Belt guards and grinding equipment

Abstract

The present invention provides a sanding belt protection device and a grinding device, belonging to the field of grinding devices. The sanding belt protection device provided by the present invention comprises: a sensing mechanism installed at the bottom of the sanding belt and located between the main roller and the tensioning roller, wherein the sensing mechanism has a trigger and a sensing switch matched with the trigger, the position of the trigger in the vertical direction corresponds to the dangerous position of the bottom edge of the sanding belt, the sensing switch is connected in series with the main power supply and the control module, and when the sanding belt moves downward to the height of the bottom edge of the sanding belt lower than the height of the dangerous position, the trigger sensing member causes the sensing switch to be disconnected, and further causes the control module to be disconnected from the main power supply.

Description

Technical Field

[0001] The invention relates to a grinding device, in particular to an abrasive belt protection device and a grinding device. Background Art

[0002] Milling equipment is a kind of equipment used to grind large particles into small particles. For example, rice milling machine is a common milling equipment, which is used to peel brown rice into polished rice.

[0003] Conventional rice milling machines usually use the extrusion principle, which can easily cause rice grains to break. In order to reduce the phenomenon of rice grain breakage, some devices that use abrasive belt grinding to peel the rice grains have appeared in the prior art. The grinding equipment using abrasive belts includes a frame, a feeding device, a discharging device, a main drum, an abrasive belt mounted on the main drum, and a whitening chamber surrounding the main drum. In the above-mentioned rice milling machine, since the drum is arranged vertically, the abrasive belt will be affected by gravity and will inevitably slide downward. If there is no interference, the moving abrasive belt may cut other parts. In serious cases, the abrasive belt may also tear after touching a hard object during the sliding process. This will not only easily cause damage to the equipment, but also affect production efficiency. Summary of the invention

[0004] In order to solve the above problems, a sand belt protection device and a grinding device including the sand belt protection device are provided to prevent the sand belt from continuously sliding down and causing the sand belt to tear itself and cut other parts. The present invention adopts the following technical solutions:

[0005] The present invention provides a sanding belt protection device, which is installed in a grinding device. The grinding device has a main power supply, a vertically arranged main roller, a vertically arranged tensioning roller, a sanding belt arranged on the outside of the main roller and the tensioning roller, and a control module electrically connected to the main power supply for controlling the rotation of the main roller. The device is characterized in that it includes: a sensing mechanism installed at the bottom of the sanding belt and located between the main roller and the tensioning roller, wherein the sensing mechanism has a triggering member and a sensing switch matched with the triggering member, the position of the triggering member in the vertical direction corresponds to the dangerous position of the bottom edge of the sanding belt, the sensing switch is connected in series with the main power supply and the control module, and when the sanding belt moves downward to a height of the bottom edge of the sanding belt that is lower than the height of the dangerous position, the sensing member is triggered to disconnect the sensing switch, thereby further disconnecting the control module from the main power supply.

[0006] The sanding belt protection device provided by the present invention may also have the following features, and further include: a mounting mechanism for mounting the sensing mechanism, the triggering member being a touch rod, one end of the touch rod being a fixed end, and the other end being a free end, the fixed end being mounted in the mounting mechanism and being rotatable in a vertical plane, the free end extending to below the sanding belt, the sensing switch being a micro switch, the micro switch being fixedly mounted in the mounting mechanism, being located at the bottom of the touch rod, being connected in series in a circuit connected to a main power supply and a control module through its normally closed end and a common end, and having a contact facing the touch rod and cooperating with the touch rod, and the micro switch being disconnected when one of the contacts is pressed.

[0007] The sanding belt protection device provided by the present invention may also have such a feature, wherein the micro switch also has an action reed corresponding to the contact, one end of the action reed is fixedly connected to the housing of the micro switch, and the other end is located between the touch rod and the contact and abuts against the touch rod.

[0008] The sanding belt protection device provided by the present invention may also have such a feature, wherein the fixed end of the touch rod is located outside the sanding belt.

[0009] The sanding belt protection device provided by the present invention may also have such a feature, wherein the grinding equipment has a frame, the mounting mechanism is installed on the frame, has a first mounting seat and a second mounting seat, the first mounting seat is fixedly mounted on the frame, the second mounting seat is rotatably mounted on the first mounting seat, and the touch rod and the induction switch are installed on the second mounting seat.

[0010] The sanding belt protection device provided by the present invention may also have such a feature, wherein the mounting mechanism also has a limiting member, and the first limiting hole and the second limiting hole are respectively provided at corresponding positions of the first mounting seat and the second mounting seat, and the limiting member is inserted into the first limiting hole and the second limiting hole to limit the second mounting seat.

[0011] The sanding belt protection device provided by the present invention may also have the following feature: the mounting mechanism is fixedly connected to the frame via a damping member.

