Sol machine

By designing a sol machine including a servo motor, a metering gear pump and a pressure regulating valve, the problem that the existing sol machine cannot monitor and accurately control the glue output flow in real time, real-time monitoring of the working status of the sol machine and precise control of the glue output flow are achieved, and different needs in production are met.

CN222587141UActive Publication Date: 2025-03-11JIANGMEN WAHRHEITS IND CO LTD
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Patent Information

Application Number
CN202421108670.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-20
Publication Date
2025-03-11
Estimated Expiration
2034-05-20

AI Technical Summary

Technical Problem

Existing sol machines cannot monitor and accurately control the output flow of glue in real time, and cannot meet the different needs in production.

Method used

A sol machine is designed, including a rubber storage cylinder, a conveying mechanism, a rubber coating seat and an operating display panel. The metering gear pump is driven by a servo motor to accurately control the conveying amount of glue, and the output pressure is adjusted through the pressure regulating valve to ensure the accuracy and stability of the output flow. The operation display panel is used to monitor and control the working status of the sol machine in real time.

Benefits of technology

Real-time monitoring of the working status of the sol machine and precise control of the glue output flow are achieved, which meets different needs in production and improves production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a glue dissolving machine which comprises a glue storage cylinder, a conveying mechanism, a glue coating seat and an operation display panel, the glue storage cylinder is provided with a glue inlet and a glue outlet, and a heating device is arranged in the glue storage cylinder; the conveying mechanism comprises a servo motor and a metering gear pump, an output shaft of the servo motor is in transmission connection with the metering gear pump, and an input port of the metering gear pump is connected with a glue outlet of the glue storage cylinder through a pipeline; an output port is formed in the outer wall of the gluing seat, a material conveying pipeline is arranged in the gluing seat, one end of the material conveying pipeline is communicated with the output port, the other end of the material conveying pipeline is connected with an output port of the metering gear pump through a pipeline, and the material conveying pipeline is provided with a pressure regulating valve; the operation display panel is used for displaying the working state of the sol machine and controlling the sol machine, and the servo motor and the pressure regulating valve are both electrically connected with the operation display panel. According to the glue dissolving machine provided by the embodiment of the utility model, the working state of the glue dissolving machine can be monitored in real time, and the output flow of glue can be accurately controlled.
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Description

Technical Field

[0001] The utility model relates to the technical field of colloidal sol equipment, in particular to a colloidal sol machine. Background Art

[0002] Hot melt glue machine is mainly used for automatic application equipment of hot melt glue spraying, scraping, rolling, coating and injecting. It is widely used in household products (disposable products such as diapers, sanitary napkins, mousetraps, cockroach houses, etc.), automotive industry (interior sealing, lamp manufacturing, windshield assembly, air filter, non-woven fabric composite, footwear, printing, electronic product assembly, clothing, self-adhesive stickers, packaging industry (carton packaging, cigarette box packaging, Tetra Pak beverage packaging), coating and composite industry (trademark paper, label double-sided tape, medical breathable tape), book binding and other industries. In the prior art, the glue sol machine heats the glue in the glue sol tank and then outputs the glue through the pump body. The flow rate cannot be monitored and accurately controlled during the glue spraying process, resulting in the inability to meet different production needs. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a glue sol machine, which can monitor the working state of the glue sol machine in real time and accurately control the output flow of glue.

[0004] A glue sol machine according to the utility model includes a glue storage cylinder, a conveying mechanism, a glue coating seat and an operation display panel, the glue storage cylinder has a glue inlet and a glue outlet, and a heating device is arranged in the glue storage cylinder; the conveying mechanism includes a servo motor and a metering gear pump, the output shaft of the servo motor is transmission-connected to the metering gear pump, and the input port of the metering gear pump is connected to the glue outlet of the glue storage cylinder through a pipeline; the outer wall of the glue coating seat is provided with an output port, and the glue coating seat is provided with a material delivery pipeline, one end of the material delivery pipeline is connected to the output port, and the other end is connected to the output port of the metering gear pump through a pipeline, and the material delivery pipeline is provided with a pressure regulating valve; the operation display panel is used to display the working status of the glue sol machine and control the glue sol machine, and the servo motor and the pressure regulating valve are both electrically connected to the operation display panel.

