Safety guard for three-side trimming machine

Abstract

The utility model belongs to the technical field of book cutting machine, disclose a kind of safety shield of three-face book cutting machine, including two side covers, top cover, two upper end covers and two lower end covers, lower end cover is hinged on a side cover, side cover is opened with side mouth and is equipped with side door in side mouth, side door is hinged with corresponding side cover, locking assembly is equipped on each side door and lower end cover, drive positioning assembly is equipped between upper end cover and side cover, one upper end cover outside is fixed with transparent protective cover, transparent explosion-proof observation window is equipped on each upper end cover, safety interlock switch is mounted in side door, upper end cover and lower end cover, pressure sensor is mounted in the lower end of upper end cover, safety interlock switch and pressure sensor are electrically connected with three-face book cutting machine.The utility model has the following advantages and effects: cover covers dangerous position, and safety is high;Transparent explosion-proof observation window is convenient for observation, side door, upper end cover and lower end cover can be opened, and it is convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of book trimmer technology, and in particular to a safety cover for a three-sided book trimmer. Background Technology

[0002] A three-sided book trimmer is a printing device used to trim the three sides of a book. It is widely used in the hardcover or paperback binding of books, magazines, and other printed materials. Its core working component is a high-speed cutting blade assembly (usually including a front blade, side blades, and cross blades). Although existing three-sided book trimmers generally have protective covers, the following main problems still exist: 1. Incomplete protection: Some protective covers only cover the blade body, leaving dangerous parts such as the blade edge area, the blade lifting and transmission mechanism (such as connecting rods, cams, chains, and gears), and the book pushing mechanism exposed or insufficiently protected. 1. Risk of serious injury due to accidental contact with operators; 2. Difficulty in observation: Traditional metal protective covers hinder operators from observing the cutting process and book positioning in real time, affecting operational efficiency and accuracy; 3. Cumbersome maintenance: When it is necessary to clean the accumulated debris under the blade, replace the blade, or perform equipment maintenance, the disassembly and installation process of the integral or fixed protective cover is cumbersome and time-consuming, affecting production efficiency; 4. Lack of interlock protection: Some protective covers are not interlocked with the main control system of the equipment. When the protective cover is accidentally opened or not closed properly, the equipment can still start and run, posing a major safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a safety cover for a three-sided book cutter, which has the advantages of high safety and easy observation and maintenance.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a safety cover for a three-sided book trimmer, characterized in that: it includes side covers fixed to both sides of the three-sided book trimmer, a top cover fixed between the upper ends of the two side covers, two upper covers located at the front and rear ends of the three-sided book trimmer and respectively hinged to both ends of the top cover, and two lower covers located at the front and rear ends of the three-sided book trimmer, the lower covers being located below the upper covers, and one end of each of the two lower covers being hinged to one of the side covers. Both ends of the cover have side openings with side doors inside. One side of each side door is hinged to the corresponding side cover. Each side door and the lower cover have locking components. The locking components on the side doors can fix them to the corresponding side cover, and the locking components on the lower cover can fix them to the other side cover. A drive positioning component is provided between the upper cover and the two side covers, and the drive positioning component can drive the corresponding upper cover to swing around the hinge point. The upper cover of the three-sided book trimmer is actuated for opening and closing. A transparent protective cover is fixed to the outside of the upper cover located at the front end of the three-sided book trimmer, extending to the outside of the movement path of the book pushing mechanism. The side covers, side doors, top cover, upper cover, lower cover, and transparent protective cover cooperate to cover the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper presser, the paper presser drive mechanism, and the book pushing mechanism for safety protection. Each upper cover is equipped with a transparent explosion-proof observation window. The two side covers... Safety interlock switches are installed on the door, the two upper covers, and the two lower covers. All safety interlock switches are electrically connected to the main control system of the three-sided book trimmer. The side door, the upper cover, and the lower cover have a first state in which the three-sided book trimmer is operating normally when all three are closed, and a second state in which the three-sided book trimmer stops operating when any one of the side door, the upper cover, or the lower cover is opened. Pressure sensors are installed on the lower inner side of the two upper covers. The pressure sensors are electrically connected to the main control system of the three-sided book trimmer.