[0012] The present invention provides a grinding device, characterized in that it comprises: a main power supply, a vertically arranged main drum, a vertically arranged tensioning drum, an abrasive belt arranged outside the main drum and the tensioning drum, a control module electrically connected to the main power supply and used for controlling the rotation of the main drum, and an abrasive belt protection device.

[0013] Wherein, the sanding belt protection device is any one of the sanding belt protection devices mentioned above.

[0014] Function and Effect of the Invention

[0015] According to the sanding belt protection device of the present invention, there is a sensing mechanism for controlling the on / off of the circuit connecting the control module and the main power supply. The sensing mechanism has a sensing switch and a trigger member matched with the sensing switch. The free end of the trigger member extends to the bottom of the sanding belt. When the sanding belt slides downward to a point where its bottom edge is lower than the dangerous position during operation, the trigger member is triggered and the sensing switch is disconnected, so that the control module is disconnected from the main power supply, thereby stopping the rice milling device, that is, stopping the sanding belt. Under the tensioning action of the tensioning roller, the sanding belt no longer slides down, thereby preventing the sanding belt from sliding down and cutting other parts, and preventing the sanding belt from sliding down and touching hard objects and tearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a grinding device in an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the installation of a detection mechanism and a protective device in a grinding device in an embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the main drum, the tensioning drum and the abrasive belt in an embodiment of the present invention;

[0019] Figure 4 is a side view of the deflection adjustment structure in the sand belt deflection adjustment device in an embodiment of the present invention;

[0020] Figure 5 is a top view of the deflection adjustment structure in the sand belt deflection adjustment device in an embodiment of the present invention;

[0021] Figure 6 is a side view of a tensioning mechanism in the abrasive belt deflection adjustment device in an embodiment of the present invention;

[0022] Figure 7 is a top view of a tensioning mechanism in a sand belt deflection adjustment device according to an embodiment of the present invention;

[0023] Figure 8 is a top view of a speed regulating mechanism in a sand belt deflection regulating device according to an embodiment of the present invention;

[0024] Fig. 9 is a side view of a speed regulating mechanism in the sand belt deflection regulating device in an embodiment of the present invention;

[0025] Fig.10 1 is a schematic diagram of a detection mechanism in a belt deflection adjustment device according to an embodiment of the present invention;

[0026] Fig.11 is a schematic diagram of the structure of a photoelectric switch in the sand belt deflection adjustment device in an embodiment of the present invention; and

[0027] Fig.12Schematic diagram of the structure of the sand belt protection device in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described below with reference to the accompanying drawings and embodiments.

[0029] <Example>

[0030] Figure 1 Schematic diagram of the structure of the grinding equipment in the embodiment of the present invention. Figure 2 It is a schematic diagram of the installation of the detection mechanism and the protection device in the grinding equipment in the embodiment of the present invention. Figure 3 It is a schematic diagram of the structure of the main drum, the tensioning drum and the abrasive belt in an embodiment of the present invention.

[0031] This embodiment provides a milling device, including a rice milling device 1, a sand belt deviation adjustment device 2, a sand belt protection device 3, and a control module 4 ( Figures 1 to 3 ), a rack (not shown in the figure).

[0032] The control module 4 is used to control the rice milling device 1 and the sand belt deviation adjustment device 2 to operate.

[0033] like Figure 1-3 As shown, the rice milling device 1 includes a main drum 10 , a tensioning drum 20 , and an abrasive belt 30 .

[0034] 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 .

[0035] The cylinder 11 is cylindrical and extends in the vertical direction, with its end face parallel to the horizontal plane. The main roller shaft 12 is arranged at the axis of the cylinder and is used to be driven by the rotary drive mechanism to drive the cylinder 11 to rotate. The upper cover plate 13 is installed on Figure 2 The lower cover plate 14 is installed above the end surface of the middle cylinder 11. Figure 2 Below the end surface of the middle cylinder 11. The upper cover plate 13 and the lower cover plate 14 are rotatably connected relative to the cylinder 11 and the main roller shaft 12, that is, when the cylinder 11 and the main roller shaft 12 rotate, the upper cover plate 13 and the lower cover plate 14 will not rotate with them. The partition plate 15 is arranged between the main roller 10 and the tensioning roller 20, and the two ends are fixedly mounted on the upper cover plate 13 and the lower cover plate 14 respectively. The partition plate 15 is used to isolate the main roller 10 and the tensioning roller 20.

[0036] The tensioning roller 20 includes a tensioning cylinder 21 and a cover shell 22 .

