise operational safety. In emergency situations where the monorail locomotive loses speed control, a device capable of reliably braking it in a short time is crucial, but such a braking device currently does not exist. (Utility Model Content)

[0003] This invention provides a cam self-locking braking device that can achieve reliable braking in a short time.

[0004] This utility model provides a cam self-locking braking device, comprising: a left cam, a right cam, a left camshaft, a right camshaft, a left ratchet, a right ratchet, an electric cylinder, a push rod, a stop block, a left shift fork, a right shift fork, a left shift fork shaft, a right shift fork shaft, a left torsion spring, a right torsion spring, a left torsion spring hook, a right torsion spring hook, a left torsion spring pin, a right torsion spring pin, a frame, a speed measuring mechanism, and a controller; the left cam and the right cam are symmetrically arranged on both sides of a track; the first end of the left camshaft passes through the left cam, and the second end of the left camshaft passes through the left ratchet; the left torsion spring hook is disposed on the frame; the left torsion spring pin is disposed on the left ratchet; the left torsion spring is sleeved on the left camshaft, the first end of the left torsion spring is disposed in the left torsion spring hook, and the second end of the left torsion spring is disposed on the left torsion spring pin; the first end of the right camshaft passes through the right cam, and the second end of the right camshaft passes through the right ratchet; the right torsion spring hook is disposed on the... The frame is as follows: the right torsion spring pin is mounted on the right ratchet; the right torsion spring is sleeved on the right camshaft, with the first end of the right torsion spring located in the right torsion spring hook and the second end of the right torsion spring mounted on the right torsion spring pin; the push rod is connected to the front end of the power output shaft of the electric cylinder; the stop block is mounted on the push rod; the left shift fork shaft is mounted on the frame; the left shift fork shaft passes through the central through hole of the left shift fork; the first end of the left shift fork is limited by the stop block, and the second end of the left shift fork limits the left ratchet; the right shift fork shaft is mounted on the frame; the right shift fork shaft passes through the central through hole of the right shift fork; the first end of the right shift fork is limited by the stop block, and the second end of the right shift fork limits the right ratchet; the speed measuring mechanism is connected to the frame; the signal output terminal of the speed measuring mechanism is communicatively connected to the signal input terminal of the controller, and the signal output terminal of the controller is communicatively connected to the signal input terminal of the electric cylinder.

[0005] Specifically, it also includes: an upper left bushing, a lower left bushing, an upper right bushing, and a lower right bushing; an upper left through hole and an upper right through hole are provided on the top surface of the frame, and a lower left through hole and a lower right through hole are provided on the bottom surface of the frame; the upper left bushing is disposed in the upper left through hole; the lower left bushing is disposed in the lower left through hole; the upper right bushing is disposed in the upper right through hole; the lower right bushing is disposed in the lower right through hole; the first end of the left camshaft passes through the upper left bushing, and the second end of the left camshaft passes through the lower left bushing; the first end of the right camshaft passes through the upper right bushing, and the second end of the right camshaft passes through the lower right bushing.

[0006] Specifically, it also includes: a push rod support; the push rod support is disposed on the frame; the push rod passes through the central through hole of the push rod support.

[0007] Specifically, the speed measuring mechanism includes: a left roller, a right roller, a left bracket, a right bracket, a base, and a spring; the left roller and the right roller are respectively disposed on both sides of the track, the left roller is disposed in the left bracket, and the right roller is disposed in the right bracket; an encoder is disposed on the rotating shaft of the left roller and / or the right roller; the signal output terminal of the encoder is communicatively connected to the signal input terminal of the controller; the lower ends of the left bracket and the right bracket are respectively connected to the left support and the right support on the base for limited rotation; the spring connects the left bracket and the right bracket; and the base is connected to the frame.

[0008] Specifically, both the left support and the right support have a cylindrical structure; the lower ends of both the left support and the right support are pivot structures, and the two ends of the pivot structure are flanges; the middle part of the pivot structure is located in the cylindrical structure.

