An encapsulation structure for a surface mount thermistor

Abstract

This utility model discloses an encapsulation structure for surface-mount thermistors, including a worktable. A curing component is disposed on the right side of the upper surface of the worktable, and a moving component is disposed between the worktable and the placement plate. By controlling a first servo motor to drive a first external threaded rod to reverse, the first external threaded rod can move multiple encapsulated thermistor blocks to the right through a moving seat, a supporting base plate, and a placement plate to the underside of a far-infrared electric heater for heating and curing. During this process, when the preset heating time is up, a countdown timer will sound an alarm to alert nearby personnel, allowing them to stop the far-infrared electric heater in time to prevent the thermistor blocks from being heated for too long. After heating and curing is completed, the first servo motor is controlled to drive the first external threaded rod to reverse again, allowing multiple thermistor blocks to be moved to the right from inside the protective cover, facilitating the transfer of multiple thermistor blocks by personnel. The operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of surface mount thermistor encapsulation technology, specifically to an encapsulation structure for a surface mount thermistor. Background Technology

[0002] A surface mount thermistor is an electronic component that utilizes temperature changes to cause changes in resistance. It is mainly used for temperature detection and temperature protection. During the manufacturing process of surface mount thermistors, an epoxy resin dispensing machine is used to coat the surface of the surface mount thermistor block with the required epoxy resin for encapsulation.

[0003] In the prior art, a surface mount thermistor encapsulation structure with the publication number "CN216562651U" is provided. It is equipped with a heating device connected to a curing chamber. The operator places the printed workpiece fixture into the placement compartment in the curing chamber for curing, which improves curing efficiency and saves processing time. It is fixed on a rotating disk by a fixed base. The male buckle on the workpiece fixture is connected to the female buckle on the fixed base, so that the workpiece fixture is locked on the fixed base, making the printing more stable.

[0004] However, the above technical solutions and existing technologies have the following drawbacks:

[0005] Although the encapsulation structure can heat and cure the printed surface mount thermistors, the process requires workers to place sets of fixtures into the placement compartments inside the curing chamber before multiple surface mount thermistors can be heated and cured. After curing, the fixtures in the placement compartments are removed one by one. This operation not only increases the labor intensity of the workers, but also has a relatively cumbersome operation procedure and is not very practical. Utility Model Content

[0006] The purpose of this invention is to provide an encapsulation structure for a surface-mount thermistor to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An encapsulation structure for surface-mount thermistors includes an epoxy resin dispensing machine body, a worktable, and a placement plate. The placement plate is placed on top of the worktable, and multiple thermistor blocks are placed on the upper surface of the placement plate. The epoxy resin dispensing machine body is positioned above the thermistor blocks. A moving component is provided between the worktable and the placement plate, and the moving component is used to move the placement plate left and right. A curing component is provided on the right side of the upper surface of the worktable, and the curing component is used to heat and cure the thermistor blocks coated and encapsulated by the epoxy resin dispensing machine body. An adjustment component is provided on the left side of the upper surface of the worktable, and the adjustment component is used to adjust the dispensing position and height of the epoxy resin dispensing machine body.

[0009] Preferably, the moving component includes a supporting base plate, a moving seat, a first servo motor, a first support plate, a first external threaded rod, and a second support plate. The first support plate is fixedly connected to the left side of the lower end face of the worktable, the first servo motor is installed on the left end face of the first support plate, the transmission end of the first servo motor is connected to the first external threaded rod, the second support plate is fixedly connected to the right side of the lower end face of the worktable, and the right end of the first external threaded rod is located inside the second support plate. The moving seat is threaded onto the annular side of the first external threaded rod, and the supporting base plate is provided on the upper end face of the moving seat.

[0010] Preferably, the curing assembly includes a far-infrared electric heater, a protective cover, a countdown timer, and a control switch. The protective cover is fixedly connected to the right side of the upper surface of the workbench. The far-infrared electric heater is installed on the upper side of the inner wall of the protective cover. The countdown timer is installed on the left side of the front surface of the protective cover, and the control switch is installed on the right side of the front surface of the protective cover.