[0037] The tensioning cylinder 21 is cylindrical, and its diameter is smaller than that of the cylinder 11, and its end face is parallel to the end face of the cylinder 11 of the main drum 10. The cover 22 is rotatably connected to the tensioning cylinder 21, that is, when the tensioning cylinder 21 rotates, the cover 22 will not rotate with it. The cover 22 forms a semi-enclosed structure for the tensioning cylinder 21. Specifically, the cover 22 covers part of the side of the tensioning cylinder 21, but the inner side of the cover 22 close to the tensioning cylinder 21 will not come into contact with the tensioning cylinder 21 when the tensioning cylinder 21 rotates. The specific area of ​​the tensioning cylinder 21 covered by the cover 22 can be set according to specific needs, so as not to reduce the contact area between the sanding belt 30 and the tensioning cylinder 21. In this embodiment, the cover 22 covers 50% of the side of the tensioning cylinder 21 close to the main drum 10.

[0038] The abrasive belt 30 is sleeved on the outer side of the cylinder body 11 of the main cylinder 10 and the tensioning cylinder body 21 of the tensioning cylinder 20 to form a complete abrasive roller structure.

[0039] The sanding belt deviation adjustment device 2 is used to adjust the position of the sanding belt 30 in the vertical direction, and comprises a deviation adjustment mechanism 40 , a tensioning mechanism 50 , a speed regulating mechanism 60 and a detection mechanism 70 .

[0040] Figure 4 It is a side view of the deflection adjustment structure in the sanding belt deflection adjustment device in an embodiment of the present invention. Figure 5 It is a top view of the deflection adjustment structure in the sanding belt deflection adjustment device in an embodiment of the present invention.

[0041] like Figure 4-5 As shown, the deflection adjustment mechanism 40 includes: a deflection adjustment base plate 41, a deflection adjustment shaft 42, a deflection adjustment shaft cover 43, a first swing rod 44, a deflection adjustment collision block 45, a deflection adjustment rotation block 46, a second swing rod 47 and a deflection adjustment driving member 48.

[0042] The deflection adjusting bottom plate 41 is arranged above the end surface of the main drum 10 and is arranged parallel to the end surface of the main drum 10. The deflection adjusting bottom plate 41 has a bar-shaped hole for the second swing rod 47 to pass through and swing. In other embodiments, the shape and size of the hole can be adaptively adjusted according to the actual swing range of the second swing rod 47.

[0043] The deflection adjustment shaft 42 is fixedly disposed on the upper surface of the deflection adjustment base plate 41 .

[0044] The deflection adjusting shaft cover 43 is disposed above the deflection adjusting shaft 42 to prevent foreign matter from entering the deflection adjusting shaft 42 so as to ensure the reliability of the deflection adjusting shaft 42 .

[0045] The first swing rod 44 is arranged parallel to the deflection adjustment base plate 41, and the first swing rod 44 is passed through the deflection adjustment shaft 42 so that the first swing rod 44 can rotate around the deflection adjustment shaft 42. The distance between the two ends of the first swing rod 44 and the deflection adjustment shaft 42 can be adjusted according to actual conditions. In this embodiment, the distance between the two ends of the first swing rod and the deflection adjustment shaft 42 is equal.

[0046] The deflection adjustment bump block 45 is disposed at one end of the first swing rod 44, and the bottom of the deflection adjustment bump block 45 does not contact the deflection adjustment bottom plate 41, so that the resistance received by the first swing rod 44 during rotation can be reduced. In this embodiment, the deflection adjustment bump block 45 has a large surface area, which facilitates the deflection adjustment driving member 48 to accurately push the deflection adjustment bump block 45 to rotate around the deflection adjustment shaft 42.

[0047] The deviation adjusting rotating block 46 is arranged at the other end away from the deviation adjusting collision block 45. In the present embodiment, the deviation adjusting rotating block 46 uses a deviation adjusting ball head component. According to the actual situation, a deviation adjusting ball head cover can be provided on the deviation adjusting ball head component to cover the deviation adjusting ball head component. The deviation adjusting ball head cover is used to prevent foreign matter from entering the deviation adjusting ball head component so as to ensure the reliability of the deviation adjusting ball head component.

[0048] The second swing rod 47 is arranged parallel to the tensioning roller 20. A hook is formed at one end of the second swing rod 47, and the hook is inserted into the bottom of the deflection adjustment rotating block 46, and the other end extends downward through the deflection adjustment bottom plate 41. A deflection adjustment rotating shaft 401 is arranged at the other end of the second swing rod 47, and the second swing rod 47 is connected to the housing 22 of the tensioning roller 20 through the deflection adjustment rotating shaft 401. When the second swing rod 47 swings, it drives the deflection adjustment rotating shaft 401 to rotate, thereby driving the tensioning roller 20 and the second swing rod 47 to swing synchronously. In this embodiment, a rotating bearing is provided on the outer sleeve of the deflection adjustment rotating shaft 401.