[0009] Specifically, the cylindrical structure is composed of an upper half-cylinder and a lower half-cylinder that can be detachably connected.

[0010] Specifically, the upper and lower semi-cylinders are detachably connected by bolts.

[0011] One or more technical solutions provided in this utility model have at least the following technical effects or advantages:

[0012] The real-time speed of the monorail crane is monitored by a speed measuring mechanism and the speed signal is transmitted to the controller. When the real-time speed exceeds the set speed, braking is triggered. The controller sends a trigger signal to the electric cylinder, the power output shaft of the electric cylinder extends, and the stop block set on the push rod moves, with the ratchet unobstructed. Under the torque of the torsion spring, the ratchet rotates, thereby driving the paired cams to rotate relative to each other, so that the cams are close to the surface of the rail web. The sliding friction makes the paired cams rotate tighter and tighter, forming a self-locking rail grip, thus enabling the monorail crane connected to this device to achieve reliable braking in a short time. Attached Figure Description

[0013] Figure 1 A schematic diagram of the cam self-locking braking device provided in an embodiment of the present utility model from a first-view perspective;

[0014] Figure 2 A schematic diagram of the cam self-locking braking device provided in an embodiment of the present utility model from a second perspective.

[0015] Figure 3 A partial enlarged view of the cam self-locking braking device provided in an embodiment of this utility model;

[0016] Figure 4 A bottom view of the cam self-locking braking device provided in the embodiment of this utility model in the non-braking state;

[0017] Figure 5 A bottom view of the cam self-locking braking device provided in the embodiment of this utility model in the braking state;

[0018] Figure 6 A top view of the cam self-locking braking device provided in the embodiment of this utility model in the braking state;

[0019] Figure 7 A schematic diagram of the speed measuring mechanism in the cam self-locking braking device provided in this embodiment of the utility model;

[0020] Among them, 1-left cam, 2-right cam, 3-left camshaft, 4-right camshaft, 5-left ratchet, 6-right ratchet, 7-electric cylinder, 8-push rod, 9-stop block, 10-left shift fork, 11-right shift fork, 12-left shift fork shaft, 13-right shift fork shaft, 14-left torsion spring, 15-right torsion spring, 16-left torsion spring hook, 17-left torsion spring pin, 18-frame, 19-encoder, 20-rail, 21-push rod support, 22-left roller, 23-right roller, 24-left bracket, 25-right bracket, 26-base, 27-spring, 28-cylindrical structure, 29-flange. Detailed Implementation

[0021] This utility model provides a cam self-locking braking device that can achieve reliable braking in a short time.