[0011] Preferably, the adjustment assembly includes a support frame, a second servo motor, a second external threaded rod, a displacement block, a lifting electric actuator, and a connecting plate. The support frame is fixedly connected to the left side of the upper surface of the worktable. The second servo motor is installed on the upper side of the front surface of the support frame. The transmission end of the second servo motor is connected to the second external threaded rod. The displacement block is threaded on the annular side of the second external threaded rod. The lifting electric actuator is installed at the middle position of the lower end face of the displacement block. The connecting plate is installed on the lower end face of the lifting electric actuator. A limiting cavity is formed on the upper surface of the support frame, and the limiting cavity matches the displacement block.

[0012] Preferably, the upper surface of the worktable is provided with a limiting groove, and the limiting groove matches the movable seat; the upper surface of the supporting base plate is provided with a placement cavity, and the placement cavity matches the placement plate.

[0013] Preferably, the upper surface of the placement plate is provided with multiple placement grooves, and the placement grooves are matched with the thermistor blocks, and the side of the placement plate is provided with a moving latch groove.

[0014] Preferably, the area that can be heated by the far-infrared electric heater is larger than the area of ​​the upper surface of the placement plate, the input terminal of the control switch is electrically connected to an external power supply via a wire, and the output terminal of the control switch is electrically connected to the far-infrared electric heater via a wire.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. By controlling the first servo motor to drive the first external threaded rod to reverse, the first external threaded rod can move multiple encapsulated thermistor blocks to the right through the moving seat, supporting base plate and placement plate to the far-infrared electric heater inside the protective cover for subsequent heating and curing processes. Similarly, when the first servo motor is controlled to rotate forward, the supporting base plate can move multiple encapsulated thermistor blocks to the left through the placement plate, so as to adjust the lateral left and right positions of the thermistor blocks.

[0017] 2. By operating the far-infrared electric heater, the far-infrared electric heater can heat and cure multiple thermistor blocks below. During this process, when the preset heating time is up, the countdown timer will sound an alarm to remind the surrounding staff to stop the far-infrared electric heater in time, so as to avoid the thermistor blocks being heated for too long or too short a time, thereby ensuring the quality of the thermistor blocks being heated and cured.

[0018] 3. By controlling the second servo motor to drive the second external threaded rod to rotate forward or reverse, the second external threaded rod can drive the dispensing head in the epoxy resin dispensing machine body to move longitudinally back and forth through the displacement block, lifting electric push rod and connecting hanging plate to adjust its front and rear dispensing position. When the lifting electric push rod is controlled to extend or retract, the lifting electric push rod can drive the dispensing head in the epoxy resin dispensing machine body to rise and fall through the connecting hanging plate to adjust its dispensing height, thereby increasing the dispensing and encapsulation range of the epoxy resin dispensing machine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0020] Figure 2 This is a structural diagram of the moving component, adjusting component, and curing component in this utility model;

[0021] Figure 3 This is a structural diagram of the curing component in this utility model when heating and curing the thermistor block;

[0022] Figure 4 This is a structural diagram of the mobile component in this utility model;

[0023] Figure 5 This is a structural diagram of the placement plate in this utility model;

[0024] Figure 6 This is a structural diagram of the curing component in this utility model.

[0025] In the diagram: 1. Epoxy resin dispensing machine body; 2. Thermistor block; 3. Worktable; 4. Moving assembly; 41. Support base plate; 42. Moving seat; 43. First servo motor; 44. First support plate; 45. Limiting slot; 46. Placement cavity; 47. First external threaded rod; 48. Second support plate; 5. Placement plate; 51. Shelf groove; 52. Transfer slot; 6. Adjustment assembly; 61. Support frame; 62. Second servo motor; 63. Second external threaded rod; 64. Displacement block; 65. Lifting electric push rod; 66. Connecting hanging plate; 67. Limiting cavity; 7. Curing assembly; 71. Far-infrared electric heater; 72. Protective cover; 73. Countdown timer; 74. Control switch. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-6 This utility model provides a technical solution:

[0028] Example 1:

