High-temperature furnace of power and free chain coating assembly line

Abstract

The invention relates to a high-temperature furnace of a power and free chain coating assembly line, which is provided with a furnace body and a furnace chamber, and is provided with a stay monitoring device for sending out a first signal when a bearing trolley reaches a specified position in the furnace chamber; the staying monitoring device comprises a high-temperature transmission unit installed in a furnace cavity of the high-temperature furnace and a low-temperature alarm unit installed on the outer side of a furnace body, the high-temperature transmission unit comprises an in-furnace installation base fixed relative to a bearing rail, a push plate movably connected to the in-furnace installation base and a traction piece, and one end of the traction piece is fixed to the push plate. The low-temperature alarm unit comprises an out-of-furnace mounting base fixedly mounted on the furnace body, a counterweight part connected with the other end of the traction part and a first sensor used for detecting the position of the counterweight part, and at least part of the push plate is located on the moving path of the bearing trolley; the first sensor is configured to send a first signal to the outside when detecting that the bearing trolley reaches a specified position in the furnace.

Description

Technical Field

[0001] The invention relates to the technical field of surface coating, in particular to a high-temperature furnace of an accumulation and release chain coating line. Background Art

[0002] The painting line is used to perform surface painting operations on workpieces. Among them, the accumulation chain painting line usually includes a carrying track extending along a conveying direction, an accumulation chain, and multiple carrying carts that can move along the carrying track. Multiple processing positions are arranged along the carrying track, such as powder spraying, painting, leveling, drying, curing, etc. After the accumulation chain drives the carrying cart to the designated processing position, the workpiece needs to stay at each processing position for a period of time to complete the designated processing. Therefore, the control center of the assembly line needs to know whether the workpiece has reached the designated position and detect the residence time.

[0003] In the control of the trolley group of the drying furnace and the curing furnace, the acquisition cost and reliability of the induction signal during transportation have always been a difficulty due to the high temperature inside the furnace. In the traditional way, a high-temperature sensor is placed in the furnace to detect the trolley. However, the cost of the high-temperature sensor is relatively high, and the service life is also short in a high-temperature environment for a long time. The flap-type high-temperature switch bracket device is prone to deformation of the induction plate, resulting in frequent truck chain jams, and there is a problem of limited installation space and inconvenient installation. Summary of the invention

[0004] In view of the technical problem that the temperature inside the above-mentioned drying furnace and curing furnace is relatively high and the monitoring sensors that can adapt to the high temperature environment are expensive and have a high failure rate, the purpose of the present invention is to provide a high-temperature furnace that can realize low-cost and high-reliability load-bearing trolley detection.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature furnace of an accumulation and release chain coating line, the coating line having an accumulation and release chain conveying system, the accumulation and release chain conveying system comprising a load-bearing track passing through the high-temperature furnace, a load-bearing trolley for loading workpieces and an accumulation and release chain for driving the load-bearing trolley to move along the load-bearing track, the high-temperature furnace having a furnace body and a furnace cavity, the high-temperature furnace being provided with a stop monitoring device for sending a first signal when the load-bearing trolley arrives at a specified position in the furnace cavity, the stop monitoring device comprising: a high-temperature transmission unit installed in the furnace cavity of the high-temperature furnace and a low-temperature alarm unit installed outside the furnace body, the high-temperature transmission unit comprising an in-furnace mounting seat relatively fixed to the load-bearing track, a movable connecting member A push plate connected to the in-furnace mounting seat and a traction member with one end fixed on the push plate, the low-temperature alarm unit includes an out-of-furnace mounting seat fixedly mounted on the furnace body, a counterweight connected to the other end of the traction member, and a first sensor for detecting the position of the counterweight, the push plate is at least partially located on the moving path of the carrying trolley, and the push plate has a first position in a natural state and a second position in contact with the carrying trolley and limited by the carrying trolley, the counterweight has a third position corresponding to the first position of the push plate and a fourth position corresponding to the second position of the push plate, and the first sensor is configured to send the first signal to the outside when it detects that the counterweight is located at the fourth position.

[0006] The present application uses a push plate along the running direction of the carrying trolley assembly to sense the position of the carrying trolley. When the carrying trolley enters the designated position in the high-temperature furnace, the push plate is pushed up by the assembly, and the mechanical motion signal is transmitted to the low-temperature zone outside the high-temperature furnace through the traction part. A low-cost sensor is used to detect the movement of the assembly in the furnace, thereby achieving the purpose of reducing costs and improving reliability.