[0049] The deflection adjustment drive member 48 includes: a cylinder 481, a cylinder seat 482, a Y-type joint 483, a double-hole plate 484 and a deflection adjustment cylinder plate 485. The cylinder seat 482 is installed on the side of the deflection adjustment base plate 41 close to the deflection adjustment base plate 41 and is arranged perpendicular to the deflection adjustment base plate 41. The cylinder 481 is installed on the cylinder seat 482, and the cylinder rod is arranged toward the deflection adjustment base plate 41. The Y-type joint 483 is arranged at the end of the cylinder rod of the cylinder 481, and is connected to the top of the deflection adjustment bump block 45 through the double-hole plate 484. Through the above connection, when the cylinder 481 is running, the cylinder rod extends to push the Y-type joint forward toward the deflection adjustment bump block 45, and at the same time drives the deflection adjustment bump block 45 to rotate around the deflection adjustment shaft 42 through the double-hole plate 484. The deflection adjustment cylinder plate 485 is fixed on the deflection adjustment base plate 41, and is used to support the cylinder 481 and the cylinder seat 482.

[0050] Figure 6 It is a side view of the tensioning mechanism in the sand belt deflection adjustment device in the embodiment of the present invention. Figure 7It is a top view of the tensioning mechanism in the sand belt deflection adjustment device in the embodiment of the present invention.

[0051] like Figure 6-7 As shown, the tensioning mechanism 50 is used to tension the abrasive belt, and includes an upper tensioning assembly and a lower tensioning assembly, wherein the upper tensioning assembly includes an upper tensioning cylinder 51 , a tensioning base plate 52 , and a push plate 53 , and the lower tensioning assembly includes a lower tensioning cylinder 54 and a support frame 55 .

[0052] The tensioning base plate 52 is arranged below the deviation adjusting base plate 41 and is arranged parallel to the deviation adjusting base plate 41. A slide rail is arranged on the upper surface of the tensioning base plate 52, and the extension direction of the slide rail is parallel to the extension direction of the line connecting the axis of the main roller 10 and the axis of the tensioning roller 20. A slider matching the slide rail on the upper surface of the tensioning base plate 52 is arranged at the bottom of the deviation adjusting base plate 41, thereby realizing a slidable connection between the tensioning base plate and the deviation adjusting base plate. The tensioning base plate 52 and the upper cover plate 13 can be two independent plates or the same plate. In this embodiment, the tensioning base plate 52 and the upper cover plate 13 are two independent plates.

[0053] The upper tensioning cylinder 51 is mounted on the tensioning base plate 52. The push plate 53 is arranged on the deviation adjusting base plate 41, and when the cylinder rod of the upper tensioning cylinder 51 is extended, the push plate can be pushed, thereby driving the deviation adjusting base plate 41 to move along the slide rail.

[0054] The support frame 55 is L-shaped and is arranged at the bottom of the second swing rod 47. The lower tensioning cylinder 54 is installed on the support frame 55, and the cylinder rod of the lower tensioning cylinder 54 faces the main roller. When the lower tensioning cylinder 54 is running, its cylinder rod abuts against the partition 15. Since the partition 15 is fixed, a reaction force is generated on the cylinder rod, thereby driving the tensioning roller 20 away from the main roller 10.

[0055] Figure 8 It is a top view of the speed regulating mechanism in the sand belt deflection regulating device in the embodiment of the present invention. Fig. 9 It is a side view of the speed regulating mechanism in the sand belt deflection regulating device in the embodiment of the present invention.

[0056] The speed regulating mechanism 60 is used to limit the rotation range of the first swing rod so as to control the speed of the sand belt going up or down. The speed regulating mechanism 60 includes a pair of speed regulating parts, which are arranged on both sides of the deviation adjustment block 45 in a mirror-symmetrical manner with the first swing rod 44 as the symmetry axis.

[0057] Each speed regulating component includes: a backing plate 61 , a speed regulating sliding block 62 , a pressing block 63 and a speed regulating screw 64 .

[0058] The backing plate 61 is mounted on the deviation adjusting base plate 41 .

[0059] The speed regulating slider 62 is slidably disposed above the pad 61, and its side close to the first swing rod 44 has a certain angle with the first swing rod 44. In this embodiment, Figure 8 As shown, the width of the speed regulating slider 62 gradually decreases from left to right. The speed regulating slider 62 is used to limit the maximum swing amplitude of the first swing rod, thereby limiting the swing amplitude of the tensioning roller 20, and thus can be used to limit the up and down deflection speed of the abrasive belt 30. In other embodiments, the bevel of the speed regulating slider can also be designed to be stepped or wavy, or similar to this embodiment, it can be designed to be beveled, but its width gradually increases from left to right.