[0029] An encapsulation structure for surface-mount thermistors includes an epoxy resin dispensing machine body 1, a worktable 3, and a placement plate 5. The placement plate 5 is placed on top of the worktable 3, supporting multiple thermistor blocks 2. Multiple thermistor blocks 2 are placed on the upper surface of the placement plate 5. The thermistor blocks 2 are surface-mount thermistors. Since the internal structure and working principle of the thermistor blocks 2 are relatively mature technologies in the prior art, they will not be described in detail here. The epoxy resin dispensing machine body 1 is located above the thermistor blocks 2. The epoxy resin dispensing machine body 1 is electrically connected to an external control cabinet (not shown in the figure) via wires. When working, the epoxy resin dispensing machine body 1 can coat the upper surface of the thermistor blocks 2 below with epoxy resin for encapsulation, and the thickness of the encapsulated epoxy resin is 0.5mm. Since the internal structure and working principle of the epoxy resin dispensing machine body 1 are relatively mature technologies in the prior art, they will not be described in detail here.

[0030] The upper surface of the placement plate 5 is provided with multiple placement slots 51, and the placement slots 51 are matched with the thermistor blocks 2. The placement slots 51 can limit the thermistor blocks 2 and prevent the multiple thermistor blocks 2 placed on the upper surface of the placement plate 5 from bumping and shaking each other. The side of the placement plate 5 is provided with a moving buckle slot 52, which makes it convenient for staff to move the placement plate 5 by hand.

[0031] A moving component 4 is provided between the workbench 3 and the placement plate 5. The moving component 4 is used to move the placement plate 5 left and right so as to carry multiple thermistor blocks 2 for coating, encapsulation and heat curing. A curing component 7 is provided on the right side of the upper end face of the workbench 3. The curing component 7 is used to heat and cure the thermistor blocks 2 after they have been coated and encapsulated by the epoxy resin dispensing machine body 1. An adjustment component 6 is provided on the left side of the upper end face of the workbench 3. The adjustment component 6 is used to adjust the longitudinal dispensing position and dispensing height of the epoxy resin dispensing machine body 1 so that the epoxy resin dispensing machine body 1 can coat and encapsulate the multiple thermistor blocks 2 below.

[0032] The moving component 4 includes a supporting base plate 41, a moving seat 42, a first servo motor 43, a first support plate 44, a first external threaded rod 47, and a second support plate 48. The first support plate 44 is fixedly connected to the left side of the lower end face of the worktable 3. The first support plate 44 is connected to the worktable 3 by welding. The first support plate 44 can support the first servo motor 43. The first servo motor 43 is installed on the left end face of the first support plate 44. The first servo motor 43 is connected to an external servo motor controller (not shown in the figure) via a wire. The first servo motor 43 and the first external threaded rod 47 are connected by a coupling. Figure 4 (As shown in the figure), the first servo motor 43 can drive the first external threaded rod 47 to rotate. The transmission end of the first servo motor 43 is connected to the first external threaded rod 47. The lower side of the moving seat 42 is provided with a first internal threaded through hole (not shown in the figure), and the first internal threaded through hole is threaded with the first external threaded rod 47. When the first external threaded rod 47 rotates forward or backward, it can drive the moving seat 42 to move laterally left and right through the first internal threaded through hole.

[0033] A second support plate 48 is fixedly connected to the right side of the lower end face of the workbench 3, and the right end of the first external threaded rod 47 is located inside the second support plate 48. The second support plate 48 is connected to the workbench 3 by welding. The second support plate 48 can support and limit the right end of the first external threaded rod 47, thereby ensuring the stability of the first external threaded rod 47 in use. A movable seat 42 is installed on the annular side thread of the first external threaded rod 47. The movable seat 42 is connected to the supporting base plate 41 by welding. The movable seat 42 can support the supporting base plate 41. The upper end face of the movable seat 42 is provided with The workbench 3 has a supporting base plate 41 that supports the placement plate 5. A limiting groove 45 is provided on the upper surface of the workbench 3, and the limiting groove 45 matches the movable seat 42. The limiting groove 45 can limit and guide the movable seat 42 to prevent the movable seat 42 from shaking or shifting during use. A placement cavity 46 is provided on the upper surface of the supporting base plate 41, and the placement cavity 46 matches the placement plate 5. The placement cavity 46 can limit the placement plate 5 to prevent the placement plate 5 placed on the upper surface of the supporting base plate 41 from shaking or slipping.

