CN114471787A

CN114471787A - Abrasive belt protection device and grinding equipment

Info

Publication number: CN114471787A
Application number: CN202011154318.7A
Authority: CN
Inventors: 王彪; 邱小辉
Original assignee: Mai Dao Intelligent Grain Co ltd
Current assignee: Mai Dao Intelligent Grain Co ltd; Quzhou Kumisainuo Grains Machinery Manufacturing Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2022-05-13

Abstract

The invention provides an abrasive belt protection device and grinding equipment, and belongs to the field of grinding devices. The invention provides an abrasive belt protection device, which comprises: the induction mechanism is arranged at the bottom of the abrasive belt and located between the main roller and the tensioning roller, the induction mechanism is provided with a trigger part and an induction switch matched with the trigger part, the position of the trigger part in the vertical direction corresponds to the dangerous position of the bottom edge of the abrasive belt, the induction switch is connected with the main power supply and the control module in series, and when the abrasive belt moves downwards to the position where the height of the bottom edge of the abrasive belt is lower than the height of the dangerous position, the induction switch is triggered to be switched off, and the control module is further switched off from the main power supply.

Description

Abrasive belt protection device and grinding equipment

Technical Field

The invention relates to a grinding device, in particular to an abrasive belt protection device and grinding equipment.

Background

A milling apparatus is an apparatus for milling large particulate matter into small particulate matter. For example, a rice mill is a common milling device, which is used to peel brown rice to form polished rice.

The conventional rice mill usually adopts an extrusion principle, which easily causes rice grains to be broken. In order to reduce the breaking of rice grains, some prior art devices for peeling by belt grinding have appeared. The grinding equipment adopting the abrasive belt comprises a frame, a feeding device, a discharging device, a main roller, the abrasive belt sleeved on the main roller and a whitening chamber surrounding the main roller. In the rice mill, the roller is vertically arranged, so the abrasive belt is influenced by gravity and inevitably slides downwards. If the interference is not carried out, the moving abrasive belt can cut other parts, and seriously, the abrasive belt can be torn after touching hard objects in the downward sliding process, so that the equipment is easy to damage, and the production efficiency is influenced.

Disclosure of Invention

In order to solve the problems, the invention provides an abrasive belt protection device and grinding equipment comprising the abrasive belt protection device, which can prevent an abrasive belt from continuously sliding downwards to cause tearing and cutting other parts, and adopts the following technical scheme:

the invention provides an abrasive belt protection device which is arranged in a grinding device, the grinding device is provided with a main power supply, a vertically arranged main roller, a vertically arranged tensioning roller, an abrasive belt arranged at the outer sides of the main roller and the tensioning roller and a control module which is electrically connected with the main power supply and is used for controlling the rotation of the main roller, and the abrasive belt protection device is characterized by comprising: the induction mechanism is arranged at the bottom of the abrasive belt and located between the main roller and the tensioning roller, the induction mechanism is provided with a trigger part and an induction switch matched with the trigger part, the position of the trigger part in the vertical direction corresponds to the dangerous position of the bottom edge of the abrasive belt, the induction switch is connected with the main power supply and the control module in series, and when the abrasive belt moves downwards to the position where the height of the bottom edge of the abrasive belt is lower than the height of the dangerous position, the induction switch is triggered to be switched off, and the control module is further switched off from the main power supply.

The abrasive belt protection device provided by the invention can also be characterized by further comprising: the installation mechanism is used for installing the induction mechanism, the trigger piece is a touch rod, one end of the touch rod is a fixed end, the other end of the touch rod is a free end, the fixed end is installed in the installation mechanism and can rotate in a vertical plane, the free end extends to the lower side of the sand belt, the induction switch is a micro switch, the micro switch is fixedly installed in the installation mechanism and is located at the bottom of the touch rod, the touch rod and a public end of the micro switch are connected in series in a circuit connected with the main power supply and the control module through the normally closed end and the public end of the micro switch, a contact point which faces the touch rod and is matched with the touch rod is arranged, and the micro switch is disconnected when one contact point is pressed down.

The abrasive belt protection device provided by the invention can also be characterized in that the microswitch is also provided with an action reed corresponding to the contact, one end of the action reed is fixedly connected to the shell of the microswitch, and the other end of the action reed is positioned between the touch rod and the contact and is abutted against the touch rod.

The belt protection arrangement according to the invention can also be characterized in that the fixed end of the touch rod is located outside the belt.

The abrasive belt protection device provided by the invention can also be characterized in that the grinding equipment is provided with a frame, the mounting mechanism is arranged on the frame and is provided with a first mounting seat and a second mounting seat, the first mounting seat is fixedly arranged on the frame, the second mounting seat is rotatably arranged on the first mounting seat, and the touch rod and the inductive switch are arranged on the second mounting seat.