[0022] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figures 1-6As shown, the cam self-locking braking device provided in this embodiment includes: a left cam 1, a right cam 2, a left camshaft 3, a right camshaft 4, a left ratchet 5, a right ratchet 6, an electric cylinder 7, a push rod 8, a stop block 9, a left shift fork 10, a right shift fork 11, a left shift fork shaft 12, a right shift fork shaft 13, a left torsion spring 14, a right torsion spring 15, a left torsion spring hook 16, a right torsion spring hook, a left torsion spring pin 17, a right torsion spring pin, a frame 18, a speed measuring mechanism, and a controller; the left cam 1 and the right cam... 2. Symmetrically arranged on both sides of track 20; the first end of the left camshaft 3 passes through the left cam 1, and the second end of the left camshaft 3 passes through the left ratchet 5; the left torsion spring hook 16 is set on the frame 18; the left torsion spring pin 17 is set on the left ratchet 5; the left torsion spring 14 is sleeved on the left camshaft 3, the first end of the left torsion spring 14 is set in the left torsion spring hook 16, and the second end of the left torsion spring 14 is set on the left torsion spring pin 17; the first end of the right camshaft 4 passes through the right cam 2, and the right camshaft 4... The second end of the right torsion spring is inserted into the right ratchet 6; the right torsion spring hook is set on the frame 18; the right torsion spring pin is set on the right ratchet 6; the right torsion spring 15 is sleeved on the right camshaft 4, the first end of the right torsion spring 15 is set in the right torsion spring hook, and the second end of the right torsion spring 15 is set on the right torsion spring pin; the push rod 8 is connected to the front end of the power output shaft of the electric cylinder 7; the stop block 9 is set on the push rod 8; the left shift fork shaft 12 is set on the frame 18; the left shift fork shaft 12 is inserted into the center through hole of the left shift fork 10; the left shift fork 10... The first end of the left fork 10 is limited by the stop block 9, and the second end of the left shift fork 10 is limited by the left ratchet 5. The right shift fork shaft 13 is mounted on the frame 18. The right shift fork shaft 13 passes through the central through hole of the right shift fork 11. The first end of the right shift fork 11 is limited by the stop block 9, and the second end of the right shift fork 11 is limited by the right ratchet 6. The speed measuring mechanism is connected to the frame 18. The signal output terminal of the speed measuring mechanism is communicatively connected to the signal input terminal of the controller, and the signal output terminal of the controller is communicatively connected to the signal input terminal of the electric cylinder 7. The frame 18 is connected to the monorail crane body. The speed measuring mechanism is used to monitor the forward speed of the monorail crane in real time. The controller is used to control the power output shaft of the electric cylinder 7 to extend and trigger braking when the forward speed of the monorail crane is greater than the set speed. The frame 18 is used to bear the force transmitted during braking. When the cam is not braking, the power output shaft of the electric cylinder 7 retracts, the first end of the shift fork is limited by the stop block 9, and the second end of the shift fork blocks one tooth of the ratchet. Although the torsion spring has applied torque to the ratchet, the ratchet cannot rotate in the direction of torque, and there is a gap between the left and right cams and the track 20. When the controller controls the power output shaft of the electric cylinder 7 to extend, the stop block 9 moves forward, and the first end of the shift fork also rotates. The second end of the shift fork disengages from the ratchet, and the ratchet rotates without constraint under the action of the torsion spring torque. The left camshaft 3 and the right camshaft 4 drive the left cam 1 and the right cam 2 to rotate in opposite directions, so that they are pressed against the surface of the track 20 to achieve braking.Specifically, looking down from above in the direction of travel of the monorail crane, the torque applied by the right torsion spring 15 to the right cam 2 is counterclockwise, and the torque applied by the left torsion spring 14 to the left cam 1 is clockwise. When the brake is triggered, as the cam rotates, the gap between its outer contour surface and the rail web surface of the rail 20 becomes smaller and smaller until they are pressed together. This generates sliding friction between the cam and the rail web surface of the rail 20. This friction causes the cam to continue rotating and becomes tighter and tighter until the cam moves forward and stops, and the braking is completed.

[0024] To improve the stability of the cam self-locking braking device structure provided in this embodiment of the utility model, it further includes: an upper left bushing, a lower left bushing, an upper right bushing, and a lower right bushing; an upper left through hole and an upper right through hole are provided on the top surface of the frame 18, and a lower left through hole and a lower right through hole are provided on the bottom surface of the frame 18; the upper left bushing is disposed in the upper left through hole; the lower left bushing is disposed in the lower left through hole; the upper right bushing is disposed in the upper right through hole; the lower right bushing is disposed in the lower right through hole; the first end of the left camshaft 3 passes through the upper left bushing, and the second end of the left camshaft 3 passes through the lower left bushing; the first end of the right camshaft 4 passes through the upper right bushing, and the second end of the right camshaft 4 passes through the lower right bushing.

[0025] To further improve the stability of the cam self-locking braking device structure provided in this embodiment of the present invention, it further includes: a push rod support 21; the push rod support 21 is disposed on the frame 18; the push rod 8 passes through the central through hole of the push rod support 21.