[0034] Example 2:

[0035] Based on Embodiment 1, in this embodiment, by activating the far-infrared electric heater 71, the far-infrared electric heater 71 can heat and cure the multiple thermistor blocks 2 below. During this process, when the preset heating time is up, the countdown timer 73 will issue an alarm to alert the surrounding staff, so that the staff can stop the far-infrared electric heater 71 in time, and avoid the thermistor blocks 2 being heated for too long or too short a time by the far-infrared electric heater 71, thereby ensuring the quality of the thermistor blocks 2 being heated and cured.

[0036] The curing assembly 7 includes a far-infrared electric heater 71, a protective cover 72, a countdown timer 73, and a control switch 74. The protective cover 72 is fixedly connected to the right side of the upper surface of the workbench 3 by welding. The protective cover 72 is concave in shape, which not only supports and protects the far-infrared electric heater 71 but also does not obstruct the movement of the support plate 41 to the area below the far-infrared electric heater 71. The far-infrared electric heater 71 is installed on the upper inner wall of the protective cover 72 and is fixed to the upper inner wall of the protective cover 72 by bolts. The heating area of ​​the far-infrared electric heater 71 is larger than the upper surface area of ​​the placement plate 5. The distance between the lower surface of the far-infrared electric heater 71 and the upper surface of the thermistor block 2 placed on the placement plate 5 is 80mm, and the power density of the far-infrared electric heater 71 is 2.5W / cm². 2 The operating temperature of the far-infrared electric heater 71 is 80°C, so that the far-infrared electric heater 71 can cure the thermistor block 2 encapsulated with an epoxy resin structure with a thickness of 0.5mm in 30 minutes. Since the parameters and indicators can be found by searching in the existing publicly available technical fields, they will not be described in detail here.

[0037] A countdown timer 73 is installed on the left side of the front face of the protective cover 72. The countdown timer 73 is electrically connected to an external fixed power supply via a wire. The countdown timer 73 can be set with a countdown time. When the countdown is up, a buzzer will sound an alarm to alert the surrounding staff so that they can stop the far-infrared electric heater 71 in time and prevent the thermistor block 2 from being heated by the far-infrared electric heater 71 for too long. A control switch 74 is installed on the right side of the front face of the protective cover 72. The input terminal of the control switch 74 is electrically connected to an external power supply via a wire, and the output terminal of the control switch 74 is electrically connected to the far-infrared electric heater 71 via a wire. The control switch 74 allows staff to easily control the far-infrared electric heater 71.

[0038] Example 3:

[0039] Based on Embodiment 1, in this embodiment, by controlling the second servo motor 62 to drive the second external threaded rod 63 to rotate forward or reverse, the second external threaded rod 63 can drive the dispensing head in the epoxy resin dispensing machine body 1 to move longitudinally back and forth through the displacement block 64, the lifting electric push rod 65, and the connecting hanging plate 66 to adjust its front and rear dispensing position. When the lifting electric push rod 65 is controlled to extend or retract, the lifting electric push rod 65 can drive the dispensing head in the epoxy resin dispensing machine body 1 to rise or fall through the connecting hanging plate 66 to adjust its dispensing height, thereby increasing the dispensing and encapsulation range of the epoxy resin dispensing machine.

[0040] The adjustment component 6 includes a support frame 61, a second servo motor 62, a second external threaded rod 63, a displacement block 64, a lifting electric push rod 65, and a connecting hanging plate 66. The support frame 61 is fixedly connected to the left side of the upper end face of the worktable 3. The support frame 61 is connected to the worktable 3 by welding. The support frame 61 can support the second servo motor 62 and the second external threaded rod 63. The second servo motor 62 is installed on the upper side of the front end face of the support frame 61. The second servo motor 62 is connected to an external servo motor controller (not shown in the figure) through a wire. The second servo motor 62 and the second external threaded rod 63 are connected by a coupling (not shown in the figure). The second servo motor 62 can drive the second external threaded rod 63 to rotate.

