Workpiece material level detection device of multi-channel furnace body

Abstract

A workpiece material level detection device of a multi-channel furnace body comprises two bearing seats, a rotating shaft, a plurality of detection rods, a plurality of first swing arms, a second swing arm, a telescopic driving unit, three touch parts, three stroke detection switches and a control unit, a plurality of detection holes are formed in the side wall of the multi-channel furnace body, and the detection rods are inserted into the detection holes. The two bearing seats are arranged on two sides of the plurality of detection holes, the rotating shaft penetrates through the two bearing seats, one end of the detection rod is adjacent to a workpiece material position, the other end of the detection rod is connected with the rotating shaft through a first swing arm, the telescopic driving unit is arranged on the side wall, the telescopic end of the telescopic driving unit is connected with the rotating shaft through a second swing arm, and the rotating shaft is sleeved with the three touch portions. The stroke detection switches are arranged on the outer side of the multi-channel furnace body corresponding to the touch parts, and touch detection distances exist between the stroke detection switches and the corresponding touch parts. The control unit is arranged on the outer side of the multi-channel furnace body and electrically connected with the telescopic driving unit and the stroke detection switches. Therefore, the structure of the device can be simplified, the application of driving parts is reduced, and the manufacturing and operating cost is reduced.

Description

Technical Field

[0001] This utility model relates to workpiece material level detection technology, and in particular to a workpiece material level detection device for a multi-channel furnace body. Background Technology

[0002] With the rapid development of the equipment manufacturing industry, multi-channel furnace structures have been successively developed and manufactured, including multi-channel heating furnaces, tempering furnaces, and carburizing furnaces. Workpiece level detection devices are essential sensing and control components for various types of furnaces, used to detect the workpiece conveying position and control the orderly conduct of the workpiece heat treatment process. However, existing multi-channel furnaces still use structurally independent single-channel level detection devices, and multiple single-channel level detection devices are necessary to detect the workpiece level in each channel, thus increasing both manufacturing and operating costs. Therefore, developing a workpiece level detection device with a simplified structure and some shared components, specifically designed for multi-channel furnaces to reduce manufacturing and operating costs, has become one of the urgent technical problems to be solved in this field. Utility Model Content

[0003] The technical problem this solution aims to solve is how to provide a workpiece level detection device with a simplified structure and some components that can be shared, specifically suitable for multi-channel furnaces, in order to reduce manufacturing and operating costs.

[0004] To address the aforementioned technical problems, this technical solution provides a workpiece level detection device for a multi-channel furnace, used to detect the position of workpieces at different workpiece levels within different channels of the multi-channel furnace. The device includes: two bearing seats, a rotating shaft, multiple detection rods, multiple first swing arms, a second swing arm, a telescopic drive unit, three contact parts, three stroke detection switches, and a control unit. Multiple detection holes are provided on the sidewalls of adjacent workpiece levels within the multi-channel furnace, corresponding to each workpiece level. The two bearing seats are fixedly mounted on the outer surfaces of the sidewalls of the multi-channel furnace on either side of the multiple detection holes. The rotating shaft is rotatably inserted through the two bearing seats. The multiple detection rods are inserted into the multiple detection holes, with one end of each detection rod facing and adjacent to the workpiece level, and the other end of each detection rod hinged to one end of a first swing arm. The other end of the first swing arm is fixedly sleeved on the rotating shaft, and one end of the second swing arm is fixedly sleeved on the rotating shaft. The telescopic drive unit is fixedly installed on the outer side surface of the side wall of the multi-channel furnace body with detection holes. The telescopic end of the telescopic drive unit is hinged to the other end of the second swing arm. The three contact parts are fixedly sleeved on the rotating shaft with a gap between them. The three stroke detection switches are set on the outside of the multi-channel furnace body corresponding to the three contact parts, and each contact part has a different contact detection distance from the corresponding stroke detection switch. The control unit is set on the outside of the multi-channel furnace body and is electrically connected to the telescopic drive unit and the three stroke detection switches respectively. The control unit detects the workpiece position on the workpiece level in different channels and controls the telescopic drive unit to reset by receiving the signals generated by each contact part touching the corresponding stroke detection switch. Accordingly, the workpiece level detection device of this technical solution can link multiple detection rods to detect the workpiece position on the workpiece level in multiple channels by setting only one rotating shaft, one telescopic drive unit and three stroke detection switches. It can also realize the reset detection of each detection rod, the detection of the workpiece reaching the designated position in each channel and the detection of the workpiece exceeding the position. Compared with the existing structure of using multiple single-channel level detection devices in multi-channel furnaces, it can save the number of telescopic drive units, stroke detection switches and related supporting components, greatly simplifying the overall structure of the workpiece level detection device. It can also reduce the failure rate and maintenance difficulty of the workpiece level detection device, thereby reducing manufacturing and operating costs.