[0060] The speed regulating screw 64 is inserted into the speed regulating slider 62, and forms a common screw rod cooperation with the speed regulating slider 62, and is used to drive the speed regulating slider to move along the length direction of the speed regulating screw 64 when the speed regulating screw 64 rotates. In this embodiment, the speed regulating screw 64 has a knob at one end away from the speed regulating slider 62, and the knob is located outside the deviation adjustment bottom plate 41, so that it is convenient for users to use.

[0061] The pressure block 63 is installed on the backing plate 61, covering the top of the speed regulating slider 62, and is used to protect the speed regulating screw 64 and the screw structure formed by the speed regulating slider 62. In this embodiment, the pressure block close to the side of the deviation adjustment drive 48 and the deviation adjustment cylinder plate 485 are the same component. In other embodiments, the pressure block close to the side of the deviation adjustment drive and the deviation adjustment cylinder plate can be two independent components.

[0062] Fig.10 Schematic diagram of the detection mechanism in the sand belt deflection adjustment device in the embodiment of the present invention. Fig.11 It is a schematic diagram of the structure of the photoelectric switch in the sand belt deflection adjustment device in the embodiment of the present invention.

[0063] like Figure 10-11 As shown, the detection mechanism 70 is arranged above the abrasive belt between the main roller and the tensioning roller, and includes: four slot-type photoelectric switches 71 and a photoelectric switch support frame 72.

[0064] The photoelectric switch support frame 72 has a U-shaped groove, and the U-shaped groove is used to receive the groove-type photoelectric switch 71. The top of the photoelectric switch support frame 72 has four openings.

[0065] In this embodiment, the four slot-type photoelectric switches 71 have the same structure but different functions. Each slot-type photoelectric switch 71 includes a photoelectric box 711 , a photoelectric box hanging plate 712 and a photoelectric box hanging rod 713 .

[0066] The photoelectric box 711 includes a left arm 711 a , a right arm 711 b , and a suspension arm 711 c .

[0067] The left arm 711a is equipped with a light emitter, which is an infrared emitting tube in this embodiment. The right arm 711b is equipped with a light receiver, which is an infrared receiving tube in this embodiment for receiving light emitted by the infrared emitting tube. The side of the right arm 711b equipped with the infrared receiving tube is arranged opposite to the side of the left arm 711a equipped with the infrared emitting tube. The suspension arm 711c is used to connect the left arm 711a and the right arm 711b, thereby forming a U-shaped groove for the sanding belt 30 to pass through.

[0068] The photoelectric box hanging plate 712 is installed on the top of the photoelectric box 711. The photoelectric box hanging rod 713 is inserted into the opening on the top of the photoelectric switch support frame 72 and is threadedly connected to the photoelectric switch support frame 72. The bottom of the photoelectric box hanging rod 713 is fixedly connected to the photoelectric box hanging plate 712. The user can adjust the height of the photoelectric box 711 by adjusting the photoelectric box hanging rod 713.

[0069] The four slot-type photoelectric switches 71 are at different heights from the upper edge of the sanding belt 30. In this embodiment, for the convenience of description, the four slot-type photoelectric switches 71 are respectively referred to as the first photoelectric switch 71a, the second photoelectric switch 71b, the third photoelectric switch 71c and the fourth photoelectric switch 71d. 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 offset position of the sanding belt 30 is higher than or equal to the upper limit alarm position, a stop signal is sent to the control unit. When the second photoelectric switch 71b detects that the offset position of the sanding belt 30 is higher than the downward return position, a downward signal is sent to the control unit. When the third photoelectric switch 71c detects that the offset position of the sanding belt 30 is lower than the upward return position, an upward signal is sent to the control unit. When the fourth photoelectric switch 71d detects that the downward offset position of the sanding belt 30 is lower than or equal to the lower limit alarm position, a stop signal is sent to the control unit.

[0070] like Figure 2 As shown, the sanding belt protection device 3 is fixedly installed on the frame, arranged at the bottom of the sanding belt 30 , and located between the main roller 10 and the tensioning roller 20 .

[0071] Fig.12 Schematic diagram of the structure of the sand belt protection device in the embodiment of the present invention.

[0072] like Fig.12 As shown, the sanding belt protection device 3 includes a mounting mechanism 80 and a sensing mechanism 90 .

[0073] 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 .

[0074] The cross section of the first mounting seat 81 is U-shaped, and the opening direction of the U-shape faces the horizontal direction. The two side plates of the U-shape are provided with first mounting holes at positions near one end of the first mounting seat 81, for mounting the rotating shaft 83. The distance between the inner walls of the two side plates is h1. A first limiting hole is provided 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, for mounting a limiting member 85. The bottom of the first mounting seat 81 is connected to the frame through a damper 84.