[0005] By adopting the above technical solution, the side cover, side door, upper cover, transparent protective cover, transparent explosion-proof observation window, lower cover, and top cover work together to cover dangerous parts such as the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper presser, the paper presser drive mechanism, and the book pushing mechanism, providing comprehensive protection for the staff. The locking components on the side door lock it to the corresponding side cover, and the locking components on the lower cover fix it to the corresponding side cover. There are drive positioning components between the two upper covers and the two side covers, which can position the corresponding upper cover on the side cover. Due to the setting of the safety interlock switch, when the side door, upper cover, or lower cover is opened, the safety interlock switch immediately transmits a signal to the main control system of the three-sided book cutter, thereby triggering the emergency brake. The program allows the three-sided book trimmer to stop operating in a very short time. Furthermore, if the pressure sensor on the upper cover senses pressure when it is closed, it will transmit a signal to the main control system of the three-sided book trimmer. The main control system then controls the drive positioning component to open the upper cover, preventing workers from being trapped and improving safety. A transparent explosion-proof observation window is provided on the surface of the protective cover, allowing operators to observe the equipment's operating status without opening the cover. When maintenance is required, stopping the machine and opening the side door, upper cover, and lower cover exposes dangerous parts such as the cutting blade assembly, the cutting blade assembly lifting drive mechanism, the paper pressure device, the paper pressure device drive mechanism, and the book pushing mechanism, making maintenance very convenient. Due to the safety interlock switch, the machine will not operate during maintenance, ensuring high safety.

[0006] A further feature of this invention is that: each of the two ends of the top cover has an outwardly extending connecting portion at its center; each of the two upper covers has an mounting groove at its upper end for embedding into the corresponding connecting portion; a horizontally arranged pin passes through the connecting portion; the two ends of the pin are respectively hinged to the opposite side walls of the mounting groove; and strip plates are fixed at both ends of the inner sides of the two side covers for abutting against the corresponding inner sides of the upper cover; the drive positioning assembly includes a support rod, a sleeve sleeved on the support rod, a servo motor fixed inside the sleeve, a lead screw fixed to the output shaft of the servo motor, and a nut sleeved on the lead screw; the sleeve and the lead screw are both along... The support rod extends along its length, with one end located inside the sleeve and an inner hole for the lead screw to pass through at the middle of that end. The inner hole extends along the length of the support rod. The lead screw nut is fixedly connected to the end of the support rod inside the sleeve, and the outer circumferential side of the end of the support rod inside the sleeve has an outwardly extending guide portion. The inner side of the sleeve has a guide groove extending along its length for the guide portion to be embedded in. The end of the sleeve away from the support rod and the end of the support rod outside the sleeve are respectively hinged to the corresponding upper cover and the corresponding side cover. The servo motor is electrically connected to the main control system of the three-sided book trimmer.

[0007] By adopting the above technical solution, the servo motor drives the lead screw to rotate, thereby causing the lead screw nut to move the support rod in the length direction of the sleeve to drive the corresponding upper cover to rotate around the pin shaft for opening and closing. The combination of servo motor, lead screw nut and lead screw has high precision and fast response, which improves the efficiency and accuracy of opening and closing the upper cover.

[0008] A further feature of this invention is that: a sealing cap one and a sealing cap two are respectively fastened to both ends of the sleeve; a wire is provided between the servo motor and the main control system of the three-sided book trimmer; a through hole one is provided on the sealing cap one for the wire to pass through; a sealing plug one is fitted on the outside of the wire and inserted into the through hole one; a through hole two is provided on the sealing cap two for the support rod to pass through; a sealing plug two is fitted on the outside of the support rod and inserted into the through hole two; the outer side of the sealing cap one has an abutting part one extending toward the bottom of the strip plate groove; and the outer side of the sealing cap two has an abutting part two extending toward the bottom of the strip plate groove.

[0009] By adopting the above technical solution, the sealing cover one, sealing cover two, sealing plug one and sealing plug two are set to seal both ends of the sleeve, which can prevent foreign objects from entering the sleeve, ensure the normal operation of the servo motor, screw nut and screw, and provide a guarantee for the normal opening and closing of the upper cover.