[0007] In one embodiment of the present application, the low temperature alarm unit further includes a second sensor, which is fixedly mounted on the external mounting base of the furnace and is capable of monitoring whether the counterweight is located at the third position.

[0008] In one embodiment of the present application, the rear portion of the push plate is rotatably connected to the in-furnace mounting seat, and the push plate includes a front area and a rear area respectively located on the front and rear sides of the rotation center of the push plate, the center of gravity of the push plate is located on the front area, and the front area is at least partially located on the moving path of the carrying trolley and is configured to be lifted by the carrying trolley when in contact with the carrying trolley.

[0009] In one embodiment of the present application, the push plate also includes a tension spring, and both side ends of the tension spring are respectively fixedly connected to the in-furnace mounting seat and the rear area to provide an upward force or a force with an upward component to the rear area.

[0010] In one embodiment of the present application, the first sensor includes one of a visual identifier, a Hall sensor, and an infrared sensor.

[0011] In one embodiment of the present application, the first sensor is a displacement sensor, which includes a displacement seat and a displacement ruler slidably matched with the displacement seat, the displacement seat can identify the displacement amount of the displacement ruler, and the displacement ruler is fixedly connected to the counterweight.

[0012] In one embodiment of the present application, the stop monitoring device further includes a U-shaped pallet, which is clamped to the outer wall of the load-bearing rail and connected to the lower bolts of the load-bearing rail, and the in-furnace mounting base is bolted to the outer wall of the U-shaped pallet.

[0013] In one embodiment of the present application, a first pulley and a second pulley are fixedly installed in the furnace body, a third pulley is fixedly installed on the mounting seat outside the furnace, and the traction member successively passes around the first pulley, the second pulley and the third pulley.

[0014] In one embodiment of the present application, the push plate is in a boat shape, and the lower bottom surface of the push plate has a horizontal plane and a front slope surface and a rear slope surface respectively connected to the front and rear of the horizontal plane.

[0015] Compared with the prior art, the stop monitoring device provided by the technical solution of the present invention can feedback whether there is a trolley staying at the push plate and the length of time the trolley stays by checking whether the counterweight is in the fourth position and the length of time the trolley stays at the fourth position. The counterweight and the first sensor for monitoring the position of the counterweight are arranged on an external furnace mounting seat away from the load rail. The temperature at the external furnace mounting seat is relatively low, so the first sensor can be a normal temperature sensor with a relatively low price and high reliability, thereby reducing the cost of the coating line and improving its reliability and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The main view of the accumulation and release chain conveying system provided by the present invention Figure 1 ; Figure 2 for Figure 1 Front view of the power and free chain conveyor system shown Figure 2 ; Among them, the figure shows multiple hanging parts areas; Figure 3The main view of the stop monitoring device provided by the present invention Figure 1 ;Wherein, the push plate is located at the first position; Figure 4 for Figure 3 The main view of the stop monitoring device shown Figure 2 ; Wherein, the push plate is located at the second position; Figure 5 for Figure 3 A side view of the stop monitoring device shown; wherein the push plate is in the second position; Figure 6 It is a partial front view of another embodiment of a stop monitoring device.

[0017] Logo in the picture: 1. Traction rail; 2. Accumulation chain; 21. Pusher; 3. Carrying rail; 4. Furnace body; 5. Carrying trolley; 51. Front trolley; 52. Rear trolley; 53. Frame; 54. Lifting claw; 6. Hanging rack; 7. Stopper; 8. High temperature furnace; 10. Furnace mounting seat; 101. U-shaped card plate; 20. Push plate; 201. Front area; 202. Rear area; 203. Extension spring; 30, counterweight; 401, first pulley; 402, second pulley; 403, third pulley; 50. External furnace mounting base; 601. First sensor; 602. Second sensor; 70. Displacement sensor; 701. Displacement seat; 702. Displacement ruler. Implementation

[0018] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0019] In addition, in this application, spatial relative terms such as "below", "below", "above", "above", etc., are used to describe the relationship of one element to another (other) element as shown in the drawings. The spatial relative terms are intended to include different orientations of the device in use, operation and / or manufacture other than the orientation depicted in the drawings.

[0020] The present invention provides a high temperature furnace for a power-free chain coating line, which can be a drying furnace or a curing furnace on the coating line. The power-free chain coating line includes a power-free chain conveying system arranged along a running direction, such as Figure 1-2 As shown, the accumulation chain conveying system includes a traction track 1, an accumulation chain 2 running in the traction track 1, a carrying track 3 located at the lower side of the traction track 1, and a plurality of carrying trolleys 5 suspended on the carrying track 3. The traction track 1, the accumulation chain 2, and the carrying track 3 all extend along the running direction of the assembly line and pass through various processing positions of the assembly line in sequence. A plurality of downwardly protruding pushers 21 are arranged on the accumulation chain 2. When the lifting claws on the carrying trolley 5 are raised, they just dock with the pushers 21 on the accumulation chain 2, and are driven forward by the accumulation chain.