[0075] The cross section of the second mounting seat 82 is U-shaped, and the opening direction of the U-shape faces the horizontal direction. The second mounting holes are respectively provided at the positions of the two side plates of the U-shape near the end of one side of the second mounting seat 82, and are rotatably connected to the first mounting seat 81 through the rotating shaft 83, and the rotating shaft 83 extends in the vertical direction, that is, the second mounting seat 82 can rotate around the rotating shaft 83 in the horizontal plane. The distance between the outer walls of the two side plates of the U-shape is h2, h2≤h1, and in this embodiment, h2=h1, so the second mounting seat 82 can be embedded in the U-shaped groove of the first mounting seat during the rotation process. A second limiting hole is provided near the second mounting hole, and the second limiting hole is located between the first mounting hole and the other two side ends of the second mounting seat 82.

[0076] The limiting member 85 is inserted into the first limiting hole and the second limiting hole in the vertical direction to limit the second mounting seat 82 so that the included angle between the second mounting seat 82 and the first mounting seat 81 is an acute angle. The second mounting seat 82 limited by the limiting member 85 extends toward the direction close to the abrasive belt 30.

[0077] The sensing mechanism 90 is mounted on the mounting mechanism 80 and includes a sensing switch and a trigger. In this embodiment, the sensing switch is a micro switch 91 and the trigger is a touch rod 92.

[0078] The control module 4 is connected to the main power supply 5, and the micro switch 91 is connected in series in the circuit connecting the control module 4 and the main power supply 5, and is used to control the on and off of the circuit. In this embodiment, the control module 4 is a PLC control system.

[0079] The micro switch 91 is fixedly mounted on the U-shaped bottom surface of the mounting base 82, and has a normally closed end 911, a normally open end 912, a common end 913, a contact 914, and an action reed 915. In this embodiment, the micro switch 91 is connected to the circuit connected to the control module 4 and the main power supply through the normally closed end 911 and the common end 913. The normally open end 912 is suspended and is not connected to any circuit.

[0080] The contact 914 is located at the top of the micro switch 91, close to the abrasive belt 30, and is used to control the on and off of the micro switch. When the contact 91 is not pressed, the micro switch is closed and the circuit is turned on; when the contact 91 is pressed, the micro switch is turned off, and then the circuit is turned off to stop the control module 4. Since the control module 4 controls the rice milling device 1 to mill rice, after the circuit is turned off, the rice milling device 1 no longer mills rice, that is, the main drum 10 and the abrasive belt 30 both stop moving, so that the abrasive belt 30 no longer slides down.

[0081] The action reed 914 is L-shaped, one end of which is fixedly connected to the housing of the micro switch 91, and the other end of which extends to the top of the contact 914 and is elastic. Once a downward force is applied to the action reed 914 above one end of the action reed 914 close to the contact 914, the action reed 914 presses the contact 914 downward, thereby disconnecting the control module 4 from the main power supply 5.

[0082] One end of the touch rod 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 rod 92 can rotate in a horizontal plane. The free end 912 extends from the second mounting seat 82 and extends to the bottom of the sanding belt 30. In the initial state, the touch rod 92 extends in the horizontal direction and has a tendency to rotate downward.

[0083] One end of the action reed 915 close to the contact point 914 abuts against the touch rod 92 to limit the touch rod 92 so as to prevent the touch rod 92 from rotating downward. The contact point between the two is located in the middle of the touch rod 92.

[0084] The height position of the touch rod 92 in the vertical direction corresponds to the dangerous position of the sand belt 30. The dangerous position of the sand belt 30 means that when the height of the bottom edge of the sand belt 30 in the vertical direction is lower than the height of the dangerous position, the sand belt 30 will contact other hard objects located at the bottom of the sand belt in the grinding equipment, that is, the height of the dangerous position is lower than the height of the bottom edge of the sand belt 30 when the sand belt 30 is working normally, and higher than the height of other hard objects at the bottom of the sand belt 30 in the grinding equipment. Once the sand belt 30 slides downward so that the height of the bottom edge of the sand belt 30 is lower than the height of the dangerous position, the sand belt 30 presses the free end 921 of the touch rod 92 downward, and then the touch rod 92 presses the action reed 915 downward, so that the action reed 915 presses the contact 914 to disconnect the micro switch 91.

[0085] An emergency stop switch is provided in the circuit connecting the control module 4 and the main power supply 5, for manually controlling the on and off of the circuit where the control module is located when an emergency occurs.

[0086] The working principle of the deflection adjustment mechanism of the sand belt deflection adjustment device provided in this embodiment is as follows:

[0087] When the first photoelectric switch 71a detects that the upward deflection 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 deflection 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. After receiving the stop signal, the control unit controls the driving element of the main drum 10 to stop running through the solenoid valve.