[0010] A further feature of this invention is that: both sides of the upper cover are fixed with a transverse connecting shaft one; the inner side of the side cover is rotatably connected with a transverse connecting shaft two; the end of the sleeve away from the support rod has a shaft connecting part one that is rotatably connected to the connecting shaft one; and the end of the support rod located outside the sleeve has a shaft connecting part two that is rotatably connected to the connecting shaft two.

[0011] By adopting the above technical solution, when the servo motor is working, the lead screw and lead nut drive support rod can ensure that the upper cover rotates around the pin shaft to open and close when it moves in the length direction of the sleeve, thereby improving the reliability of the drive positioning component in driving the opening and closing of the corresponding upper cover.

[0012] A further feature of this invention is that the side cover has several heat dissipation holes.

[0013] By adopting the above technical solution, heat dissipation holes are provided to facilitate heat dissipation for the three-sided book trimmer.

[0014] A further feature of this invention is that an emergency stop button is installed at each end of one of the side covers near the lower end of the corresponding upper cover.

[0015] By adopting the above technical solution, the emergency stop button makes it easier for staff to control the equipment to stop suddenly in case of an emergency, reducing injury and loss.

[0016] A further feature of this invention is that: an inlet for books to enter is provided at the lower center of the upper cover located at the front end of the three-sided book trimmer, and a transparent protective cover extending to the outside of the movement path of the book pushing mechanism is fixed on the outer side of the upper cover near the inlet; the lower end of the transparent protective cover is spaced from the upper side of the worktable of the three-sided book trimmer; and an outlet for books to exit is provided at the lower center of the upper cover located at the rear end of the three-sided book trimmer.

[0017] By adopting the above technical solution, the transparent protective cover is used to isolate the pushing mechanism and staff, providing safety for the staff.

[0018] The present invention is further configured such that: pressure sensors are provided at the lower end of the transparent protective cover and the lower end of the upper cover on both sides of the transparent protective cover; an infrared sensor is provided at the lower end of the inner side of the transparent protective cover; an audible and visual alarm is fixed on the upper side of the top cover; and the infrared sensor and the audible and visual alarm are both electrically connected to the main control system of the three-sided book trimmer.

[0019] By adopting the above technical solutions, pressure sensors are installed at the lower end of the transparent protective cover and at the lower end of the upper cover on both sides of the transparent protective cover. These are the locations where workers are most likely to be trapped, thus improving the safety of workers during operation. Infrared sensors are installed to detect whether foreign objects have entered the danger zone. When a foreign object enters the danger zone, the infrared sensor immediately transmits a signal to the main control system of the three-sided book trimmer, causing the equipment to stop operating in a very short time, thus improving the safety of the equipment during operation. An audible and visual alarm can sound an alarm to remind workers to pay attention to safety when abnormal situations occur.

[0020] A further feature of this invention is that the locking assembly includes a positioning rod passing through the side door or the lower cover. The two ends of the positioning rod are located on the inner and outer sides of the corresponding side door or the corresponding lower cover, respectively. A handle extending towards the outer periphery of the positioning rod is fixed at the outer end of the positioning rod corresponding to the side door or the corresponding lower cover. A positioning part along the length direction of the handle is fixed at the outer periphery of the inner end of the positioning rod corresponding to the side door or the corresponding lower cover. A telescopic spring is sleeved on the positioning rod at the position corresponding to the outer side of the side door or the corresponding lower cover. One end of the telescopic spring is fixed on the positioning rod and the other end abuts against the outer surface of the corresponding side door or the corresponding lower cover.

[0021] By adopting the above technical solution, pulling and rotating the positioning rod can open or close the corresponding side door or the corresponding lower cover, which is very convenient. Here, the extension and retraction of the telescopic spring allows the positioning part of the positioning rod to press against the corresponding side cover, improving the reliability of locking the side door and the lower cover.

[0022] A further feature of this invention is that the safety interlock switch is a limit switch, a proximity switch, or a magnetic switch.

[0023] By adopting the above technical solutions, the limit switch, proximity switch and magnetic switch are all micro switches, which have the advantage of high response. Any one of them can transmit a signal to the main control system of the three-sided book cutter when the side door, upper cover or lower cover is opened, ensuring the safety of the staff.