[0026] The structure of the speed measuring mechanism is described in detail, such as... Figure 7 As shown, the speed measuring mechanism includes: a left roller 22, a right roller 23, a left support 24, a right support 25, a base 26, and a spring 27. The left roller 22 and right roller 23 are respectively disposed on both sides of the track 20, with the left roller 22 housed in the left support 24 and the right roller 23 housed in the right support 25. An encoder 19 is mounted on the rotating shaft of the left roller 22 and / or the right roller 23. The signal output terminal of the encoder 19 is communicatively connected to the signal input terminal of the controller. The lower ends of the left support 24 and right support 25 are respectively connected to the left and right supports on the base 26 for limited rotation. The spring 27 connects the left support 24 and right support 25. The base 26 is connected to the frame 18. The spring 27 in the speed measuring mechanism tensions the left support 24 and right support 25 on both sides of the track 20, causing the left roller 22 and right roller 23 on both sides of the track 20 to adhere tightly to the surface of the track web, transmitting the rotation to the encoder 19 through the rotating shaft to achieve speed measurement.

[0027] The structure of the lower ends of the left support 24 and the right support 25 being rotatably connected to the left and right supports on the base 26 is described in detail. Both the left and right supports have cylindrical structures 28. The lower ends of the left support 24 and the right support 25 are both pivot structures, with flanges 29 at both ends. The middle part of the pivot structure is located in the cylindrical structure 28. The inner diameter of the cylindrical structure 28 is larger than the outer diameter of the middle part but smaller than the outer diameter of the flange 29. The flange 29 enables rotatable limiting between the support and the base, preventing axial displacement of the left support 24 and the right support 25 during movement, thereby improving the accuracy of speed measurement.

[0028] The structure of the cylindrical structure 28 is described in detail. The cylindrical structure 28 is composed of an upper half-cylinder and a lower half-cylinder that can be detachably connected.

[0029] The structure of cylindrical structure 28 is further explained. The upper and lower semi-cylinders are detachably connected by bolts. In use, the middle part of the pivot structure at the lower end of the bracket is first inserted into the lower semi-cylinder, and then the upper semi-cylinder is fastened and connected to the lower semi-cylinder with bolts. The middle part of the pivot structure at the lower end of the bracket can then rotate in the through hole formed by the upper and lower semi-cylinders.

[0030] It should be noted that, in practical applications, a set of cam self-locking braking devices provided in this utility model embodiment should be symmetrically installed at the head and tail of the monorail crane body, respectively for protection when the monorail crane is running uphill and downhill.

[0031] The working principle of the cam self-locking braking device provided in the embodiment of this utility model will be explained in detail below:

[0032] When the monorail crane moves forward, the left roller 22 and right roller 23 roll, and the shaft rotates synchronously. The encoder 19 detects the shaft speed and transmits the speed signal to the controller. When the forward speed of the monorail crane exceeds the set value (3.5 m / s in this embodiment), the controller controls the power output shaft of the electric cylinder 7 to extend. The stop block 9 on the push rod 8 moves forward, and the first end of the shift fork rotates accordingly. The second end of the shift fork disengages from the ratchet. The ratchet rotates under the torque of the torsion spring, which drives the left cam 1 and right cam 2 to rotate in opposite directions through the left cam shaft 3 and right cam shaft 4, respectively, so that they are pressed against the surface of the rail web of the track 20 to achieve self-locking braking.

[0033] In summary, the cam self-locking braking device provided in this embodiment of the present invention can trigger the rotation of a pair of cams located on both sides of the track 20 and self-lock onto the track 20 when the running speed of the monorail crane is out of control (greater than the set maximum speed), thereby achieving self-locking and clamping braking, so that the monorail crane connected to this device can achieve reliable braking in a short time.