[0005] As another implementation of this technical solution, the other end of the detection rod has a horizontal through hole. The first swing arm is composed of a fixed sleeve, two first strip plates, and a first connecting pin. A fixing key is provided on the side wall of the rotating shaft. A fixing groove is recessed on the inner side wall of the fixed sleeve corresponding to the fixing key. The fixed sleeve is fixedly fitted onto the rotating shaft by aligning its fixing groove with the fixing key. The two first strip plates are parallel, with their surfaces facing each other and spaced apart, and perpendicular to the axial direction of the fixed sleeve. One end of each of the two first strip plates is fixedly attached to the side wall of the fixed sleeve, and the other ends of the two first strip plates have through holes aligned with each other. The detection rod is hinged through the through holes of the two first strip plates, allowing circumferential rotation, via the first connecting pin. This strengthens the structural strength of the first swing arm and facilitates its disassembly and maintenance.

[0006] In another implementation of this technical solution, one end of the rotating shaft extends beyond the bearing seat to form an actuating segment. The second swing arm is composed of a second strip plate and a second connecting pin. A fixing key is also present on the side wall of the actuating segment. One end of the second strip plate has a fitting hole with a recessed groove at its edge. The second strip plate is fixedly fitted onto the actuating segment by aligning its groove with the fixing key of the actuating segment. The other end of the second strip plate has a hole, and the end of the telescopic drive unit has a connecting hole. The second strip plate is hinged through its hole, aligning with the connecting hole of the telescopic drive unit, and is rotatably connected via the second connecting pin. Therefore, placing the telescopic drive unit in a separate area facilitates its repair and maintenance.

[0007] In another embodiment of this technical solution, the three contact parts are fixedly sleeved on the actuating section. Each contact part has a contact block, and the travel detection switch has electrical contacts. On the radial plane of the rotating shaft, there is a gap between the projections of each contact block, while the projections of each electrical contact coincide; or the projections of each contact block coincide, while there is a gap between the projections of each electrical contact; or there are gaps between both the projections of each contact block and the projections of each electrical contact. Therefore, placing the contact parts and the travel detection switch in an independent area facilitates their repair and maintenance.

[0008] As another implementation of this technical solution, the workpiece level detection device further includes: multiple high-temperature resistant sealing rings, the diameter of the detection hole being larger than the diameter of the detection rod, each high-temperature resistant sealing ring being fixedly installed on its respective detection hole, and the detection rod being inserted into the high-temperature resistant sealing ring. This effectively prevents the internal environment of the multi-channel furnace from communicating with the outside world to avoid dangerous accidents, and also allows the detection rod to undergo a slight radial offset during operation.

[0009] As another implementation of this technical solution, the workpiece level detection device further includes: multiple sealing covers, each a rectangular shell. Each sealing cover has an opening on one side wall corresponding to the first swing arm, and shaft holes are formed on opposite side walls corresponding to the rotating shaft, with sealed bearings installed within these shaft holes. The sealing cover houses the first swing arm through the opening, and is fixedly attached to the side wall of the multi-channel furnace. The shaft holes on both sides of the sealing cover allow the rotating shaft to rotate circumferentially, sealing the area within the sealed bearings. This further prevents communication between the internal environment of the multi-channel furnace and the external environment, thus avoiding dangerous accidents.