[0021] The load-bearing trolley can be divided into a single-carriage type and a multi-carriage type. The single-carriage type load-bearing trolley is composed of only one load-bearing trolley 5. Figure 1 The load-carrying trolley 5 includes a front trolley 51 and a rear trolley 52 arranged front and rear, and a frame 53 fixedly arranged at the lower side of the front and rear trolleys. A lift claw 54 is arranged on the front trolley 51, and the lift claw 54 can be mechanically docked with the push head 21 of the accumulation chain 2 in a natural state, so that the accumulation chain 2 drives the load-carrying trolley 5 to move along the transportation direction. The stopper 7 installed on the load-carrying track 3 can make the lift claw drop and disengage from the accumulation chain 2, so that the load-carrying trolley is accumulated at this position for processing. Similarly, when multiple load-carrying trolleys are accumulated in one place, the front and rear load-carrying trolleys contact and make the lift claw of the rear load-carrying trolley drop and disengage from the accumulation chain.

[0022] The multi-carriage type load-bearing trolley includes at least two load-bearing trolleys 5 arranged in sequence (two load-bearing trolleys 5 are shown in the drawings of the specification) and a hanger 6 fixedly arranged at the lower side of each load-bearing trolley 5. The specific number of the load-bearing trolleys 5 of the multi-carriage type load-bearing trolley is determined by factors such as the load demand during the actual transportation operation, the length of the hanger 6, and the path setting of the load-bearing track 3. Its structure is consistent with the load-bearing trolley 5 of the single-carriage type load-bearing trolley, and will not be described in detail here.

[0023] Figure 2 The figure shows the respective hanging parts areas Z1-Z3 of multiple carrying trolleys. It can be understood that for a multi-carrying trolley, multiple carrying trolleys can be operated simultaneously in the accumulation and release chain conveying system, and the workpieces carried by different carrying trolleys can be the same or different.

[0024] A plurality of stoppers 7 are arranged at intervals on the carrying track 3 , and the stoppers 7 can selectively disconnect the mechanical connection between the lifting claw 54 and the corresponding pusher head 21 to selectively release the carrying trolley or stop the carrying trolley on the carrying track 3 .

[0025] Combination Figure 3-5 , the accumulation and release chain conveying system passes through the high temperature furnace 8. A stop monitoring device for sending a first signal when the carrying trolley 5 reaches a specified position in the furnace cavity is provided at the high temperature furnace.

[0026] The stay monitoring device comprises: a high temperature transmission unit installed in the furnace chamber of the high temperature furnace 8 and a low temperature alarm unit installed outside the furnace body, the high temperature transmission unit comprises a furnace mounting seat 10 fixed relatively to the bearing rail, a push plate 20 movably connected to the furnace mounting seat 10, a first pulley 401, a second pulley 402 and a traction member with one end fixed to the push plate 20. In this embodiment, the traction member is a high temperature resistant steel wire rope. In other embodiments, the traction member can also be made of a rigid material that does not deform.

[0027] The low temperature alarm unit includes an external furnace mounting base 50 fixedly mounted on the furnace body 4 , a counterweight 30 connected to the other end of the traction member, and a first sensor 601 and a second sensor 602 for detecting the position of the counterweight 30 . The furnace mounting seat 10 is fixedly connected to the load-bearing rail 3 via a U-shaped clamping plate 101, and the U-shaped clamping plate 101 is clamped to the outer wall of the load-bearing rail 3 and fixedly connected to the lower part of the load-bearing rail 3 by bolts. The furnace mounting seat 10 is fixedly connected to the outer wall of the U-shaped clamping plate 101 by bolts, thereby reducing damage to the load-bearing rail 3 to maintain the structural strength of the load-bearing rail 3.

[0028] The furnace mounting seat 10 extends in the up-down direction and protrudes downward relative to the support rail 3. The push plate 20 extends in the front-back direction and is located at the lower side of the support rail 3, and can rotate around the connection between itself and the furnace mounting seat 10. The push plate 20 includes a front area 201 and a rear area 202 located at the front and rear sides of its rotation center (i.e., the connection between itself and the furnace mounting seat 10), respectively.