[0088] When the second photoelectric switch 71b detects that the upward displacement of the abrasive belt 30 is greater than the downward return value, a downward signal is sent to the control unit. When the third photoelectric switch 71c detects that the downward displacement of the abrasive belt 30 is greater than the upward return value, an upward signal is sent to the control unit.

[0089] When the control unit receives an up signal or a down signal, it controls the deflection adjustment drive 48 through the electromagnetic valve to drive the first swing rod 44 to move around the deflection adjustment shaft 42, thereby driving the second swing rod 47 to swing. The second swing rod 47 drives the tensioning roller 20 to swing synchronously with the second swing rod 47 through the deflection adjustment rotation axis, so that the axis of the tensioning roller 20 and the axis of the main roller 10 have a certain angle. When the axis of the tensioning roller 20 and the axis of the main roller 10 have a certain angle, the deviation of the sanding belt 30 can be adjusted. Figure 2 For example, when the abrasive belt rotates clockwise, the abrasive belt 30 can be deflected downwards by controlling the tensioning roller 20 to swing upwards in the figure, and the abrasive belt 30 can be deflected upwards by controlling the tensioning roller 20 to swing downwards in the figure. Vice versa.

[0090] Once the slot-type photoelectric switch 71 fails, when the sanding belt 30 continues to slide down during operation, the deviation adjustment mechanism 40 can no longer adjust the position of the sanding belt 30. At this time, the sanding belt 30 is protected by the sanding belt protection device 3, and when the sanding belt 30 slides down to its bottom edge below the dangerous position, the sanding belt is controlled to stop working.

[0091] The working principle of the sand belt protection device 3 provided in this embodiment for protecting the sand belt 30 is as follows:

[0092] In the initial state, the height of the bottom edge of the sanding belt 30 is higher than the height of the dangerous position, and the contact 914 of the micro switch 91 is not pressed. At this time, the micro switch is in a closed state, and the circuit where the control module 4 is located is turned on.

[0093] When the sanding belt 30 slides downward to a height where the bottom edge thereof is lower than the height of the dangerous position, the sanding belt 30 contacts the free end 922 of the touch rod 92 and presses the touch rod 92 downward, causing the touch rod 92 to rotate downward around its fixed end 921, pressing the action spring 915 so that the action spring presses the contact point 914 downward.

[0094] When the contact 914 is pressed, the micro switch 91 is disconnected, thereby disconnecting the circuit of the control module 4, and the rice milling device 1 operating under the control of the control module 4 also stops operating, that is, the main drum 10 stops rotating, thereby stopping the sanding belt 30 from running, and under the tensioning action of the tensioning drum 20, the sanding belt 30 stops sliding downward.

[0095] Example Function and Effect

[0096] The sanding belt protection device provided in this embodiment is provided with a sensing mechanism for controlling the on / off of the circuit connecting the control module and the main power supply. The sensing mechanism has a sensing switch and a trigger member matched with the sensing switch. The free end of the trigger member extends to the bottom of the sanding belt. When the sanding belt slides downward to a point where its bottom edge is lower than the dangerous position during operation, the trigger member is triggered and the sensing switch is disconnected, so that the control module is disconnected from the main power supply, thereby stopping the rice milling device, that is, stopping the sanding belt. Under the tensioning action of the tensioning roller, the sanding belt no longer slides down, thereby preventing the sanding belt from sliding down and cutting other parts, and preventing the sanding belt from tearing after touching hard objects.

[0097] In addition, the rice milling device stops working after the induction switch is disconnected, which is equivalent to an emergency stop of the milling equipment in an emergency situation, making it convenient for workers to carry out maintenance, lift the sanding belt and inspect components such as the grooved photoelectric switch. Compared with the replacement and inspection of the sanding belt that needs to be replaced after the sanding belt slides down and touches a hard object and is torn, it saves time and improves production efficiency.

[0098] In addition, the induction switch in this example is connected in series to the circuit where the control module is located through the normally closed end and the common end. The triggering member is a touch rod. There is no need to change the overall grinding equipment. Only the induction mechanism in this embodiment needs to be set at the bottom of the grinding equipment to protect the sanding belt. The structure is simple and the cost is low.

[0099] In addition, in this embodiment, the sensing mechanism is installed on the mounting mechanism, and the mounting mechanism includes a first mounting seat connected to the frame and a second mounting seat that can rotate around the first mounting seat. The second mounting seat is kept fixed in relative position to the first mounting seat by a limit member, so that during the normal operation of the grinding equipment, the position of the sensing mechanism remains fixed. When the sanding belt protection device needs to be inspected or adjusted, the limit member can be pulled out to rotate the second mounting seat so that the touch rod is moved away from the bottom of the sanding belt, thereby facilitating the up and down movement of the sanding belt.