[0010] As another implementation of this technical solution, the workpiece level detection device further includes: a fixing frame, which is composed of a U-shaped channel steel section and two angled steel plates. The U-shaped channel steel section is positioned below the telescopic drive unit with its groove facing upwards, and one end of the U-shaped channel steel section is fixedly connected to the outer side of the side wall of the multi-channel furnace body. The two angled steel plates are both vertically positioned, and their opposite sides and the edges away from the telescopic drive unit are fixedly connected to the two sides of the U-shaped channel steel section and the side wall of the multi-channel furnace body, respectively. The telescopic drive unit is positioned with its telescopic end facing upwards, and the lower end of the cylinder end of the telescopic drive unit is fixedly located in the groove of the U-shaped channel steel section. Accordingly, the telescopic drive unit can be securely installed on the outer side of the side wall of the multi-channel furnace body.

[0011] As another implementation of this technical solution, the telescopic drive unit can be a pneumatic telescopic cylinder, a hydraulic telescopic cylinder, or an electric telescopic cylinder.

[0012] As another implementation of this technical solution, the multiple detection holes are opened at the same height, and the two bearing seats are also set at the same height.

[0013] As another implementation of this technical solution, the control unit is composed of a programmable logic control circuit or a microcontroller circuit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a workpiece level detection device for a multi-channel furnace body according to the present invention;

[0015] Figure 2 This is a side sectional view of a workpiece level detection device for a multi-channel furnace body according to the present invention;

[0016] Figure 3 A schematic diagram of an embodiment in which the contact part and the travel detection switch are arranged with the radial plane of the rotating shaft as a reference plane;

[0017] Figure 4 A schematic diagram of another embodiment in which the contact part and the travel detection switch are arranged with the radial plane of the rotating shaft as a reference plane;

[0018] Figure 5 This is a schematic diagram of another embodiment in which the contact part and the travel detection switch are arranged with the radial plane of the rotating shaft as a reference plane.

[0019] Explanation of symbols in the attached diagram:

[0020] 10 Bearing housing; 1 Rotating shaft; 11 Fixing key; 12 Actuating section; 2 Detection rod; 3 First swing arm; 31 Fixing sleeve; 311 Fixing groove; 32 First strip plate; 33 First connecting pin; 4 Second swing arm; 41 Second strip plate; 42 Second connecting pin; 5 Telescopic drive unit; 6 Contact part; 61 Contact block; 7 Stroke detection switch; 71 Electrical contact; 8 Sealing cover; 91 U-shaped channel steel section; 92 Angle steel plate; A Detection hole. Detailed Implementation

[0021] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0022] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0023] like Figure 1 and Figure 2 The diagram shown is a schematic representation of a specific embodiment of a workpiece level detection device for a multi-channel furnace body according to this utility model. This workpiece level detection device (hereinafter referred to as the workpiece level detection device) is used to detect the position of workpieces in different channels of a multi-channel furnace body (not shown in the diagram). The multi-channel furnace body can be a multi-channel heating furnace, a multi-channel tempering furnace, or a multi-channel carburizing furnace, etc. This utility model does not limit the type of furnace to which the workpiece level detection device is applicable.

[0024] The workpiece level detection device of this embodiment includes two bearing seats 10, a rotating shaft 1, multiple detection rods 2, multiple first swing arms 3, second swing arms 4, a telescopic drive unit 5, three contact parts 6, three stroke detection switches 7, and a control unit (not shown in the figure). Multiple detection holes A are provided on the side walls of the workpiece levels in adjacent channels of the multi-channel furnace body, corresponding to each workpiece level. The two bearing seats 10 are respectively fixedly installed on the outer side surfaces of the side walls of the multi-channel furnace body on both sides of the multiple detection holes A. The rotating shaft 1 is rotatably inserted through the two bearing seats 10. The multiple detection rods 2 are respectively inserted into the multiple detection holes A. One end of the detection rod 2 faces and is adjacent to the workpiece level, and the other end of the detection rod 2 is hinged to one end of the first swing arm 3. The other end of the first swing arm 3 is fixedly sleeved on the rotating shaft 1. One end of the swing arm 4 is fixedly sleeved on the rotating shaft 1. The telescopic drive unit 5 is fixedly installed on the outer side surface of the side wall of the multi-channel furnace body with the detection hole A. The telescopic end of the telescopic drive unit 5 is hinged to the other end of the second swing arm 4. The three contact parts 6 are fixedly sleeved on the rotating shaft 1 with a gap between them. The three stroke detection switches 7 are set on the outer side of the multi-channel furnace body corresponding to the three contact parts 6. Each contact part 6 has a different contact detection distance from its corresponding stroke detection switch 7. The control unit is set on the outer side of the multi-channel furnace body and is electrically connected to the telescopic drive unit 5 and the three stroke detection switches 7 respectively. The control unit detects the workpiece position on the workpiece level in different channels and controls the telescopic drive unit 5 to reset by receiving the signal generated by each contact part 6 touching the corresponding stroke detection switch 7. It should be noted that in a multi-channel furnace, the multiple channels (furnace cavities) do not perform heat treatment operations simultaneously. Typically, only one channel performs the workpiece heat treatment according to its specific process parameters. In other words, each channel has different process parameters. During heat treatment, the workpiece is sent to the corresponding channel based on the required process parameters. For example, in a multi-channel carburizing furnace, the multiple channels are used to perform operations with different carburizing depths. During carburizing, the workpiece is sent to the corresponding channel that requires that depth. The workpiece level detection device in this solution can detect the workpiece position in each channel individually, and can only detect the workpiece level in that channel during each channel's operating period.