[0024] The beneficial effects of this utility model are: 1. The side cover, side door, upper cover, transparent protective cover, transparent explosion-proof observation window, lower cover, and top cover work together to cover dangerous parts such as the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper presser, the paper presser drive mechanism, and the book pushing mechanism. The safety interlock switch ensures that when the side door, upper cover, or lower cover is opened, the safety interlock switch immediately transmits a signal to the main control system of the three-sided book trimmer, thereby triggering the emergency braking program and stopping the three-sided book trimmer in a very short time, ensuring high safety.

[0025] 2. Pressure sensors are installed at the lower end of the upper cover and the lower end of the transparent protective cover. When the upper cover is closed, if a worker or foreign object is caught, the pressure sensor will transmit a signal to the main control system of the three-sided book trimmer. The main control system of the three-sided book trimmer will control the drive positioning component to open the upper cover in the reverse direction, thereby improving the safety of the worker during operation and ensuring the normal operation of the three-sided book trimmer.

[0026] 3. Each top cover is equipped with a transparent explosion-proof observation window, which allows operators to observe the cutting process and book positioning in real time, improving operational efficiency and accuracy.

[0027] 4. When maintaining the equipment, after stopping the machine, open the upper cover, lower cover, and side door to expose the three blades of the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper presser, the paper presser drive mechanism, and the book pushing mechanism, which are dangerous parts. This makes it easier for staff to maintain the equipment. Due to the safety interlock switch, the equipment will not operate during maintenance or cleaning, which improves safety.

[0028] 5. An infrared sensor is installed to detect whether foreign objects enter the danger zone. When a foreign object enters the danger zone, the three-sided book cutter can stop operating in a very short time, improving the safety of the staff during equipment operation and ensuring the normal operation of the equipment; the sound and light alarm is set to issue an alarm to remind the staff to pay attention to safety when an abnormal situation occurs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 .

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 .

[0031] Figure 3 This is a schematic diagram of the top cover structure in this utility model.

[0032] Figure 4 This is a schematic diagram of the connection structure between the upper cover and the transparent protective cover in this utility model. Figure 1 .

[0033] Figure 5 This is a schematic diagram of the connection structure between the upper cover and the transparent protective cover in this utility model. Figure 2 .

[0034] Figure 6 This is a schematic diagram of the structure of the drive positioning component in this utility model. Figure 1 .

[0035] Figure 7 This is a schematic diagram of the structure of the drive positioning component in this utility model. Figure 2 .

[0036] Figure 8 This is a cross-sectional view of the drive positioning component in this utility model.

[0037] Figure 9 This is a schematic diagram of the structure of the sealing cover in this utility model.

[0038] Figure 10 This is a schematic diagram of the structure of the sealing cap 2 in this utility model.

[0039] Figure 11 This is a schematic diagram of the structure of the lower end cover in this utility model. Figure 1 .

[0040] Figure 12 This is a schematic diagram of the structure of the lower end cover in this utility model. Figure 2 .

[0041] Figure 13 This is a schematic diagram of the connection structure between the side cover and the side door in this utility model.

[0042] In the diagram, 1. Side cover; 1a. Side opening; 1b. Strip plate; 1c. Heat dissipation hole; 2. Top cover; 2a. Connecting part; 3. Upper cover; 31. Mounting groove; 4. Lower cover; 5. Side door; 6. Locking assembly; 61. Positioning rod; 611. Positioning part; 62. Hand lever; 63. Telescopic spring; 7. Drive positioning assembly; 71. Support rod; 711. Inner hole; 712. Guide part; 713. Shaft connection part two; 72. Sleeve; 721. Guide groove; 722. Shaft connection part one; 73. Servo motor; 74. 75. Lead screw; 76. Nut; 77. Sealing cover one; 78. Through hole one; 79. Abutment part one; 70. Sealing cover two; 71. Through hole two; 72. Abutment part two; 73. Sealing plug one; 74. Sealing plug two; 8. Transparent explosion-proof observation window; 9. Safety interlock switch; 10. Pressure sensor; 11. Pin; 12. Wire; 13. Connecting shaft one; 14. Connecting shaft two; 15. Emergency stop button; 16. Inlet; 17. Transparent protective cover; 18. Outlet; 19. Infrared sensor; 20. Audible and visual alarm. Detailed Implementation