The abrasive belt protection device provided by the invention can also have the characteristic that the mounting mechanism is also provided with a limiting piece, the corresponding positions of the first mounting seat and the second mounting seat are respectively provided with a first limiting hole and a second limiting hole, and the limiting piece is inserted into the first limiting hole and the second limiting hole and is used for limiting the second mounting seat.

The belt protection arrangement according to the invention can also be characterized in that the mounting means are fixedly connected to the machine frame via a damping element.

The invention provides a milling apparatus, characterised in that it comprises: a main power supply, a vertically arranged main roller, a vertically arranged tensioning roller, an abrasive belt arranged at the outer sides of the main roller and the tensioning roller, a control module electrically connected with the main power supply and used for controlling the rotation of the main roller and an abrasive belt protection device,

wherein, the abrasive belt protection device is any one of the abrasive belt protection devices.

Action and Effect of the invention

The abrasive belt protection device is provided with a sensing mechanism for controlling the on-off of a circuit of a control module communicated with a main power supply, the sensing mechanism is provided with a sensing switch and a trigger piece matched with the sensing switch, the free end of the trigger piece extends to the bottom of an abrasive belt, and when the abrasive belt slides downwards to the position that the bottom edge of the abrasive belt is lower than a dangerous position in the running process, the trigger piece is triggered and the sensing switch is disconnected, so that the control module is disconnected with the main power supply, the rice milling device stops working, and the abrasive belt stops working. Under the tensioning action of the tensioning roller, the abrasive belt does not slide down any more, so that the abrasive belt is prevented from sliding down to cut other parts and being torn after touching hard objects.

Drawings

FIG. 1 is a schematic view of the structure of a milling apparatus according to an embodiment of the present invention;

figure 2 is a schematic view of the mounting of the detection means and the protection device in the milling apparatus according to an embodiment of the invention;

FIG. 3 is a schematic view of the structure of the main roller, the tension roller and the abrasive belt in the embodiment of the invention;

FIG. 4 is a side view of an offset structure in a belt deflection adjustment apparatus in an embodiment of the invention;

FIG. 5 is a top view of an offset adjustment structure in a belt deflection adjustment apparatus in an embodiment of the present invention;

figure 6 is a side view of a tensioning mechanism in a belt deflection adjustment arrangement according to an embodiment of the invention;

figure 7 is a top view of a tensioning mechanism in a belt deflection adjustment apparatus in an embodiment of the invention;

FIG. 8 is a top view of a governor mechanism in a belt deflection adjustment apparatus in an embodiment of the present invention;

FIG. 9 is a side view of a governor mechanism in a belt deflection adjustment apparatus in an embodiment of the invention;

figure 10 is a schematic view of the mechanism of the detection mechanism in the belt deflection adjustment arrangement according to an embodiment of the invention;

FIG. 11 is a schematic view of the configuration of the photoelectric switch in the belt deflection adjusting apparatus according to the embodiment of the present invention; and

fig. 12 is a schematic view of the construction of a belt guard according to an embodiment of the invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.

< example >

FIG. 1 is a schematic view of the structure of a milling apparatus in an embodiment of the present invention. Figure 2 is a schematic view of the installation of the detection mechanism and the protection device in the milling apparatus according to an embodiment of the present invention. Fig. 3 is a schematic structural view of a main drum, a tension drum and a sanding belt in an embodiment of the present invention.

The embodiment provides a milling device, which comprises a rice milling device 1, an abrasive belt deviation adjusting device 2, an abrasive belt protecting device 3, a control module 4 (not shown in figures 1-3) and a frame (not shown in figures).

The control module 4 is used for controlling the rice milling device 1 and the abrasive belt deviation adjusting device 2 to act.

As shown in fig. 1 to 3, the rice milling apparatus 1 includes a main drum 10, a tension drum 20, and an abrasive belt 30.

The main drum 10 includes a drum body 11, a main drum shaft 12, an upper cover plate 13, a lower cover plate 14, and a partition plate 15.

The cylinder 11 is cylindrical and extends in the vertical direction, and the end face of the cylinder is parallel to the horizontal plane. The main drum shaft 12 is arranged at the axis of the drum body in a penetrating way and is used for being driven by the rotary driving mechanism to drive the drum body 11 to rotate. The upper cover 13 is installed above the end surface of the cylinder 11 in fig. 2, and the lower cover 14 is installed below the end surface of the cylinder 11 in fig. 2. The upper and

lower cover plates

13 and 14 are rotatably coupled with respect to the drum body 11 and the main drum shaft 12, i.e., the upper and

lower cover plates

13 and 14 do not follow the rotation when the drum body 11 and the main drum shaft 12 rotate. The partition 15 is disposed between the main drum 10 and the tension drum 20, and both ends of the partition 15 are fixedly mounted on the upper cover plate 13 and the lower cover plate 14, respectively, and the partition 15 is used for isolating the main drum 10 from the tension drum 20.