[0025] Specifically, in this embodiment, the other end of the detection rod 2 has a horizontal through hole (not shown in the figure). The first swing arm 3 is composed of a fixed sleeve 31, two first strip plates 32, and a first connecting pin 33. The side wall of the rotating shaft 1 has a fixing key 11. The inner side wall of the fixed sleeve 31 is recessed with a fixing groove 311 corresponding to the fixing key 11. The fixed sleeve 31 is fixedly sleeved on the rotating shaft 1 by aligning and fitting its fixing groove 311 with the fixing key 11. The two first strip plates 32 are flat. The two first strip plates 32 are arranged with their surfaces facing each other and spaced apart, and are perpendicular to the axis of the fixed sleeve 31. One end of each first strip plate 32 is fixedly attached to the side wall of the fixed sleeve 31. The other ends of the two first strip plates 32 are provided with through holes (not shown in the figure). The detection rod 2 is aligned with the through holes of the two first strip plates 32 and is hinged through the first connecting pin 33, which can rotate circumferentially. This strengthens the structural strength of the first swing arm 3 and facilitates the disassembly and maintenance of the first swing arm 3.

[0026] In this embodiment, one end of the rotating shaft 1 extends through the bearing seat 10 and extends a distance to form an actuating segment 12. The second swing arm 4 is composed of a second strip plate 41 and a second connecting pin 42. The side wall of the actuating segment 12 also has a fixing key (not shown in the figure). One end of the second strip plate 41 is provided with a sleeve hole (not shown in the figure), and the edge of the sleeve hole is recessed with a groove. The second strip plate 41 is fixedly sleeved on the actuating segment 12 by aligning and fitting its groove with the fixing key of the actuating segment 12. The other end of the second strip plate 41 is provided with a hole (not shown in the figure). The end of the telescopic drive unit 5 is provided with a connecting hole (not shown in the figure). The second strip plate 41 is aligned with the connecting hole of the telescopic drive unit 5 by aligning its hole with the connecting hole of the telescopic drive unit 5 and is rotatably hinged through the second connecting pin 42. Thus, the telescopic drive unit 5 and the second swing arm 4 can be set in an independent area for easy maintenance and repair. Additionally, the three contact parts 6 can also be fixedly sleeved on the actuating section 12. Each contact part 6 has a contact block 61, and the stroke detection switch 7 has an electrical contact 71. This electrical contact 71 typically consists of a fixed stationary contact (not shown) and a movable contact (not shown). When the contact block 61 contacts the movable contact and moves to contact the stationary contact, the stroke detection switch 7 generates a sensing signal and sends it to the control unit. In this embodiment, the three stroke detection switches 7 are classified according to the type of detection signal: a reset detection switch for detecting the resetting of the telescopic drive unit 5, an arrival detection switch for detecting the workpiece reaching a designated position on the workpiece level, and an overshoot detection switch for detecting the workpiece exceeding a designated position. Regarding the position setting of the three stroke detection switches 7 and the three contact parts 6, this embodiment arranges them using the radial plane of the reference shaft 1, combined with… Figures 3 to 5 As shown, the radial plane of shaft 1 (i.e., the plane containing the transverse section of the shaft) is used as the reference plane, as follows: Figure 3As shown, there is a gap between the projections of each contact block 61, while the projections of each electrical contact 71 coincide; or as... Figure 4 As shown, the projections of each contact block 61 coincide, while the projections of each electrical contact 71 are spaced apart; or as... Figure 5 As shown, there are gaps between the projections of each contact block 61 and between the projections of each electrical contact 71. This embodiment does not limit the arrangement of each contact block 61 and each electrical contact 71. Based on the structure of this solution, any arrangement