[0043] Example: A safety cover for a three-sided book trimmer, such as Figure 1 and Figure 2 As shown, it includes two side covers 1, a top cover 2, two upper end covers 3, and two lower end covers 4. The two side covers 1 are arranged opposite each other on both sides of the three-sided book trimmer and are fixed to the frame of the three-sided book trimmer. The top cover 2 is horizontally fixed between the two side covers 1. The two upper end covers 3 are located at the front and rear ends of the three-sided book trimmer respectively, and are hinged to the two ends of the top cover 2 respectively. The two lower end covers 4 are located at the front and rear ends of the three-sided book trimmer respectively, and are located below the two upper end covers 3. The upper end covers 3 and the lower end covers 4 are arranged in a one-to-one correspondence.

[0044] Furthermore, such as Figures 1 to 10As shown, the top cover 2 has outwardly extending connecting parts 2a at the middle of both ends. The upper ends of the two upper covers 3 each have mounting grooves 31 for the corresponding connecting parts 2a to be inserted. A horizontally arranged pin 11 passes through the connecting part 2a, and the two ends of the pin 11 are hinged to the opposite side walls of the mounting groove 31. The inner ends of the two side covers 1 are fixed with strip plates 1b for the corresponding inner sides of the upper cover to abut against. A drive positioning assembly 7 is provided between each upper cover 3 and the two side covers 1. The drive positioning assembly 7 includes a support rod 71, a sleeve 72 sleeved on the support rod 71, and a fixed... The sleeve 72 contains a servo motor 73, a lead screw 74 fixedly connected to the output shaft of the servo motor 73, and a nut 75 sleeved on the lead screw 74. Both the sleeve 72 and the lead screw 74 extend along the length of the support rod 71. One end of the support rod 71 is located inside the sleeve 72, and an inner hole 711 for the lead screw 74 to pass through is opened in the middle of this end. The inner hole 711 extends along the length of the support rod 71. The nut 75 is fixedly connected to the end of the support rod 71 located inside the sleeve 72, and the outer circumferential side of the end of the support rod 71 located inside the sleeve 72 has an outwardly extending guide portion 712. The inner side of the sleeve 72 has a guide portion extending along its length. The guide groove 721 extends in the direction and is into which the guide part 712 is embedded. The servo motor 73 is electrically connected to the main control system of the three-sided book trimmer. A sealing cover 76 and a sealing cover 77 are respectively fastened to both ends of the sleeve 72. A wire 12 is provided between the servo motor 73 and the main control system of the three-sided book trimmer. A through hole 761 for the power supply wire 12 is opened on the sealing cover 76. A sealing plug 78 is fitted on the outside of the wire 12 and inserted into the through hole 761. A through hole 771 for the support rod 71 is opened on the sealing cover 77. A sealing plug 79 is fitted on the outside of the support rod 71. The sealing plug 79 is inserted into the through hole 771. The outer side of the sealing cover 76 is provided with an abutment part 762 that can abut against the corresponding strip plate 1b. The outer side of the sealing cover 77 is provided with an abutment part 772 that can abut against the corresponding strip plate 1b. The two sides of the upper cover 3 are fixed with a transverse connecting shaft 13. The inner side of the side cover 1 is rotatably connected with a transverse connecting shaft 14. The end of the sleeve 72 away from the support rod 71 has a shaft connecting part 722 that is rotatably connected to the connecting shaft 13. The end of the support rod 71 located outside the sleeve 72 has a shaft connecting part 713 that is rotatably connected to the connecting shaft 14.

[0045] Furthermore, such as Figures 1 to 5As shown, each upper cover 3 is equipped with a transparent explosion-proof observation window 8. The lower middle part of the upper cover 3 at the front of the three-sided book trimmer has an inlet 16 for books to enter, and a transparent protective cover 17 extending to the outside of the movement path of the book pushing mechanism is fixed on the outside of the upper cover 3 near the inlet 16. There is a gap between the lower end of the transparent protective cover 17 and the upper side of the worktable of the three-sided book trimmer. The lower middle part of the upper cover 3 at the rear of the three-sided book trimmer has an outlet 18 for books to exit. Pressure sensors 10 are provided at the lower end of the transparent protective cover 17, at both sides of the lower end of the upper cover 3 at the front of the three-sided book trimmer, and at the lower end of the upper cover 3 at the rear of the three-sided book trimmer. An infrared sensor 19 is also provided on the inner side of the transparent protective cover 17 near the lower end. An audible and visual alarm 20 is fixed on the upper side of the top cover 2. The pressure sensor 10, the infrared sensor 19, and the audible and visual alarm 20 are all electrically connected to the main control system of the three-sided book trimmer.