[0041] The second servo motor 62 is connected to a second external threaded rod 63 at its transmission end. A second internal threaded through hole (not shown in the figure) is provided on the upper side of the displacement block 64, and this through hole engages with the thread of the second external threaded rod 63. When the second external threaded rod 63 rotates forward or backward, it can drive the displacement block 64 to move longitudinally back and forth through the second internal threaded through hole. The displacement block 64 is threaded onto the annular side of the second external threaded rod 63, and it supports the lifting electric actuator 65. The lifting electric actuator 65 is installed at the middle position of the lower end face of the displacement block 64, and it is connected to the adjacent... The external control cabinet is electrically connected. The lifting electric push rod 65, displacement block 64, and connecting hanging plate 66 are all connected by bolts. When working, the lifting electric push rod 65 can drive the connecting hanging plate 66 to rise and fall. The connecting hanging plate 66 is installed on the lower end face of the lifting electric push rod 65. The connecting hanging plate 66 can support the dispensing head in the epoxy resin dispensing machine body 1. The upper end face of the support frame 61 is provided with a limiting cavity 67, and the limiting cavity 67 matches the displacement block 64. The limiting cavity 67 can limit and guide the displacement block 64 to prevent the displacement block 64 from shaking or deviating during movement and use.

[0042] Working principle: The operator first places the placement plate 5, which contains multiple thermistor blocks 2 to be coated, into the placement cavity 46 on the upper surface of the supporting base plate 41 (reference). Figure 1Then, the epoxy resin dispensing machine body 1 can be used to coat and encapsulate the upper surfaces of multiple thermistor blocks 2 with epoxy resin. During this process, by controlling the second servo motor 62 to drive the second external thread rod 63 to rotate forward or reverse, the second external thread rod 63 can drive the displacement block 64 to move longitudinally back and forth through the second internal thread through hole. The displacement block 64 will drive the dispensing head in the epoxy resin dispensing machine body 1 to move longitudinally back and forth through the lifting electric push rod 65 and the connecting hanging plate 66 to adjust its front and rear dispensing position. When the lifting electric push rod 65 is extended or retracted, the lifting head can move longitudinally back and forth through the lifting electric push rod 65 and the connecting hanging plate 66 to adjust its front and rear dispensing position. The lowering push rod 65 drives the dispensing head in the epoxy resin dispensing machine body 1 to rise and fall through the connecting hanging plate 66 to adjust its dispensing height. By controlling the first servo motor 43 to drive the first external thread rod 47 to rotate forward or reverse, the second external thread rod 63 can drive the moving seat 42 to move laterally left and right through the first internal thread through hole. The moving seat 42 will drive multiple thermistor blocks 2 to move laterally left and right together through the supporting base plate 41 and the placement plate 5. Through the above-mentioned multiple adjustments, the dispensing head in the epoxy resin dispensing machine body 1 can coat and encapsulate multiple thermistor blocks 2 respectively.

[0043] After multiple thermistors have been coated and encapsulated, the operator first shuts down the epoxy resin dispensing machine body 1, and then controls the first servo motor 43 to drive the first external thread rod 47 to reverse. This allows the first external thread rod 47 to move the multiple thermistor blocks 2 further to the right under the far-infrared electric heater 71 via the moving seat 42, the supporting base plate 41, and the placement plate 5 (see reference). Figure 3 At this point, controlling the far-infrared electric heater 71 will heat and cure the multiple encapsulated thermistor blocks 2 below. During this process, the staff needs to preset the required heating time using the countdown timer 73 so that when the preset time is up, the countdown timer 73 will issue an alarm to remind the surrounding staff to stop the far-infrared electric heater 71 in time, so as to avoid the thermistor blocks 2 being heated for too long by the far-infrared electric heater 71. After the thermistor blocks 2 are heated and cured, the first servo motor 43 continues to drive the first external thread rod 47 to reverse, so that the moving seat 42 drives the multiple cured thermistor blocks 2 to continue to move to the right through the supporting base plate 41 and the placement plate 5, so that the thermistor blocks 2 are removed from the inside of the protective cover 72. At this time, the staff wearing heat-insulating gloves can move the placement plate 5 as a whole, so as to move the cured thermistor blocks 2 to the adjacent external heat preservation box for heat preservation treatment.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An encapsulation structure for a surface mount thermistor, comprising an epoxy resin dispensing machine body (1), a worktable (3), and a placement plate (5), characterized in that: A placement plate (5) is placed above the workbench (3), and multiple thermistor blocks (2) are placed on the upper surface of the placement plate (5). An epoxy resin dispensing machine body (1) is placed above the thermistor blocks (2). A moving component (4) is provided between the workbench (3) and the placement plate (5), and the moving component (4) is used to drive the placement plate (5) to move left and right. A curing component (7) is provided on the right side of the upper end face of the workbench (3), and the curing component (7) is used to heat and cure the thermistor block (2) after it has been coated and encapsulated by the epoxy resin dispensing machine body (1). An adjustment component (6) is provided on the left side of the upper end face of the workbench (3), and the adjustment component (6) is used to adjust the dispensing position and height of the epoxy resin dispensing machine body (1).