in which the contact block 61 touches the corresponding electrical contact 71 to detect the corresponding signal can be applied to this solution and is considered as part of the protection of this solution. During the workpiece position detection process, when the telescopic drive unit 5's telescopic end drives the rotating shaft 1 to rotate (e.g., counterclockwise) via the second swing arm 4, causing one of the contact blocks 61 to touch its corresponding reset detection switch, the control unit immediately stops the telescopic drive unit 5 from resetting. At this time, the telescopic drive unit 5 has completed its reset, and the detection rod 2 reaches the position to be detected. When a workpiece in one of the channels reaches the designated position of the workpiece material level, it will touch the detection rod 2, causing it to drive the rotating shaft 1 to rotate (e.g., clockwise). At this time, another contact block 61 touches its corresponding position detection switch, and the control unit determines that the workpiece at the workpiece material level in that channel has reached the designated position. When a workpiece in one of the channels reaches the designated position of the workpiece material level and then continues to move a certain distance, the other contact block 61 will first touch its corresponding position detection switch, and then another contact block 61 will touch its corresponding overshoot detection switch within a subsequent time (the time set for detecting workpiece overshoot). At this time, the control unit determines that the workpiece at the workpiece material level in that channel has overshot the designated position. To enable the control unit to make corresponding state judgments and related controls based on the received signals, the control unit (not shown in the figure) in this embodiment can be composed of a programmable logic controller (PLC) or a microcontroller (MCU). Using such simple and technologically mature automation control circuits not only reduces the cost of the workpiece level detection device but also facilitates the detection and control of the workpiece level detection device. Given that the application of programmable logic controllers or microcontrollers to control the operating state of various components (such as resetting the telescopic drive unit) according to set instructions and sensor detection data (such as the sensing signal of the travel detection switch) has long been a widely used and common control mode in the field of automation control, and is the existing control technology, the process of the control unit judging the workpiece position and controlling the resetting of the telescopic drive unit in this invention will not be described in detail. Furthermore, the control unit and travel detection switch can be mounted on the outer side of the side wall of the multi-channel furnace body using fasteners for easy installation, removal, and maintenance. However, the control unit can also be installed outside the multi-channel furnace body or used as a control unit in the heat treatment production line to perform judgments and controls.

[0027] In this embodiment, the workpiece level detection device may further include multiple high-temperature resistant sealing rings (not shown in the figure). Since the hinge between the first swing arm 3 and the detection rod 2 moves along a short arc path during the rotation of the rotating shaft 1, the end of the detection rod 2 will experience a slight vertical displacement during its movement. This necessitates that the diameter of the detection hole A be slightly larger than the diameter of the detection rod 2. Fixing the high-temperature resistant sealing ring onto the detection hole A and inserting the detection rod 2 into the high-temperature resistant sealing ring not only prevents the detection rod 2 from colliding or rubbing against the detection hole A, but also produces a better sealing effect to prevent communication between the internal environment of the multi-channel furnace and the outside, thereby avoiding dangerous accidents. The high-temperature resistant sealing ring can be a high-temperature resistant silicone sealing ring. Since high-temperature resistant sealing rings are widely used in the heat treatment industry, they will not be described in detail here.