[0005] According to the above embodiments of the utility model, at least the following beneficial effects are achieved:

[0006] The glue sol machine provided by the embodiment of the utility model heats the glue through a heating device, transports the glue in the glue storage cylinder to the feed pipe through a metering gear pump, and outputs the glue through an output port, drives the metering gear pump through a servo motor to accurately control the glue delivery amount, and sets a pressure regulating valve to adjust the pressure of the glue output from the feed pipe, thereby further ensuring the accuracy and stability of the glue output flow rate to meet different needs in production; the glue sol machine provided by the embodiment of the utility model also monitors the working status of the glue sol machine in real time through an operation display panel, connects the pressure regulating valve through the operation display panel to monitor the working status of the glue output from the feed pipe in real time, and can control the servo motor according to the feedback of the monitoring data to achieve accurate and stable glue output flow rate.

[0007] According to some embodiments of the utility model, the heating device includes a plurality of heating components, and the plurality of heating components are evenly spaced along the up and down directions of the glue storage cylinder. The heating components include a plurality of electric heating plates, and the plurality of electric heating plates are evenly spaced along the circumference of the glue storage cylinder. The electric heating plates are connected to the inner wall of the glue storage cylinder, and the electric heating plates are electrically connected to the operation display panel.

[0008] According to some embodiments of the utility model, the glue storage cylinder is provided with a temperature sensor, and the temperature sensor is electrically connected to the operation display panel.

[0009] According to some embodiments of the utility model, the operation display panel includes a touch screen, a power switch, a standby indicator light, an alarm indicator light and a ready indicator light, the power switch is located below the touch screen, and the standby indicator light, the alarm indicator light and the ready indicator light are arranged side by side and located above the touch screen.

[0010] According to some embodiments of the utility model, it also includes a melting cylinder box and an electric control box, the glue storage cylinder is installed in the melting cylinder box, the top of the melting cylinder box is provided with a first opening, the glue inlet of the glue storage cylinder is connected to the first opening, the top of the melting cylinder box is hinged with a door panel to open or close the first opening, the electric control box is connected to the side of the melting cylinder box, the electric control box is provided with a power chamber and an electric power chamber that are independent of each other, the servo motor is installed in the power chamber, the inner wall of the power chamber is provided with a through hole connected to the melting cylinder box, the servo motor is connected to the metering gear pump through a universal coupling, the universal coupling is penetrated through the through hole, the electric power chamber is used to install electrical appliances, and the operation display panel is installed on the top of the electric control box.

[0011] According to some embodiments of the utility model, a base is provided at the bottom of the glue storage cylinder, the base is provided with an inner cavity, the glue outlet is connected to the inner cavity, the metering gear pump and the glue coating seat are respectively connected to two sides of the base, a second opening is provided on one side outer wall of the melting cylinder box, the output port is provided on the side of the glue coating seat away from the base, and the output port extends out of the second opening.

[0012] According to some embodiments of the present invention, the second opening is arranged on a side of the melting cylinder box away from the electric control box, and the operation display panel is arranged away from the melting cylinder box.

[0013] According to some embodiments of the utility model, the glue coating seat is provided with two output ports, and the two output ports are arranged side by side. The material delivery pipeline includes a branch pipe, and the branch pipe includes a main pipe and two branch pipes. The branch pipes correspond to the output ports one by one. One end of the branch pipe is connected to the output port, and the other end is connected to the main pipe. The main pipe is connected to the output port of the metering gear pump through a pipeline. The branch pipe is provided with the pressure regulating valve, and the branch pipe is provided with a filter, and the filter is used to filter undissolved rubber blocks.