[0029] In order to make the push plate 20 be lifted more smoothly when it contacts the carrying trolley, the push plate 20 is in a boat shape, and the lower bottom surface of the push plate 20 has a horizontal surface and a front slope surface connected to the front of the horizontal surface and a rear slope surface connected to the rear of the horizontal surface. The push plate 20 is configured so that its center of gravity is located on the front area 201, so that the push plate 20 is in a first position in which the front area 201 is tilted downward relative to the rear area 202 in a natural state (see Figure 3When the push plate 20 is in the first position, at least part of its front area 201 is located on the moving path of the carrier. When any of the carrier trolleys 5 of the carrier trolley contacts the push plate 20, the front area 201 can be lifted and the push plate 20 is in a second position different from the first position (see Figure 4 ). Thus, by monitoring the specific position (including the first position and the second position) of the push plate 20 and the length of time it is at the position, it can be determined whether there is a carrying trolley at its installation location and the length of time the device stays there.

[0030] It should be noted that in other embodiments, the center of gravity of the push plate can also be set on the rear area. Under the premise that the push plate has a first position in a natural state and a second position in contact with the carrying trolley and limited by the carrying trolley, the specific structure of the push plate and the relative relationship between the first position and the second position do not limit the protection scope of the present invention.

[0031] Furthermore, a tension spring 203 is arranged on the push plate 20, and the two ends of the tension spring 203 are respectively fixedly connected to the furnace mounting seat 10 and the rear area 202 of the push plate 20. The tension spring 203 is in a tensioned state and always provides an upward force or an upward force component to the rear area 202 of the push plate 20, so as to ensure that the push plate 20 can overcome the gravity of the counterweight 30 (see below for details) and maintain the first position when it is in a natural state.

[0032] The pulley block includes a first pulley 401 and a second pulley 402 rotatably mounted on the bearing rail 3 and arranged front and back, and a third pulley 403 rotatably mounted on an external furnace mounting seat 50. The external furnace mounting seat 50 is fixedly arranged on the top of the furnace body 4 to be away from the bearing rail 3.

[0033] The counterweight 30 is linearly connected to the front region 201 of the push plate 20 via a steel wire rope (not shown in the figure), and the upper end of the steel wire rope passes through the first pulley 401, the second pulley 402, and the third pulley 403 in sequence to connect with the counterweight 30. The counterweight 30 is suspended on the external mounting seat 50 via the third pulley 403 in a manner that it can be lifted and lowered, and has a third position corresponding to the first position of the push plate 20 and a fourth position corresponding to the second position of the push plate 20. In other embodiments, the steel wire rope may also be fixedly connected to the rear region of the push plate; the pulley block may also be arranged with other numbers of pulleys or pulleys located at other positions. Under the premise that the counterweight is linearly connected to the push plate and the counterweight has a third position corresponding to the first position of the push plate and a fourth position corresponding to the second position of the push plate, the specific connection position of the steel wire rope and the number and arrangement of the pulleys do not limit the protection scope of the present invention.

[0034] The first sensor 601 is fixedly disposed on the furnace outer mounting base 50 and faces the fourth position of the counterweight 30. The first sensor 601 is configured to monitor whether the counterweight 30 is located at the fourth position and the duration of the counterweight 30 being located at the fourth position. The first sensor 601 may be an infrared sensor, a visual identifier, a Hall sensor, or the like.

[0035] Furthermore, the present embodiment is also provided with a second sensor 602 fixedly mounted on the mounting base 50 outside the furnace and facing the third position of the counterweight 30. The second sensor 602 is configured to send a second signal to the outside when the counterweight 30 is in the third position. Similarly, the second sensor 602 may be an infrared sensor, a visual identifier or a Hall sensor, etc. The painting assembly line can determine whether the carrying trolley has reached the designated position in the high-temperature furnace through the first and second sensors, and calculate the residence time of the carrying trolley in the high-temperature furnace through the feedback time of the first signal and the second signal. The residence monitoring device can also detect whether there are faults such as broken wire ropes, falling of the counterweight 30, and jamming of the push plate 20 in the high-temperature furnace (under such faults, the first and second sensors may not be able to detect the counterweight 30).

[0036] like Figure 6 As shown, it shows a second embodiment of the stop monitoring device provided by the present invention, and the stop monitoring device is only provided with a displacement sensor 70. The displacement sensor 70 includes a displacement seat 701 and a displacement ruler 702 that slidably cooperates with the displacement seat 701. The displacement ruler 702 is fixedly connected to the counterweight 30 and can be driven by the counterweight 30 to move up and down. The displacement seat 701 is configured to monitor the displacement of the displacement ruler 702 to monitor the specific position (including the third position and the fourth position) of the counterweight 30 and the length of stay at the position. Similarly, the coating line can also determine whether there is a fault in the stop monitoring device through the displacement sensor 70.