The tension drum 20 includes a tension cylinder 21 and a housing 22.

The tension cylinder 21 is cylindrical, has a diameter smaller than that of the cylinder 11, and has an end surface parallel to that of the cylinder 11 of the main drum 10. The housing 22 is rotatably connected to the tensioning cylinder 21, i.e. the housing 22 does not follow the rotation when the tensioning cylinder 21 is rotated. The cover 22 forms a half-enclosed structure with respect to the tension cylinder 21, specifically, the cover 22 covers a part of the side surface of the tension cylinder 21, but the inner side surface of the cover 22 close to the tension cylinder 21 does not come into contact with the tension cylinder 21 when the tension cylinder 21 rotates. The specific area of the cover 22 covering the tensioning cylinder 21 can be set according to specific requirements, and it is preferable that the contact area between the abrasive belt 30 and the tensioning cylinder 21 is not reduced. In the present embodiment, the cover 22 covers 50% of the side surface of the tension cylinder 21 close to the main drum 10.

The abrasive belt 30 is sleeved outside the cylinder body 11 of the main roller 10 and the tensioning cylinder body 21 of the tensioning roller 20 to form a complete abrasive roller structure.

The sanding belt deviation adjusting device 2 is used for adjusting the position of the sanding belt 30 in the vertical direction and comprises a deviation adjusting mechanism 40, a tensioning mechanism 50, a speed adjusting mechanism 60 and a detection mechanism 70.

Figure 4 is a side view of an offset structure in a belt deflection adjustment apparatus according to an embodiment of the invention. Figure 5 is a top view of an offset structure in a belt deflection adjustment apparatus according to an embodiment of the invention.

As shown in fig. 4-5, the offset adjustment mechanism 40 includes: an offset adjusting bottom plate 41, an offset adjusting rotating shaft 42, an offset adjusting rotating shaft cover 43, a first swing rod 44, an offset adjusting collision block 45, an offset adjusting rotating block 46, a second swing rod 47 and an offset adjusting driving piece 48.

The offset bottom plate 41 is disposed above the end surface of the main drum 10 and is disposed parallel to the end surface of the main drum 10. The deviation-adjusting bottom plate 41 has a strip-shaped hole for the second swing link 47 to pass through and swing, and in other embodiments, the shape and size of the hole can be adjusted adaptively according to the actual swing range of the second swing link 47.

The deviation-adjusting rotating shaft 42 is fixedly arranged on the upper surface of the deviation-adjusting bottom plate 41.

The deflection adjusting shaft cover 43 covers the deflection adjusting shaft 42 to prevent foreign matters from entering the deflection adjusting shaft 42, thereby ensuring the reliability of the operation of the deflection adjusting shaft 42.

The first swing link 44 is disposed in parallel with the offset base plate 41, and the first swing link 44 is disposed on the offset rotating shaft 42 in a penetrating manner so that the first swing link 44 can rotate around the offset rotating shaft 42 as an axis. The distance between the two ends of the first swing link 44 and the offset shaft 42 can be adjusted according to actual conditions, and in this embodiment, the distance between the two ends of the first swing link and the offset shaft 42 is equal.

The offset-adjusting collision block 45 is arranged at one end of the first swing rod 44, and the bottom of the offset-adjusting collision block 45 is not contacted with the offset-adjusting bottom plate 41, so that the resistance received by the first swing rod 44 during rotation can be reduced. In this embodiment, the offset-adjusting collision block 45 has a larger surface area, so that the offset-adjusting driving member 48 can accurately push the offset-adjusting collision block 45 to rotate around the offset-adjusting rotation shaft 42.

The offset turning block 46 is arranged at the other end far away from the offset collision block 45, in the embodiment, the offset turning block 46 uses an offset ball head part, an offset ball head cover used for covering the offset ball head part can be arranged on the offset ball head part according to actual conditions, and the offset ball head cover is used for preventing foreign matters from entering the offset ball head part, so that the working reliability of the offset ball head part is ensured.