[0046] Furthermore, such as Figure 1 , Figure 2 , Figure 11 , Figure 12 and Figure 13 As shown, one end of each of the two lower end covers 4 is hinged to both ends of one of the side covers 1. Each of the two side covers 1 has a side opening 1a and a side door 5 inside the side opening 1a. One side of the side door 5 is hinged to the corresponding side cover 1. Each side door 5 and each lower end cover 4 is provided with a locking component 6. The locking component 6 on the side door 5 can fix it to the corresponding side cover 1, and the locking component 6 on the lower end cover 4 can fix it to the other side cover 1. The locking component 6 includes a positioning rod 61 that passes through the side door 5 or the lower end cover 4. The two ends of the positioning rod 61 are respectively located at the corresponding side door 5 or the corresponding lower end cover 4. On both the inner and outer sides of the cover 4, the positioning rod 61 is fixed with a handle 62 extending towards the outer circumference of the corresponding side door 5 or the corresponding lower cover 4 at one end. The positioning rod 61 is fixed with a positioning part 611 along the length direction of the handle 62 at the outer circumference of the corresponding side door 5 or the corresponding lower cover 4 at one end. A telescopic spring 63 is sleeved on the positioning rod 61 at the position on the outer side of the corresponding side door 5 or the corresponding lower cover 4. One end of the telescopic spring 63 is fixed on the positioning rod 61 and the other end abuts against the outer surface of the corresponding side door 5 or the corresponding lower cover 4. Several heat dissipation holes 1c are also provided on the side cover 1.

[0047] Furthermore, such as Figure 1 , Figure 2 and Figure 12As shown, safety interlock switches 9 are installed on the two upper covers 3, the two lower covers 4, and the two side doors 5. All safety interlock switches 9 are electrically connected to the main control system of the three-sided book trimmer. The side doors 5, the upper covers 3, and the lower covers 4 have a first state in which the three-sided book trimmer is in normal operation when all three are closed, and a second state in which the three-sided book trimmer stops operating when any one of the side doors 5, the upper covers 3, or the lower covers 4 is opened. The safety interlock switches 9 here are limit switches, proximity switches, or magnetic switches.

[0048] Furthermore, such as Figure 1 and Figure 2 As shown, one of the side covers 1 has an emergency stop button 15 installed at each end near the lower end of the corresponding upper cover 3.

[0049] Working principle: The side cover 1, side door 5, top cover 2, upper cover 3, transparent explosion-proof observation window 8, lower cover 4, and transparent protective cover 17 work together to cover the three blades of the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper presser, the paper presser drive mechanism, and the book pushing mechanism for safety protection. The safety interlock switch 9 ensures that when the side door 5, upper cover 3, and lower cover 4 are opened during operation, the corresponding safety interlock switch 9 will immediately transmit a signal to the three-sided book trimmer. The main control system triggers an emergency braking procedure, stopping the three-sided book trimmer in a very short time. A transparent, explosion-proof observation window 8 allows operators to observe the trimming process and book positioning during operation. When the upper cover 3 is closed, if a worker or foreign object is caught, the pressure sensor 10 transmits a signal to the main control system. The main control system then controls the servo motor 73 to reverse the lead screw 74, driving the upper cover 3 to open in the opposite direction, thus improving operator safety during operation. Safety is ensured, guaranteeing the normal operation of the three-sided book trimmer. When maintenance is required, the machine can be stopped, and the upper cover 3, lower cover 4, and side door 5 can be opened. The upper cover 3 can be opened by controlling the servo motor 73 via the central control screen of the three-sided book trimmer. To open the lower cover 4, simply hold the handle 62 of the lower cover 4, pull the positioning rod 61 on the lower cover 4, and then rotate the positioning rod 61. To open the side door 5, simply hold the handle 62 on the side door 5, pull the positioning rod 61 on the side door 5, and then rotate the positioning rod 61. This exposes dangerous parts such as the cutting blade assembly, the lifting drive mechanism of the cutting blade assembly, the paper pressure device, the paper pressure device drive mechanism, and the book pushing mechanism, making maintenance very convenient for staff. Due to the safety interlock switch 9, the equipment will not operate during maintenance, ensuring safety. The infrared sensor 19 is used to detect whether foreign objects enter the danger zone through the inlet 16, and the audible and visual alarm 20 sounds an alarm to remind staff to pay attention to safety when an abnormal situation occurs.