[0028] Furthermore, in order to improve the safety of the multi-channel furnace and further prevent the internal environment of the multi-channel furnace from communicating with the outside, the workpiece level detection device may also include multiple sealing covers 8, wherein the sealing cover 8 is in the shape of a rectangular shell, and the sealing cover 8 has an opening on one side wall corresponding to the first swing arm 3 (not shown in the figure). The sealing cover 8 has shaft holes on its opposite side walls corresponding to the rotating shaft 1 (not shown in the figure), and a sealing bearing (not shown in the figure) is provided in the shaft hole. The sealing cover 8 seals the first swing arm 3 inside through the opening, and the sealing cover 8 is fixedly connected to the side wall of the multi-channel furnace. The sealing cover 8 allows the rotating shaft 1 to rotate circumferentially through the shaft holes on both sides and is sealed in the sealing bearing.

[0029] In this embodiment, the workpiece level detection device may further include a fixing frame, which is composed of a U-shaped channel steel section 91 and two angled steel plates 92. The U-shaped channel steel section 91 is positioned below the telescopic drive unit 5 with its groove facing upwards, and one end of the U-shaped channel steel section 91 is fixedly connected to the outer side of the side wall of the multi-channel furnace body. The two angled steel plates 92 are both vertically arranged, and the opposite sides of the two angled steel plates 92 and the end edges away from the telescopic drive unit 5 are respectively fixedly connected to the two sides of the U-shaped channel steel section 91 and the side wall of the multi-channel furnace body. The telescopic drive unit 5 is positioned with its telescopic end facing upwards, and the lower end of the cylinder end of the telescopic drive unit 5 is fixedly located in the groove of the U-shaped channel steel section 91, thereby allowing the telescopic drive unit 5 to be stably installed on the outer side of the side wall of the multi-channel furnace body. The telescopic drive unit 5 may be a pneumatic telescopic cylinder, a hydraulic telescopic cylinder, or an electric telescopic cylinder. In addition, the opening height of the multiple detection holes A may be the same, and the setting height of the two bearing seats 10 may also be the same.

[0030] In summary, the workpiece level detection device of this utility model can detect the workpiece position on multiple detection rods in multiple channels of a multi-channel furnace by setting only one rotating shaft, one telescopic drive unit, and three stroke detection switches. It can also realize the reset detection of each detection rod, the detection of workpieces reaching designated positions in each channel, and the detection of workpieces exceeding their positions. Compared with the existing structure of using multiple single-channel level detection devices in a multi-channel furnace, it can save the number of telescopic drive units, stroke detection switches, and related supporting components, greatly simplifying the overall structure of the workpiece level detection device. It can also reduce the failure rate and maintenance difficulty of the workpiece level detection device, thereby reducing manufacturing and operating costs.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. A workpiece level detection device for a multi-channel furnace body, used to detect the position of the workpiece at different levels in different channels of the multi-channel furnace body, characterized in that, The workpiece level detection device includes: two bearing seats, a rotating shaft, multiple detection rods, multiple first swing arms, a second swing arm, a telescopic drive unit, three contact parts, three stroke detection switches, and a control unit. Multiple detection holes are provided on the side walls of the workpiece levels in adjacent channels of the multi-channel furnace body, corresponding to each workpiece level. The two bearing seats are respectively fixedly mounted on the outer side surfaces of the side walls of the multi-channel furnace body on both sides of the multiple detection holes. The rotating shaft is rotatably inserted through the two bearing seats. The multiple detection rods are respectively inserted into the multiple detection holes, with one end of each detection rod facing and adjacent to the workpiece level, and the other end of each detection rod hinged to one end of a first swing arm. The other end of the first swing arm is fixedly sleeved on the rotating shaft, and one end of the second swing arm is fixedly sleeved on the rotating shaft. The telescopic drive unit is fixedly mounted on the outer side surface of the side wall of the multi-channel furnace body with the detection hole. The telescopic end of the telescopic drive unit is hinged to the other end of the second swing arm. The three contact parts are fixedly sleeved on the rotating shaft with a gap between them. The three stroke detection switches are disposed on the outer side of the multi-channel furnace body corresponding to the three contact parts, and each contact part has a different contact detection distance from the corresponding stroke detection switch. The control unit is disposed on the outer side of the multi-channel furnace body and electrically connected to the telescopic drive unit and the three stroke detection switches respectively. The control unit detects the workpiece position on the workpiece level in different channels and controls the telescopic drive unit to reset by receiving the signals generated by each contact part touching the corresponding stroke detection switch.