The second rocker 47 is arranged parallel to the tensioning roller 20. One end of the second swing link 47 is formed with a hook portion, the hook portion is disposed at the bottom of the deviation adjusting rotating block 46 in a penetrating manner, and the other end of the second swing link passes through the deviation adjusting bottom plate 41 and extends downwards. The other end of the second swing link 47 is provided with an offset rotary shaft 401, and the second swing link 47 is connected to the housing 22 of the tension roller 20 through the offset rotary shaft 401. When the second swing link 47 swings, the offset rotary shaft 401 is driven to rotate, so as to drive the tensioning roller 20 and the second swing link 47 to swing synchronously. In this embodiment, a rotary bearing is sleeved on the offset rotary shaft 401.

The offset driver 48 includes: air cylinder 481, air cylinder seat 482, Y-shaped joint 483, double orifice plate 484 and offset cylinder plate 485. The cylinder seat 482 is installed on one side of the deviation-adjusting bottom plate 41 close to the deviation-adjusting bottom plate 41 and is arranged perpendicular to the deviation-adjusting bottom plate 41. The cylinder 481 is mounted on a cylinder block 482, and the cylinder rod is disposed toward the offset base plate 41. The Y-joint 483 is provided at the end of the cylinder rod of the cylinder 481 and is connected to the top of the deflection-adjusting bump block 45 via a double orifice plate 484. Through the connection, when the air cylinder 481 operates, the air cylinder rod extends out to push the Y-shaped joint to move forwards towards the direction of the offset-adjusting collision block 45, and meanwhile, the offset-adjusting collision block 45 is driven to rotate around the offset-adjusting rotating shaft 42 through the double-hole plate 484. The offset cylinder plate 485 is fixed on the offset bottom plate 41 and used for supporting the cylinder 481 and the cylinder seat 482.

Figure 6 is a side view of a tensioning mechanism in a belt deflection adjustment apparatus in an embodiment of the invention. Figure 7 is a top view of a tensioning mechanism in a belt deflection adjustment apparatus in an embodiment of the invention.

As shown in fig. 6-7, tensioning mechanism 50 is for tensioning a sanding belt, comprising: go up tensioning set and tensioning set down, wherein, go up tensioning set and include: upper tensioning cylinder 51, tensioning bottom plate 52, push plate 53, lower tensioning assembly includes: a lower tensioning cylinder 54 and a support bracket 55.

The tension bottom plate 52 is disposed below the deviation-adjusting bottom plate 41 and is disposed parallel to the deviation-adjusting bottom plate 41. The upper surface of the tension base plate 52 is provided with a slide rail, and the extension direction of the slide rail is parallel to the extension direction of the line connecting the axis of the main drum 10 and the axis of the tension drum 20. The bottom of the deviation-adjusting bottom plate 41 is provided with a sliding block matched with the sliding rail on the upper surface of the tensioning bottom plate 52, so that the tensioning bottom plate and the deviation-adjusting bottom plate can be slidably connected. The tension base plate 52 and the upper cover plate 13 may be two independent plates or may be the same plate. In this embodiment, the tension base plate 52 and the upper cover plate 13 are two independent plates.

The upper tensioning cylinder 51 is mounted on the tensioning baseplate 52. The push plate 53 is disposed on the deviation-adjusting bottom plate 41, and when the cylinder rod of the upper tensioning cylinder 51 extends out, the push plate can be pushed, so as to drive the deviation-adjusting bottom plate 41 to move along the slide rail.

The supporting frame 55 is L-shaped and is disposed at the bottom of the second swing link 47. The lower tensioning cylinder 54 is mounted on a support frame 55 with the cylinder rod of the lower tensioning cylinder 54 facing the main drum. When the lower tensioning cylinder 54 is operated, its cylinder rod abuts against the partition 15, and since the partition 15 is fixedly disposed, a reaction force is generated to the cylinder rod, thereby moving the tensioning roller 20 away from the main roller 10.

Figure 8 is a top view of a governor mechanism in a belt deflection adjustment arrangement in an embodiment of the invention. Figure 9 is a side view of a governor mechanism in a belt deflection adjustment arrangement in an embodiment of the invention.

The speed regulating mechanism 60 is used for limiting the rotation amplitude of the first swing link so as to control the speed of ascending or descending the abrasive belt, and comprises a pair of speed regulating members which are arranged on two sides of the offset-adjusting collision block 45 in a mirror-image symmetry mode by taking the first swing link 44 as a symmetry axis.

Each speed adjusting part comprises: backing plate 61, speed governing slider 62, briquetting 63 and speed governing screw 64.

The backing plate 61 is mounted on the deflection regulating base plate 41.