[0014] According to some embodiments of the utility model, the outer wall of the power cavity is provided with a mounting hole connected to the power cavity, the mounting hole is equipped with a cooling fan, and the outer wall of the electric control box is provided with a heat dissipation hole connected to the power cavity, and the heat dissipation hole is provided with a dust cover.

[0015] According to some embodiments of the utility model, a bottom plate is further included, the melting cylinder box and the electric control box are respectively connected to both sides of the upper end surface of the bottom plate, and pulleys are arranged at the four corners of the lower end surface of the bottom plate.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic diagram of the structure of the sol machine of some embodiments of the utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 It is a partial structural schematic diagram of a sol machine of some embodiments of the utility model;

[0021] Figure 4 It is a partial structural cross-sectional view of a sol machine of some embodiments of the utility model;

[0022] Figure 5 It is another partial structural schematic diagram of the sol machine of some embodiments of the utility model.

[0023] Wherein, the reference numerals are:

[0024] Glue storage cylinder 100; glue inlet 101; glue outlet 102; electric heating plate 110; base 120; inner cavity 121;

[0025] Servo motor 210; metering gear pump 220; universal coupling 230;

[0026] Glue coating seat 300; output port 310; pressure regulating valve 320; filter 330;

[0027] Operation display panel 400; touch screen 410; power switch 420; standby indicator light 430; alarm indicator light 440; ready indicator light 450;

[0028] Melting tank box 500; first opening 501; second opening 502; door panel 510; handle 511;

[0029] Electric control box 600; power cavity 601; power cavity 602; through hole 603; heat dissipation hole 604; cooling fan 610; dust cover 620;

[0030] Base plate 700; pulley 710. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figures 1 to 4 According to a glue sol machine proposed in the utility model, it includes a glue storage cylinder 100, a conveying mechanism, a glue coating seat 300 and an operation display panel 400, the glue storage cylinder 100 has a glue inlet 101 and a glue outlet 102, and a heating device is arranged in the glue storage cylinder 100; the conveying mechanism includes a servo motor 210 and a metering gear pump 220, the output shaft of the servo motor 210 is transmission-connected with the metering gear pump 220, and the input port of the metering gear pump 220 is connected with the glue outlet 102 of the glue storage cylinder 100 through a pipeline; the outer wall of the glue coating seat 300 is provided with an output port 310, and the glue coating seat 300 is provided with a material delivery pipeline, one end of the material delivery pipeline is connected to the output port 310, and the other end is connected to the output port of the metering gear pump 220 through a pipeline, and the material delivery pipeline is provided with a pressure regulating valve 320; the operation display panel 400 is used to display the working state of the glue sol machine and control the glue sol machine, and the servo motor 210 and the pressure regulating valve 320 are both electrically connected to the operation display panel 400.

[0036] Specifically, the glue sol machine provided in the embodiment of the utility model heats the glue through a heating device, transports the glue in the glue storage cylinder 100 to the feed pipeline through the metering gear pump 220, and outputs the glue through the output port 310, drives the metering gear pump 220 through the servo motor 210 to accurately control the delivery amount of the glue, and sets a pressure regulating valve 320 to adjust the pressure of the glue output from the feed pipeline, further ensuring the accuracy and stability of the glue output flow rate to meet different needs in production; the glue sol machine provided in the embodiment of the utility model also monitors the working status of the glue sol machine in real time through the operation display panel 400, connects the pressure regulating valve 320 through the operation display panel 400 to monitor the working status of the glue output from the feed pipeline in real time, and can control the servo motor 210 according to the feedback of the monitoring data to achieve accurate and stable glue output flow rate.