2. The workpiece level detection device according to claim 1, characterized in that, The other end of the detection rod has a horizontal through hole. The first swing arm is composed of a fixed sleeve, two first strip plates and a first connecting pin. The side wall of the rotating shaft has a fixing key. The inner side wall of the fixed sleeve has a fixing groove corresponding to the fixing key. The fixed sleeve is fixedly sleeved on the rotating shaft by aligning and fitting its fixing groove with the fixing key. The two first strip plates are parallel and their surfaces face each other and are spaced apart and perpendicular to the axis of the fixed sleeve. One end of the two first strip plates is fixedly connected to the side wall of the fixed sleeve. The other ends of the two first strip plates have through holes aligned with each other. The detection rod is hinged by aligning its through hole with the through holes of the two first strip plates and can rotate circumferentially through the first connecting pin.

3. The workpiece level detection device according to claim 1, characterized in that, One end of the rotating shaft passes through the bearing seat and extends a distance to form an actuating segment. The second swing arm is composed of a second strip plate and a second connecting pin. The side wall of the actuating segment has a fixing key. One end of the second strip plate has a sleeve hole and the edge of the sleeve hole has a groove. The second strip plate is fixedly sleeved on the actuating segment by aligning and fitting its groove with the fixing key. The other end of the second strip plate has a hole. The end of the telescopic drive unit has a connecting hole. The second strip plate is hinged by aligning its hole with the connecting hole of the telescopic drive unit and can rotate circumferentially through the second connecting pin.

4. The workpiece level detection device according to claim 3, characterized in that, The three contact parts are fixedly sleeved on the actuating segment. Each contact part has a contact block, and the travel detection switch has electrical contacts. On the radial plane of the rotating shaft, there is a gap between the projections of each contact block, while the projections of each electrical contact coincide, or the projections of each contact block coincide, while there is a gap between the projections of each electrical contact, or there are gaps between both the projections of each contact block and the projections of each electrical contact.

5. The workpiece level detection device according to claim 1, characterized in that, Also includes: Multiple high-temperature resistant sealing rings are provided, the diameter of the detection hole is larger than the diameter of the detection rod, each of the high-temperature resistant sealing rings is fixedly installed on each of the detection holes, and the detection rod is inserted into the high-temperature resistant sealing ring.

6. The workpiece level detection device according to claim 5, characterized in that, Also includes: Multiple sealing covers are provided, each being a rectangular shell. Each sealing cover has an opening on one side wall corresponding to the first swing arm. Each sealing cover has shaft holes on its opposite side walls corresponding to the rotating shaft, and sealing bearings are installed in the shaft holes. The sealing cover seals the first swing arm inside through the opening. The sealing cover is fixedly attached to the side wall of the multi-channel furnace body. The sealing cover allows the rotating shaft to rotate circumferentially through the shaft holes on both sides, and the sealing cover is sealed within the sealing bearings.

7. The workpiece level detection device according to claim 1, characterized in that, It also includes: a fixing frame, which is composed of a U-shaped channel steel section and two angled steel plates. The U-shaped channel steel section is arranged below the telescopic drive unit with its groove facing upward, and one end of the U-shaped channel steel section is fixedly connected to the outer side of the side wall of the multi-channel furnace body. The two angled steel plates are both arranged vertically, and the opposite sides of the two angled steel plates and the end edges away from the telescopic drive unit are respectively fixedly connected to the two sides of the U-shaped channel steel section and the side wall of the multi-channel furnace body. The telescopic drive unit is arranged with its telescopic end facing upward, and the lower end of the cylinder end of the telescopic drive unit is fixedly arranged in the groove of the U-shaped channel steel section.

8. The workpiece level detection device according to claim 1, characterized in that, The telescopic drive unit is a pneumatic telescopic cylinder, a hydraulic telescopic cylinder, or an electric telescopic cylinder.

9. The workpiece level detection device according to claim 1, characterized in that, The multiple detection holes are opened at the same height, and the two bearing seats are also set at the same height.

10. The workpiece level detection device according to claim 1, characterized in that, The control unit is composed of a programmable logic control circuit or a microcontroller circuit.

Images