The speed regulation slider 62 is slidably disposed above the backing plate 61, and an edge of the speed regulation slider 62 close to one side of the first swing link 44 and the first swing link 44 form a certain included angle, and in this embodiment, as shown in fig. 8, the width of the speed regulation slider 62 is gradually reduced from left to right. The governor slide 62 serves to define the maximum amplitude of oscillation of the first rocker, and thus of the tensioning roller 20, and thus can be used to define the up-and-down excursion speed of the sanding belt 30. In other embodiments, the bevel edge of the speed regulation slider can also be designed in a stepped or wavy shape, and can also be designed in a bevel edge manner like the embodiment, but the width of the bevel edge is gradually increased from left to right.

The speed regulation screw 64 penetrates through the speed regulation slide block 62, and forms a common screw rod matching with the speed regulation slide block 62, so that the speed regulation slide block is driven to move along the length direction of the speed regulation screw 64 when the speed regulation screw 64 rotates. In this embodiment, the end of the speed adjusting screw 64 far away from the speed adjusting slider 62 is provided with a knob, and the knob is located outside the deviation adjusting bottom plate 41, so that the use of the user can be facilitated.

The pressing block 63 is mounted on the backing plate 61, covers the upper side of the speed regulation slide block 62, and is used for protecting a screw rod structure formed by the speed regulation screw 64 and the speed regulation slide block 62. In this embodiment, the pressure block on the side close to the offset driver 48 is the same as the offset cylinder plate 485. In other embodiments, the pressure block and the offset cylinder plate on the side adjacent to the offset driver may be separate components.

Fig. 10 is a schematic view of the mechanism of the detection mechanism in the belt deflection adjusting device according to an embodiment of the invention. Figure 11 is a schematic view of the configuration of the opto-electronic switch in the belt deflection adjustment arrangement according to an embodiment of the invention.

As shown in fig. 10-11, a detection mechanism 70, disposed above the belt between the main drum and the tensioning drum, comprises: four groove-shaped photoelectric switches 71 and a photoelectric switch support bracket 72.

The opto-electronic switch support bracket 72 has a U-shaped slot for receiving the slotted opto-electronic switch 71. The optoelectronic switch support bracket 72 has four openings at the top.

In the present embodiment, the four groove-type photoelectric switches 71 have the same structure but different functions. Each of the groove-type photoelectric switches 71 includes a photoelectric box 711, a photoelectric box hanger plate 712, and a photoelectric box hanger 713.

The photoelectric box 711 includes a left side arm 711a, a right side arm 711b, and a suspension arm 711 c.

The left arm 711a is provided with a light emitter, which is an infrared emitter in this embodiment. The right arm 711b is provided with a light receptor, which in this embodiment is an infrared receiving tube for receiving light emitted from the infrared emitting tube. The side of the right arm 711b to which the infrared receiver tube is attached is disposed opposite to the side of the left arm 711a to which the infrared emitter tube is attached. Boom 711c is used to connect left side arm 711a and right side arm 711b to form a U-shaped slot through which belt 30 passes.

A photovoltaic box hanger plate 712 is mounted on top of the photovoltaic box 711. The photoelectric box suspension bar 713 is inserted into an opening at the top of the photoelectric switch support frame 72 and is screwed with the photoelectric switch support frame 72. The bottom of the photovoltaic box hanger 713 is fixedly connected to the photovoltaic box hanger plate 712. The user can adjust the height of the photovoltaic box 711 by adjusting the photovoltaic box hanger 713.

The four groove-shaped photoelectric switches 71 have different heights from the upper edge of the abrasive belt 30. In the present embodiment, hereinafter, for convenience of description, the four groove-type photoelectric switches 71 are referred to as a first photoelectric switch 71a, a second photoelectric switch 71b, a third photoelectric switch 71c, and a fourth photoelectric switch 71d, respectively. The detection positions of the first photoelectric switch 71a, the second photoelectric switch 71b, the third photoelectric switch 71c, and the fourth photoelectric switch 71d correspond to the respective offset positions. Specifically, when the first photoelectric switch 71a detects that the upward deviation position of the abrasive belt 30 is equal to or higher than the upper limit alarm position, a stop signal is issued to the control unit. When the second photoelectric switch 71b detects that the offset position of the abrasive belt 30 is higher than the downstream return position, a downstream signal is sent to the control unit. When the third opto-electronic switch 71c detects that the offset position of the abrasive belt 30 is below the up-going return position, an up-going signal is sent to the control unit. When the fourth photoelectric switch 71d detects that the downward offset position of the abrasive belt 30 is lower than or equal to the lower limit alarm position, a stop signal is sent to the control unit.

As shown in fig. 2, belt guard 3 is fixedly mounted on the frame and arranged at the bottom of belt 30 between main drum 10 and tensioning drum 20.

As shown in fig. 12, belt protection 3 comprises a mounting mechanism 80 and a sensing mechanism 90.