[0100] In addition, in this embodiment, the first mounting seat is connected to the frame through a damper. Since the milling equipment may shake during the rice milling process, the setting of the damper can reduce the shaking amplitude of the first mounting seat, the second mounting seat connected to the first mounting seat, and the sensing mechanism installed on the second mounting seat, thereby ensuring the accuracy of the touch rod position.

[0101] The above embodiments are only used to illustrate specific implementation modes of the present invention, and the present invention is not limited to the description scope of the above embodiments.

Claims

1. A grinding device, comprising a frame, a main power supply, a vertically arranged main drum, a vertically arranged tensioning drum, an abrasive belt arranged outside the main drum and the tensioning drum, and a control module electrically connected to the main power supply for controlling the rotation of the main drum, characterized in that: include: Sanding belt protection device and sanding belt deflection adjustment device, Wherein, the sand belt protection device comprises: A sensing mechanism is installed at the bottom of the abrasive belt and is located between the main roller and the tensioning roller; and A mounting mechanism, used for mounting the sensing mechanism, The induction mechanism comprises a trigger and an induction switch matched with the trigger. The vertical position of the trigger element corresponds to the dangerous position of the bottom edge of the sanding belt. The induction switch is connected in series with the main power supply and the control module. When the sanding belt moves downward to a height where the bottom edge of the sanding belt is lower than the height of the dangerous position, the triggering member is triggered to disconnect the induction switch, further disconnecting the control module from the main power supply. The trigger member is a touch rod, one end of which is a fixed end and the other end is a free end. The fixed end is installed in the installation mechanism and can rotate in a vertical plane. The free end extends below the bottom edge of the sanding belt. The induction switch is a micro switch, which is fixedly installed in the installation mechanism and located at the bottom of the touch rod. It is connected in series in the circuit connecting the main power supply and the control module through its normally closed end and common end, and has a contact facing the touch rod and cooperating with the touch rod. Once the contact is pressed, the micro switch is disconnected. The mounting mechanism comprises a first mounting seat and a second mounting seat, The first mounting seat is fixedly mounted on the frame, The second mounting seat is rotatably mounted on the first mounting seat, and the touch rod and the induction switch are mounted on the second mounting seat. By rotating the second mounting seat, the touch rod can be moved away from the bottom of the sanding belt. The sand belt deflection adjustment device includes a detection mechanism, a deflection adjustment mechanism, and a speed adjustment mechanism. The detection mechanism is arranged above the abrasive belt between the main roller and the tensioning roller, and includes a plurality of photoelectric switches for detecting the offset of the abrasive belt. The deviation adjustment mechanism comprises: A deflection adjusting bottom plate is arranged above the end surface of the main roller and is parallel to the end surface; A deflection adjustment shaft is fixed on the upper surface of the deflection adjustment base plate; A first swing rod is arranged parallel to the deflection adjusting bottom plate and penetrates the deflection adjusting shaft; A deflection adjustment block is arranged at one end of the first swing rod; A deflection adjusting rotating block is arranged at the other end of the first swing rod; A second swing rod is arranged parallel to the tensioning roller, one end of which is passed through the bottom of the deviation adjustment rotating block, and the other end of which passes through the deviation adjustment bottom plate and extends downward and is connected to the cover of the tensioning roller through the deviation adjustment rotating shaft; and The deflection adjustment driving member is used to push the deflection adjustment collision block under the control of the control module, so as to drive the first swing arm to rotate around the deflection adjustment axis. The speed regulating mechanism comprises a pair of speed regulating members, which are arranged on both sides of the deflection regulating collision block in a mirror-image manner with the first swing rod as the symmetry axis. Each of the speed regulating components includes A speed regulating slider, wherein a side edge of the speed regulating slider close to the first swing rod forms an angle with the first swing rod; and The speed regulating screw rod cooperates with the speed regulating slider to form a screw rod and is used to drive the speed regulating slider to move along the length direction of the speed regulating screw rod.

2. The grinding device according to claim 1, characterized in that: in, The micro switch also has an action reed corresponding to the contact point. One end of the action reed is fixedly connected to the housing of the micro switch, and the other end is located between the touch rod and the contact point and abuts against the touch rod.

3. The grinding device according to claim 1, characterized in that: in, The fixed end of the touch rod is located outside the abrasive belt.

4. The grinding device according to claim 1, characterized in that: in, The installation mechanism also has a limiting member. A first limiting hole and a second limiting hole are respectively provided at corresponding positions of the first mounting seat and the second mounting seat, and the limiting member is inserted into the first limiting hole and the second limiting hole to limit the second mounting seat.

5. The grinding device according to claim 1, characterized in that: in, The mounting mechanism is fixedly connected to the frame via a damper.

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