Claims

1. A safety guard for a three-sided book trimmer, characterized in that: The device includes side covers (1) fixed to both sides of the three-sided book trimmer, a top cover (2) fixed between the upper ends of the two side covers (1), two upper covers (3) located at the front and rear ends of the three-sided book trimmer and respectively hinged to the two ends of the top cover (2), and two lower covers (4) located at the front and rear ends of the three-sided book trimmer. The lower covers (4) are located below the upper covers (3). One end of each of the two lower covers (4) is respectively hinged to the two ends of one of the side covers (1). Each of the two side covers (1) has a side opening (1a) and a side door (5) is provided in the side opening (1a). (5) is hinged to the corresponding side cover (1) on one side. Each side door (5) and the lower cover (4) are provided with a locking component (6). The locking component (6) on the side door (5) can fix it to the corresponding side cover (1). The locking component (6) on the lower cover (4) can fix it to another side cover (1). A drive positioning component (7) is provided between the upper cover (3) and the two side covers (1). The drive positioning component (7) can drive the corresponding upper cover (3) to swing around the hinge point to open and close the three-sided book cutter. The upper cover (3) is located at the front end of the three-sided book cutter. A transparent protective cover (17) is fixed on the outside of the upper cover (3) extending to the outside of the movement path of the book pushing mechanism. The side covers (1), the side doors (5), the top cover (2), the upper cover (3), the lower cover (4), and the transparent protective cover (17) cooperate to cover the cutting knife group, the lifting drive mechanism of the cutting knife group, the paper presser, the paper presser drive mechanism, and the book pushing mechanism for safety protection. Each upper cover (3) is equipped with a transparent explosion-proof observation window (8). The two side doors (5) and the two upper covers (3) and the two lower covers (4) are all equipped with safety interlock switches (9). All the safety interlock switches (9) are electrically connected to the main control system of the three-sided book trimmer. The side door (5), the upper cover (3) and the lower cover (4) are all in a first state where the three-sided book trimmer is operating normally when they are all closed, and a second state where the three-sided book trimmer stops operating when any of the side door (5), the upper cover (3) or the lower cover (4) is opened. Pressure sensors (10) are installed on the lower inner side of the two upper covers (3). The pressure sensors (10) are electrically connected to the main control system of the three-sided book trimmer.

2. The safety guard for a three-sided book trimmer according to claim 1, characterized in that: The top cover (2) has outwardly extending connecting parts (2a) at the middle of both ends. The upper ends of the two upper covers (3) have mounting grooves (31) for the corresponding connecting parts (2a) to be inserted. A horizontally arranged pin (11) is passed through the connecting part (2a). The two ends of the pin (11) are respectively hinged to the two side walls of the mounting groove (31). The inner ends of the two side covers (1) are fixed with strip plates (1b) for the corresponding inner sides of the upper cover (3). The drive positioning assembly (7) includes a support rod (71), a sleeve (72) sleeved on the support rod (71), a servo motor (73) fixed in the sleeve (72), a lead screw (74) fixed to the output shaft of the servo motor (73), and a nut (75) sleeved on the lead screw (74). The sleeve (72) and the lead screw (74) are both along the support rod (71). Extending along the length direction, one end of the support rod (71) is located inside the sleeve (72), and an inner hole (711) is provided in the middle of the end for the lead screw (74) to pass through. The inner hole (711) extends along the length direction of the support rod (71). The nut (75) is fixedly connected to one end of the support rod (71) located inside the sleeve (72), and the outer peripheral side of the end of the support rod (71) located inside the sleeve (72) has an outwardly extending guide portion (712). The inner side of the sleeve (72) has a guide groove (721) extending along its length direction for the guide portion (712) to be embedded. The end of the sleeve (72) away from the support rod (71) and the end of the support rod (71) located outside the sleeve (72) are respectively hinged to the corresponding upper cover (3) and the corresponding side cover (1). The servo motor (73) is electrically connected to the main control system of the three-sided book cutter.