The mounting mechanism 80 is disposed on the frame and includes a first mounting seat 81, a second mounting seat 82, a rotating shaft 83, a damper 84, and a limiting member 85.

The cross section of the first mounting seat 81 is U-shaped, the opening direction of the U-shape faces the horizontal direction, first mounting holes are arranged at the positions of the two side plates of the U-shape close to the end part of one side of the first mounting seat 81 for mounting the rotating shaft 83, and the distance between the inner walls of the two side plates is h 1. A first limiting hole is formed near the first mounting hole, and the first limiting hole is located between the first mounting hole and the other end of the first mounting seat 81 and used for mounting a limiting member 85. The bottom of the first mount 81 is connected to the frame by a damper 84.

The cross section of the second mounting seat 82 is U-shaped, the opening direction of the U-shape faces the horizontal direction, the two side plates of the U-shape are respectively provided with a second mounting hole at the position close to the end part of one side of the second mounting seat 82, the two side plates are rotatably connected to the first mounting seat 81 through a rotating shaft 83, the rotating shaft 83 extends along the vertical direction, that is, the second mounting seat 82 can rotate in the horizontal plane around the rotating shaft 83. The distance between the outer walls of the two U-shaped side plates is h2, h2 is not less than h1, in the embodiment, h2 is h1, so that the second mounting seat 82 can be embedded into the U-shaped groove of the first mounting seat in the rotating process. A second limiting hole is arranged near the second mounting hole and is positioned between the first mounting hole and the other two side end parts of the second mounting seat 82.

The limiting member 85 is inserted into the first limiting hole and the second limiting hole along the vertical direction, and is used for limiting the second installation seat 82, so that an included angle between the second installation seat 82 and the first installation seat 81 is an acute angle. Second mounting seat 82 of the buckle is restrained by a restraining member 85 to extend toward the direction close to sanding belt 30.

The sensing mechanism 90 is mounted to the mounting mechanism 80 and includes a sensing switch and a trigger. In this embodiment, the inductive switch is a microswitch 91 and the trigger is a touch lever 92.

The control module 4 is communicated with the main power supply 5, and the microswitch 91 is connected in series in a circuit connecting the control module 4 and the main power supply 5 and is used for controlling the on-off of the circuit. In this embodiment, the control module 4 is a PLC control system.

The microswitch 91 is fixedly mounted on the U-shaped bottom surface of the mounting seat 82, and has a normally closed end 911, a normally open end 912, a common end 913, a contact 914 and an action spring 915. In this embodiment, the microswitch 91 is connected to the control module 4 and the circuit of the mains connection via the normally closed terminal 911 and the common terminal 913. The normally open end 912 is floating and not connected to any circuit.

Contact 914 is located at the top of microswitch 91, near belt 30, for controlling the on/off of the microswitch. When the contact 91 is not pressed down, the microswitch is closed to conduct the circuit; when the contact 91 is pressed down, the microswitch is turned off, and the circuit is turned off to stop the control module 4, because the control module 4 controls the rice milling device 1 to mill rice, after the circuit is turned off, the rice milling device 1 does not mill rice any more, that is, the main roller 10 and the abrasive belt 30 stop operating, so that the abrasive belt 30 does not slide down any more.

The actuating spring 914 is L-shaped, and has one end fixedly connected to the housing of the micro switch 91 and the other end extending above the contact 914, and is elastic. Once a downward force is applied to action spring 914 above the end of action spring 914 near contact 914, action spring 914 presses contact 914 downward, thereby disconnecting control module 4 from mains power supply 5.

One end of the touch lever 92 is a fixed end 921 and the other end is a free end 922. The fixed end 921 is rotatably mounted on the U-shaped bottom surface of the second mounting seat 82, that is, the touch lever 92 can rotate in a horizontal plane. Free end 912 extends from second mount 82 and extends to the bottom of abrasive belt 30. In the initial state, the touch lever 92 extends in the horizontal direction, and tends to rotate downward.

One end of the operation spring 915 close to the contact 914 abuts against the touch lever 92, and limits the touch lever 92 to prevent the touch lever 92 from rotating downward, and the point of contact between the two is located at the middle position of the touch lever 92.

The height position of touch lever 92 in the vertical direction corresponds to the dangerous position of sanding belt 30. The hazardous position of sanding belt 30 means that sanding belt 30 will come into contact with other hard objects in the grinding apparatus at the bottom of the sanding belt when the height of the bottom edge of sanding belt 30 in the vertical direction is lower than the height of the hazardous position, i.e. the height of the hazardous position is lower than the height of the bottom edge of sanding belt 30 in normal operation and higher than the height of other hard objects at the bottom of sanding belt 30 in the grinding apparatus. Once sanding belt 30 slides down so that the height of the bottom edge of sanding belt 30 is lower than the height of the dangerous position, sanding belt 30 presses down on free end 921 of touch lever 92, which in turn allows touch lever 92 to press down on action spring 915 so that action spring 915 presses down contact 914, turning off microswitch 91.