[0037] Specifically, refer to Figure 4According to some embodiments of the present invention, the heating device includes a plurality of heating components, which are evenly spaced along the vertical direction of the glue storage cylinder 100, and the heating components include a plurality of electric heating plates 110, which are evenly spaced along the circumference of the glue storage cylinder 100, and the electric heating plates 110 are connected to the inner wall of the glue storage cylinder 100, and the electric heating plates 110 are electrically connected to the operation display panel 400. Specifically, the uniformly arranged heating components can ensure that the glue in the glue storage cylinder 100 is heated evenly, improve the heating efficiency of the glue, and ensure the smooth progress of the glue spraying work.

[0038] Furthermore, according to some embodiments of the present invention, the glue storage cylinder 100 is provided with a temperature sensor, and the temperature sensor is electrically connected to the operation display panel 400, so that the temperature in the melting cylinder box 500 can be monitored in real time through the operation display panel 400 to ensure the smooth progress of the sol operation.

[0039] Specifically, refer to Figure 5 According to some embodiments of the present invention, the operation display panel 400 includes a touch screen 410, a power switch 420, a standby indicator light 430, an alarm indicator light 440 and a ready indicator light 450. The power switch 420 is located below the touch screen 410, and the standby indicator light 430, the alarm indicator light 440 and the ready indicator light 450 are arranged side by side and located above the touch screen 410. Specifically, the touch screen 410 can display the working state of the gel sol machine, and the operating parameters can be set and the gel sol machine can be controlled through the touch screen 410; the power switch 420 is used to control the power on and off of the gel sol machine, and the power on state is displayed through the power indicator light; if the gel sol machine is ready, the ready indicator light 450 lights up to display the ready state; if an error occurs during the operation of the gel sol machine, the alarm indicator light 440 lights up to display the alarm state.

[0040] It should be noted that the sol machine provided in the embodiment of the utility model is provided with a variety of sensors to monitor the working status of the sol machine in real time. The various sensors are electrically connected to the operation display panel 400 to monitor the working status of the sol machine in real time. When one of the sensors detects an error, the signal is transmitted to the operation display panel 400. The operation display panel 400 controls the sol machine to stop working and controls the alarm indicator light 440 to light up. The type and quantity of sensors can be determined according to actual needs and will not be repeated here.

[0041] Specifically, refer to Figure 3 and Figure 4According to some embodiments of the present invention, the glue sol machine further comprises a melting cylinder box 500 and an electric control box 600, the glue storage cylinder 100 is installed in the melting cylinder box 500, a first opening 501 is arranged on the top of the melting cylinder box 500, and a glue inlet 101 of the glue storage cylinder 100 is connected to the first opening 501, so as to facilitate feeding into the glue storage cylinder 100; a door panel 510 is hinged on the top of the melting cylinder box 500 to open or close the first opening 501, and a handle 511 is arranged on the top of the door panel 510 for easy use. When the glue sol machine is working, the door panel 510 is closed to provide a closed environment for the glue storage cylinder 100, so as to facilitate heating of the glue and avoid Foreign matter enters; the electric control box 600 is connected to the side of the melting cylinder box 500, and the electric control box 600 is provided with a power chamber 601 and an electric power chamber 602 which are independent of each other. The servo motor 210 is installed in the power chamber 601, and the inner wall of the power chamber 601 is provided with a through hole 603 which is connected to the melting cylinder box 500. The servo motor 210 is connected to the metering gear pump 220 through the universal coupling 230, and the universal coupling 230 is passed through the through hole 603. The electric power chamber 602 is used to install electrical appliances, and the operation display panel 400 is installed on the top of the electric control box 600, so that the structure of the sol machine is modularized and more compact, which makes it easier to use and saves space.

[0042] Further, see Figure 1 According to some embodiments of the utility model, the sol machine also includes a bottom plate 700, the melting cylinder box 500 and the electric control box 600 are respectively connected to both sides of the upper end surface of the bottom plate 700, and pulleys 710 are provided at the four corners of the lower end surface of the bottom plate 700, so that the sol machine can be moved and the transfer of the sol machine is convenient.