2. The encapsulation structure of a surface-mount thermistor according to claim 1, characterized in that: The moving component (4) includes a supporting base plate (41), a moving seat (42), a first servo motor (43), a first support plate (44), a first external threaded rod (47), and a second support plate (48). The first support plate (44) is fixedly connected to the left side of the lower end face of the worktable (3). The first servo motor (43) is installed on the left end face of the first support plate (44). The first external threaded rod (47) is connected to the transmission end of the first servo motor (43). The second support plate (48) is fixedly connected to the right side of the lower end face of the worktable (3). The right end of the first external threaded rod (47) is inside the second support plate (48). The moving seat (42) is installed on the annular side thread of the first external threaded rod (47). The supporting base plate (41) is provided on the upper end face of the moving seat (42).

3. The encapsulation structure of a surface-mount thermistor according to claim 1, characterized in that: The curing component (7) includes a far-infrared electric heater (71), a protective cover (72), a countdown timer (73), and a control switch (74). The protective cover (72) is fixedly connected to the right side of the upper end face of the workbench (3). The far-infrared electric heater (71) is installed on the upper side of the inner wall of the protective cover (72). The countdown timer (73) is installed on the left side of the front end face of the protective cover (72). The control switch (74) is installed on the right side of the front end face of the protective cover (72).

4. The encapsulation structure of a surface-mount thermistor according to claim 1, characterized in that: The adjustment assembly (6) includes a support frame (61), a second servo motor (62), a second external threaded rod (63), a displacement block (64), a lifting electric push rod (65), and a connecting plate (66). The support frame (61) is fixedly connected to the left side of the upper end face of the worktable (3). The second servo motor (62) is installed on the upper side of the front end face of the support frame (61). The second external threaded rod (63) is connected to the transmission end of the second servo motor (62). The displacement block (64) is installed on the annular side thread of the second external threaded rod (63). The lifting electric push rod (65) is installed at the middle position of the lower end face of the displacement block (64). The connecting plate (66) is installed on the lower end face of the lifting electric push rod (65). A limiting cavity (67) is opened on the upper end face of the support frame (61), and the limiting cavity (67) matches the displacement block (64).

5. The encapsulation structure of a surface-mount thermistor according to claim 2, characterized in that: The upper surface of the workbench (3) is provided with a limiting groove (45), and the limiting groove (45) matches the movable seat (42). The upper surface of the supporting base plate (41) is provided with a placement cavity (46), and the placement cavity (46) matches the placement plate (5).

6. The encapsulation structure of a surface-mount thermistor according to claim 1, characterized in that: The upper surface of the placement plate (5) is provided with multiple placement slots (51), and the placement slots (51) are matched with the thermistor block (2). The side of the placement plate (5) is provided with a moving slot (52).

7. The encapsulation structure of a surface-mount thermistor according to claim 3, characterized in that: The far-infrared electric heater (71) has a heating area larger than the upper surface area of ​​the placement plate (5). The input end of the control switch (74) is electrically connected to an external power supply through a wire, and the output end of the control switch (74) is electrically connected to the far-infrared electric heater (71) through a wire.

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