[0034] Any aspects of this utility model not described in detail are well-known to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cam self-locking braking device, characterized in that, include: The system comprises a left cam, a right cam, a left camshaft, a right camshaft, a left ratchet, a right ratchet, an electric cylinder, a push rod, a stop block, a left shift fork, a right shift fork, a left shift fork shaft, a right shift fork shaft, a left torsion spring, a right torsion spring, a left torsion spring hook, a right torsion spring hook, a left torsion spring pin, a right torsion spring pin, a frame, a speed measuring mechanism, and a controller. The left and right cams are symmetrically arranged on both sides of the track. The first end of the left camshaft passes through the left cam, and the second end of the left camshaft passes through the left ratchet. The left torsion spring hook is mounted on the frame. The left torsion spring pin is mounted on the left ratchet. The left torsion spring is sleeved on the left camshaft, with its first end positioned in the left torsion spring hook and its second end positioned on the left torsion spring pin. The first end of the right camshaft passes through the right cam, and its second end passes through the right ratchet. The right torsion spring hook is mounted on the frame. The right torsion spring pin... The right torsion spring is mounted on the right ratchet; the right torsion spring is sleeved on the right camshaft, with its first end positioned in the right torsion spring hook and its second end positioned on the right torsion spring pin; the push rod is connected to the front end of the power output shaft of the electric cylinder; the stop block is mounted on the push rod; the left shift fork shaft is mounted on the frame; the left shift fork shaft passes through the central through hole of the left shift fork; the first end of the left shift fork is limited by the stop block, and the second end of the left shift fork limits the left ratchet; the right shift fork shaft is mounted on the frame; the right shift fork shaft passes through the central through hole of the right shift fork; the first end of the right shift fork is limited by the stop block, and the second end of the right shift fork limits the right ratchet; the speed measuring mechanism is connected to the frame; the signal output terminal of the speed measuring mechanism is communicatively connected to the signal input terminal of the controller, and the signal output terminal of the controller is communicatively connected to the signal input terminal of the electric cylinder.

2. The cam self-locking braking device as described in claim 1, characterized in that, Also includes: The frame comprises an upper left bushing, a lower left bushing, an upper right bushing, and a lower right bushing; a left upper through hole and a right upper through hole are provided on the top surface of the frame, and a left lower through hole and a right lower through hole are provided on the bottom surface of the frame; the upper left bushing is disposed in the upper left through hole; the lower left bushing is disposed in the lower left through hole; the upper right bushing is disposed in the upper right through hole; the lower right bushing is disposed in the lower right through hole; the first end of the left camshaft passes through the upper left bushing, and the second end of the left camshaft passes through the lower left bushing; the first end of the right camshaft passes through the upper right bushing, and the second end of the right camshaft passes through the lower right bushing.

3. The cam self-locking braking device as described in claim 1, characterized in that, Also includes: A push rod support; the push rod support is mounted on the frame; the push rod passes through the central through hole of the push rod support.

4. The cam self-locking braking device as described in claim 1, characterized in that, The speed measuring mechanism includes: a left roller, a right roller, a left bracket, a right bracket, a base, and a spring; the left roller and the right roller are respectively disposed on both sides of the track, the left roller is disposed in the left bracket, and the right roller is disposed in the right bracket; an encoder is disposed on the rotating shaft of the left roller and / or the right roller; the signal output terminal of the encoder is communicatively connected to the signal input terminal of the controller; the lower ends of the left bracket and the right bracket are respectively connected to the left support and the right support on the base for limited rotation; the spring connects the left bracket and the right bracket; the base is connected to the frame.

5. The cam self-locking braking device as described in claim 4, characterized in that, Both the left support and the right support have a cylindrical structure; the lower ends of both the left support and the right support are pivot structures, and the two ends of the pivot structure are flanges; the middle part of the pivot structure is located in the cylindrical structure.

6. The cam self-locking braking device as described in claim 5, characterized in that, The cylindrical structure is composed of a detachable upper cylinder and a lower cylinder.

7. The cam self-locking braking device as described in claim 6, characterized in that, The upper and lower semi-cylinders are detachably connected by bolts.

Images