[0043] Specifically, refer to Figure 3 and Figure 4 According to some embodiments of the present invention, a base 120 is provided at the bottom of the glue storage cylinder 100, and an inner cavity 121 is provided at the base 120. The glue outlet 102 is connected to the inner cavity 121. The metering gear pump 220 and the glue coating seat 300 are respectively connected to the two sides of the base 120. A second opening 502 is provided on the outer wall of one side of the melting cylinder box 500. An output port 310 is provided on the side of the glue coating seat 300 away from the base 120, and the output port 310 extends out of the second opening 502. Specifically, the glue in the glue storage cylinder 100 is transferred to the material delivery pipeline in the glue coating seat 300 through the metering gear pump 220, and is transported to the output port 310 through the material delivery pipeline, and the output port 310 sprays the glue out of the second opening 502.

[0044] Preferably, refer to Figure 3 and Figure 4According to some embodiments of the utility model, a second opening 502 is provided on a side of the melting cylinder box 500 away from the electric control box 600, and the operation display panel 400 is provided away from the melting cylinder box 500 for easy use in actual production. The second opening 502 may also be provided on the other sides of the melting cylinder box 500, or the operation display panel 400 may also be provided in other directions, which may be determined according to actual needs and will not be elaborated herein.

[0045] Preferably, refer to Figure 2 According to some embodiments of the utility model, the glue coating seat 300 is provided with two output ports 310, and the two output ports 310 are arranged side by side. The material delivery pipeline includes a branch pipe, and the branch pipe includes a main pipe and two branch pipes. The branch pipes correspond to the output ports 310 one by one. One end of the branch pipe is connected to the output port 310, and the other end is connected to the main pipe. The main pipe is connected to the output port of the metering gear pump 220 through a pipeline. The branch pipe is provided with a pressure regulating valve 320, and the branch pipe is provided with a filter 330. The filter 330 is used to filter undissolved rubber blocks.

[0046] Specifically, two output ports 310 are provided to meet different production needs. One of the output ports 310 can be used, or both output ports 310 can be used simultaneously. On the other hand, when one of the branch pipes is blocked, the other output port 310 can continue to apply glue, ensuring the smooth progress of the gluing work. The branch pipes are provided with pressure regulating valves 320 to monitor and adjust the pressure of the glue output by the branch pipes. The branch pipes are provided with filters 330 to prevent the block-shaped undissolved glue from affecting the gluing efficiency or even causing blockage. Similarly, the main pipe can also be provided with filters 330, which will not be described in detail here.

[0047] Preferably, refer to Figure 1 and Figure 3 According to some embodiments of the present invention, the outer wall of the power cavity 602 is provided with a mounting hole connected to the power cavity 602, and a cooling fan 610 is installed in the mounting hole. The outer wall of the electric control box 600 is provided with a cooling hole 604 connected to the power cavity 602, and a dust cover 620 is provided in the cooling hole 604. Specifically, the electrical appliances installed in the power cavity 602 will generate heat in the working state, and the cooling fan 610 and the cooling hole 604 are provided to dissipate heat to ensure the normal operation of the electrical appliances. The dust cover 620 is provided through the cooling hole 604 to prevent dust from entering the power cavity 602 and affecting the electrical appliances.

[0048] In the embodiment of the utility model, the connecting member may be a clip or a plate of other shapes, and the connection method may be a snap connection, a screw connection or a welding method, which will not be described in detail here.