An emergency stop switch is arranged in a circuit of the control module 4 communicated with the main power supply 5 and is used for manually controlling the on-off of the circuit where the control module is located when an emergency occurs.

The working principle of the deviation adjusting mechanism of the abrasive belt deviation adjusting device provided by the embodiment is as follows:

when the first photoelectric switch 71a detects that the upward deviation amount of the abrasive belt 30 is greater than or equal to the upper limit alarm value, a stop signal is sent to the control unit. When the fourth photoelectric switch 71d detects that the downward deviation amount of the abrasive belt 30 is greater than or equal to the lower limit alarm value, a stop signal is sent to the control unit. When the control unit receives the stop signal, the control unit controls the driving member of the main roller 10 to stop running through the electromagnetic valve.

When the second photoelectric switch 71b detects that the upward offset of the abrasive belt 30 is greater than the downward return value, it sends a downward signal to the control unit. When the third opto-electronic switch 71c detects that the amount of downward displacement of the abrasive belt 30 is larger than the up-return value, an up-signal is sent to the control unit.

When the control unit receives the uplink signal or the downlink signal, the control unit controls the offset driving member 48 through the electromagnetic valve to drive the first oscillating bar 44 to move around the offset rotating shaft 42, so as to drive the second oscillating bar 47 to swing, and the second oscillating bar 47 drives the tensioning roller 20 and the second oscillating bar 47 to swing synchronously through the offset rotating shaft, so that the axis of the tensioning roller 20 and the axis of the main roller 10 form a certain included angle. The deflection of the sanding belt 30 is achieved when the axis of the tensioning roller 20 is at an angle to the axis of the main roller 10. Taking fig. 2 as an example, when the sanding belt rotates clockwise, the downward deviation of sanding belt 30 can be realized by controlling tensioning roller 20 to swing upward in the figure, and the upward deviation of sanding belt 30 can be realized by controlling tensioning roller 20 to swing downward in the figure. And vice versa.

Once channel-type photoelectric switch 71 is disabled, when abrasive belt 30 continues to slide down during operation, deviation-adjusting mechanism 40 cannot adjust the position of abrasive belt 30 any more, and abrasive belt 30 is protected by abrasive belt protection device 3 and is controlled to stop when abrasive belt 30 slides down to a position where the bottom edge of abrasive belt 30 is lower than the dangerous position.

The working principle of the belt protection 3 according to the present embodiment for protecting the abrasive belt 30 is as follows:

in the initial state, the height of the bottom edge of the abrasive belt 30 is higher than the height of the dangerous position, the contact 914 of the micro switch 91 is not pressed, and at this time, the micro switch is in a closed state, so that the circuit where the control module 4 is located is conducted.

When sanding belt 30 slides down to a height where the bottom edge thereof is lower than the dangerous position, sanding belt 30 contacts free end 922 of touch lever 92 and presses touch lever 92 downward, causing touch lever 92 to rotate downward about fixed end 921 thereof, pressing action spring 915 causes action spring to press contact 914 downward.

When the contact 914 is pressed, the microswitch 91 is turned off, so that the circuit of the control module 4 is opened, and the rice milling device 1 which is controlled by the control module 4 to operate stops, that is, the main roller 10 stops rotating, so that the abrasive belt 30 stops operating, and the abrasive belt 30 stops sliding downward under the tensioning action of the tensioning roller 20.

Examples effects and effects

The abrasive belt protection device provided by the embodiment is provided with a sensing mechanism for controlling the on-off of a circuit of a control module communicated with a main power supply, wherein the sensing mechanism is provided with a sensing switch and a trigger part matched with the sensing switch, the free end of the trigger part extends to the bottom of an abrasive belt, and when the abrasive belt slides downwards in the operation process until the bottom edge of the abrasive belt is lower than a dangerous position, the trigger part is triggered and the sensing switch is disconnected, so that the control module is disconnected with the main power supply, the rice milling device stops working, and the abrasive belt stops working. Under the tensioning action of the tensioning roller, the abrasive belt does not slide down any more, so that the abrasive belt is prevented from sliding down to cut other parts and being torn after touching hard objects.

In addition, the rice milling device stops working after the induction switch is disconnected, which is equivalent to emergency stop of milling equipment in emergency, so that the rice milling device is convenient for workers to maintain, the abrasive belt is lifted, components such as a groove type photoelectric switch and the like are overhauled, and compared with the method that the abrasive belt is torn after sliding down to touch a hard object and then is replaced, the time is saved, and the production efficiency is improved.