3. The safety guard for a three-sided book trimmer according to claim 2, characterized in that: The sleeve (72) is fastened with a sealing cap one (76) and a sealing cap two (77) at its two ends respectively. A wire (12) is provided between the servo motor (73) and the main control system of the three-sided book trimmer. A through hole (761) is provided on the sealing cap one (76) for the wire (12) to pass through. A sealing plug one (78) is fitted on the outside of the wire (12). The sealing plug one (78) is inserted into the through hole one (761). The sealing cap two (77) is fastened with a sealing cap two (761) for the wire (12) to pass through. The support rod (71) has a through hole (771) for the support rod (71) to pass through. A sealing plug (79) is fitted on the outside of the support rod (71). The sealing plug (79) is inserted into the through hole (771). The sealing cover (76) has an abutment portion (762) extending towards the bottom of the groove of the strip plate (1b) on its outside. The sealing cover (77) has an abutment portion (772) extending towards the bottom of the groove of the strip plate (1b) on its outside.

4. The safety guard for a three-sided book trimmer according to claim 3, characterized in that: The upper cover (3) has a horizontal connecting shaft one (13) fixed on both sides. The side cover (1) is rotatably connected to a horizontal connecting shaft two (14). The sleeve (72) has a shaft connecting part one (722) rotatably connected to the connecting shaft one (13) at one end away from the support rod (71). The support rod (71) has a shaft connecting part two (713) rotatably connected to the connecting shaft two (14) at one end outside the sleeve (72).

5. A safety guard for a three-sided book trimmer according to any one of claims 1 to 4, characterized in that: The side cover (1) has several heat dissipation holes (1c).

6. A safety guard for a three-sided book trimmer according to any one of claims 1 to 4, characterized in that: One of the side covers (1) has an emergency stop button (15) installed at each end near the lower end of the corresponding upper cover (3).

7. The safety guard for a three-sided book trimmer according to claim 6, characterized in that: The upper cover (3) located at the front end of the three-sided book trimmer has an inlet (16) for books to enter at the middle of its lower end, and a transparent protective cover (17) extending to the outside of the movement path of the book pushing mechanism is fixed on the outer side of the upper cover (3) near the inlet (16). There is a gap between the lower end of the transparent protective cover (17) and the upper side of the worktable of the three-sided book trimmer. The upper cover (3) located at the rear end of the three-sided book trimmer has an outlet (18) for books to be output at the middle of its lower end.

8. The safety guard for a three-sided book trimmer according to claim 7, characterized in that: Pressure sensors (10) are provided at the lower end of the transparent protective cover (17) and the lower end of the upper cover (3) on both sides of the transparent protective cover (17). An infrared sensor (19) is provided on the inner side of the transparent protective cover (17) near the lower end. An audible and visual alarm (20) is fixed on the upper side of the top cover (2). The infrared sensor (19) and the audible and visual alarm (20) are both electrically connected to the main control system of the three-sided book cutter.

9. A safety guard for a three-sided book trimmer according to claim 7, characterized in that: The locking assembly (6) includes a positioning rod (61) passing through the side door (5) or the lower cover (4). The two ends of the positioning rod (61) are located on the inner and outer sides of the corresponding side door (5) or the corresponding lower cover (4). The end of the positioning rod (61) located on the outer side of the corresponding side door (5) or the corresponding lower cover (4) is fixed with a handle (62) extending towards the outer side of the positioning rod (61). The outer periphery of the end of the positioning rod (61) located on the inner side of the corresponding side door (5) or the corresponding lower cover (4) is fixed with a positioning part (611) along the length direction of the handle (62). A telescopic spring (63) is sleeved on the positioning rod (61) located on the outer side of the corresponding side door (5) or the corresponding lower cover (4). One end of the telescopic spring (63) is fixed on the positioning rod (61) and the other end abuts against the outer surface of the corresponding side door (5) or the corresponding lower cover (4).

10. A safety guard for a three-sided book trimmer according to claim 9, characterized in that: The safety interlock switch (9) is a limit switch, proximity switch or magnetic switch.

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