[0037] The present invention forms a mechanical transmission connection between the counterweight 30 and the push plate 20 and arranges the first and second sensors (or displacement sensors 70) on the furnace outside mounting seat 50 away from the load-bearing track 3, thereby monitoring whether there is a load-bearing trolley staying at the push plate 20 and the length of time the load-bearing trolley stays, so that the coating assembly line can control the stopper 7 in the high-temperature furnace to selectively stop the load-bearing trolley carrying the workpiece to be dried and release the load-bearing trolley whose stay time (i.e., the length of time the workpiece stays in the high-temperature furnace 8) reaches the preset requirements, thereby realizing automatic operation.

[0038] Since the external furnace mounting seat 50 is far away from the supporting rail 3 and the high temperature environment in the furnace, its ambient temperature is relatively low, so the first and second sensors (or displacement sensors 70) can use normal temperature sensors with lower cost and lower failure rate, thereby reducing the cost of the coating line and improving the reliability and production efficiency of the coating line.

[0039] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A high-temperature furnace of a power-free chain coating line, the coating line having a power-free chain conveying system, the power-free chain conveying system comprising a carrying track passing through the high-temperature furnace, a carrying trolley for loading workpieces, and a power-free chain for driving the carrying trolley to move along the carrying track, the high-temperature furnace having a furnace body and a furnace cavity, It is characterized in that The high-temperature furnace is provided with a stop monitoring device for sending a first signal when the carrying trolley reaches a specified position in the furnace cavity, the stop monitoring device includes: a high-temperature transmission unit installed in the furnace cavity of the high-temperature furnace and a low-temperature alarm unit installed outside the furnace body, the high-temperature transmission unit includes an in-furnace mounting seat fixed relatively to the carrying rail, a push plate movably connected to the in-furnace mounting seat and a traction member with one end fixed on the push plate, the low-temperature alarm unit includes an out-of-furnace mounting seat fixedly installed on the furnace body, a counterweight connected to the other end of the traction member, and a first sensor for detecting the position of the counterweight, the push plate is at least partially located on the moving path of the carrying trolley, and the push plate has a first position in a natural state and a second position in contact with the carrying trolley and limited by the carrying trolley, the counterweight has a third position corresponding to the first position of the push plate and a fourth position corresponding to the second position of the push plate, and the first sensor is configured to send the first signal to the outside when it is detected that the counterweight is located at the fourth position.

2. The high temperature furnace according to claim 1, It is characterized in that The low temperature alarm unit also includes a second sensor, which is fixedly mounted on the external mounting seat of the furnace and can monitor whether the counterweight is located at the third position.

3. The high temperature furnace according to claim 1, It is characterized in that The rear portion of the push plate is rotationally connected to the in-furnace mounting seat, and the push plate includes a front area and a rear area respectively located on the front and rear sides of the rotation center of the push plate, the center of gravity of the push plate is located on the front area, and the front area is at least partially located on the moving path of the carrying trolley and is configured to be lifted by the carrying trolley when in contact with the carrying trolley.

4. The high temperature furnace according to claim 3, It is characterized in that The push plate also includes a tension spring, and the two side ends of the tension spring are respectively fixedly connected to the furnace mounting seat and the rear area to provide an upward force or an upward component force to the rear area.

5. The high temperature furnace according to claim 1, It is characterized in that The first sensor includes one of a visual identifier, a Hall sensor and an infrared sensor.

6. The high temperature furnace according to claim 1, It is characterized in that The first sensor is a displacement sensor, which includes a displacement seat and a displacement ruler slidably matched with the displacement seat. The displacement seat can identify the displacement of the displacement ruler, and the displacement ruler is fixedly connected to the counterweight.

7. The high temperature furnace according to claim 1, It is characterized in that The stop monitoring device also includes a U-shaped card plate, which is clamped on the outer wall of the load-bearing track and connected to the lower bolt of the load-bearing track, and the in-furnace mounting seat is bolted to the outer wall of the U-shaped card plate.

8. The high temperature furnace according to claim 1, It is characterized in that A first pulley and a second pulley are fixedly installed in the furnace body, a third pulley is fixedly installed on the mounting seat outside the furnace, and the traction member successively passes around the first pulley, the second pulley and the third pulley.

9. The high temperature furnace according to claim 1, It is characterized in that The push plate is in a boat shape, and the lower bottom surface of the push plate comprises a horizontal surface and a front slope surface and a rear slope surface respectively connected to the front and rear of the horizontal surface.

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