[0049] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A sol machine, characterized in that: include: A glue storage cylinder, wherein the glue storage cylinder has a glue inlet and a glue outlet, and a heating device is arranged in the glue storage cylinder; The conveying mechanism comprises a servo motor and a metering gear pump, wherein the output shaft of the servo motor is drivingly connected to the metering gear pump, and the input port of the metering gear pump is connected to the glue outlet of the glue storage cylinder through a pipeline; A glue coating seat, wherein an output port is disposed on the outer wall of the glue coating seat, a material delivery pipeline is disposed inside the glue coating seat, one end of the material delivery pipeline is connected to the output port, and the other end is connected to the output port of the metering gear pump through a pipeline, and the material delivery pipeline is provided with a pressure regulating valve; An operation display panel is used to display the working status of the gel sol machine and control the gel sol machine. The servo motor and the pressure regulating valve are both electrically connected to the operation display panel.

2. The sol machine according to claim 1, characterized in that: The heating device includes a plurality of heating components, which are evenly spaced apart along the up and down directions of the glue storage cylinder. The heating components include a plurality of electric heating plates, which are evenly spaced apart along the circumference of the glue storage cylinder. The electric heating plates are connected to the inner wall of the glue storage cylinder, and are electrically connected to the operation display panel.

3. The colloidal sol machine according to claim 2, characterized in that: The glue storage cylinder is provided with a temperature sensor, and the temperature sensor is electrically connected to the operation display panel.

4. The colloidal sol machine according to claim 1, characterized in that: The operation display panel includes a touch screen, a power switch, a standby indicator light, an alarm indicator light and a ready indicator light, wherein the power switch is located below the touch screen, and the standby indicator light, the alarm indicator light and the ready indicator light are arranged side by side and located above the touch screen.

5. The colloidal sol machine according to claim 1, characterized in that: It also includes a melting cylinder box and an electric control box, the glue storage cylinder is installed in the melting cylinder box, the top of the melting cylinder box is provided with a first opening, the glue inlet of the glue storage cylinder is connected to the first opening, the top of the melting cylinder box is hinged with a door panel to open or close the first opening, the electric control box is connected to the side of the melting cylinder box, the electric control box is provided with a power chamber and an electric power chamber that are independent of each other, the servo motor is installed in the power chamber, the inner wall of the power chamber is provided with a through hole connected to the melting cylinder box, the servo motor is connected to the metering gear pump through a universal coupling, the universal coupling is penetrated through the through hole, the electric power chamber is used to install electrical appliances, and the operation display panel is installed on the top of the electric control box.

6. The colloidal sol machine according to claim 5, characterized in that: A base is provided at the bottom of the glue storage cylinder, and an inner cavity is provided on the base. The glue outlet is connected to the inner cavity. The metering gear pump and the glue coating seat are respectively connected to two sides of the base. A second opening is provided on one outer wall of the melting cylinder box. The output port is provided on the side of the glue coating seat away from the base, and the output port extends out of the second opening.

7. The colloidal sol machine according to claim 6, characterized in that: The second opening is arranged on a side of the melting cylinder box away from the electric control box, and the operation display panel is arranged away from the melting cylinder box.

8. The colloidal sol machine according to claim 6, characterized in that: The glue coating seat is provided with two output ports, and the two output ports are arranged side by side. The material delivery pipeline includes a branch pipe, and the branch pipe includes a main pipe and two branch pipes. The branch pipes correspond to the output ports one by one. One end of the branch pipe is connected to the output port, and the other end is connected to the main pipe. The main pipe is connected to the output port of the metering gear pump through a pipeline. The branch pipe is provided with the pressure regulating valve, and the branch pipe is provided with a filter, and the filter is used to filter undissolved rubber blocks.

9. The colloidal sol machine according to claim 5, characterized in that: The outer wall of the power cavity is provided with a mounting hole connected to the power cavity, and the mounting hole is equipped with a cooling fan. The outer wall of the electric control box is provided with a cooling hole connected to the power cavity, and the cooling hole is provided with a dust cover.

10. The colloidal sol machine according to claim 5, characterized in that: It also includes a bottom plate, the melting cylinder box and the electric control box are respectively connected to both sides of the upper end surface of the bottom plate, and pulleys are arranged at the four corners of the lower end surface of the bottom plate.