In addition, the induction switch is connected in series to a circuit where the control module is located through the normally closed end and the public end, the trigger piece is a touch rod, the whole milling equipment does not need to be changed, the protection of the abrasive belt can be realized only by arranging the induction mechanism in the embodiment at the bottom of the milling equipment, the structure is simple, and the cost is low.

In addition, in this embodiment, the sensing mechanism is installed on the installation mechanism, the installation mechanism includes a first installation base connected to the frame and a second installation base capable of rotating around the first installation base, the second installation base is kept fixed through the relative position of the limiting part and the first installation base, so that in the normal working process of the grinding equipment, the position of the sensing mechanism is kept fixed, and when the abrasive belt protection device needs to be overhauled or adjusted, the limiting part can be pulled out to rotate the second installation base so that the touch rod is moved away from the bottom of the abrasive belt, and the abrasive belt is convenient to move up and down.

In addition, in this embodiment, first mount pad passes through the attenuator to be connected in the frame, because milling equipment probably produces at the in-process of husk rice and rocks, the setting of attenuator can alleviate first mount pad, connect the second mount pad on first mount pad and install the range of rocking of induction mechanism on the second mount pad, and then guarantees the accuracy of touching the pole position.

The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.

Claims

1. A belt protection device installed in a grinding apparatus having a mains power supply, a vertically arranged main drum, a vertically arranged tensioning drum, a belt arranged outside the main drum and the tensioning drum, and a control module electrically connected to the mains power supply for controlling the rotation of the main drum, characterized by comprising:

the induction mechanism is arranged at the bottom of the abrasive belt and is positioned between the main roller and the tensioning roller,

wherein the induction mechanism is provided with a trigger piece and an induction switch matched with the trigger piece,

the position of the triggering element in the vertical direction corresponds to the danger position of the bottom edge of the sanding belt,

the inductive switch is connected with the main power supply and the control module in series, and when the abrasive belt moves downwards to a position where the height of the bottom edge of the abrasive belt is lower than that of the dangerous position, the trigger piece is triggered to disconnect the inductive switch, and further the control module is disconnected with the main power supply.

2. Abrasive belt protection arrangement according to claim 1, characterized in that it further comprises:

a mounting mechanism for mounting the sensing mechanism,

the triggering piece is a touch rod, one end of the touch rod is a fixed end, the other end of the touch rod is a free end, the fixed end is arranged in the mounting mechanism and can rotate in a vertical plane, the free end extends to the lower part of the sand belt,

the inductive switch is a microswitch which is fixedly arranged in the mounting mechanism, is positioned at the bottom of the touch rod, is connected in series in a circuit connected with the main power supply and the control module through a normally closed end and a public end of the microswitch, and is provided with a contact which faces the touch rod and is matched with the touch rod, and the microswitch is disconnected when the contact is pressed down.

3. Abrasive belt protection arrangement according to claim 2, characterized in that:

wherein the micro switch is also provided with an action reed corresponding to the contact,

one end of the action reed is fixedly connected to the shell of the micro switch, and the other end of the action reed is positioned between the touch rod and the contact and is abutted against the touch rod.

4. Abrasive belt protection arrangement according to claim 2, characterized in that:

wherein the fixed end of the touch bar is located at an outer side of the abrasive belt.

5. Abrasive belt protection arrangement according to claim 2, characterized in that:

wherein the milling device has a machine frame,

the mounting mechanism is arranged on the frame and is provided with a first mounting seat and a second mounting seat,

the first mounting seat is fixedly arranged on the frame,

the second installation seat is rotatably installed on the first installation seat, and the touch rod and the induction switch are installed on the second installation seat.

6. Abrasive belt protection arrangement according to claim 5, characterized in that:

wherein the mounting mechanism is also provided with a limiting piece,

the first mounting seat and the second mounting seat are respectively provided with a first limiting hole and a second limiting hole at corresponding positions, and the limiting piece is inserted into the first limiting hole and the second limiting hole and used for limiting the second mounting seat.

7. Abrasive belt protection arrangement according to claim 5, characterized in that:

wherein, the installation mechanism passes through the attenuator with frame fixed connection.

8. A milling apparatus, comprising:

a main power supply, a vertically arranged main roller, a vertically arranged tensioning roller, an abrasive belt arranged at the outer sides of the main roller and the tensioning roller, a control module electrically connected with the main power supply and used for controlling the rotation of the main roller, and an abrasive belt protection device,

wherein the belt protection is in accordance with any one of claims 1-7.