Heat treatment device for bearing manufacturing

Abstract

The application discloses a heat treatment device for bearing manufacturing and relates to the technical field of bearing heat treatment furnaces.The heat treatment device comprises a heating furnace body part, an inner barrier part is installed on the heating furnace body part, and the inner barrier part is used for reducing door opening heat radiation of the heating furnace body part; a bearing stacking part is installed in the inner barrier part; one row of the bearing stacking parts is used for stacking and placing bearings; a closing part is installed on the heating furnace body part; the closing part is used for closing the heating furnace body part; an automatic plugging part is installed on the closing part; the inner barrier part can separate the furnace lining, does not affect normal heating of the rear section of the furnace lining, and can perform heat treatment work on the bearing ring; meanwhile, the front section of the furnace lining can be heat insulated through heat insulation blocks, and the radiation heat when the closing door is opened by workers can be effectively reduced; the problem that current box-type heat treatment furnaces are usually integrated structures, heat radiation is relatively serious, and the furnace body cannot be separated and protected without affecting the convenience of feeding and discharging is solved.

Description

Technical Field

[0001] This invention relates to the field of bearing heat treatment furnace technology, specifically to a heat treatment apparatus for bearing manufacturing. Background Technology

[0002] In the bearing manufacturing process, heat treatment is the core process to ensure the metallurgical structure and properties of bearing rings. Box furnaces are commonly used in the industry for heating operations because they have the advantage of batch heating of bearing rings, and are therefore widely used. The quality of heat treatment directly determines the service life, mechanical properties, and other key indicators of the finished bearing. However, current box heat treatment furnaces are usually of a general type and do not have a separate structure for the heat treatment of bearing rings. This results in poor heating uniformity of the bearing rings. At the same time, traditional furnace bodies are usually of a one-piece structure, which leads to severe heat radiation when the furnace door is opened, increasing safety hazards. It is also difficult to separate and protect the furnace body without affecting the convenience of loading and unloading, and it is difficult to achieve heat insulation buffer and heat dissipation transition before the door is opened. In addition, frequent opening and closing of the door will cause the heat loss rate to be too fast, increasing energy consumption, and frequent temperature changes will affect the heat treatment quality of the bearing rings.

[0003] Therefore, we propose a heat treatment apparatus for bearing manufacturing. Summary of the Invention

[0004] The purpose of this invention is to provide a heat treatment apparatus for bearing manufacturing, in order to solve the problem mentioned in the background art that the current box-type heat treatment furnaces are usually of an integrated structure, with serious heat radiation, and it is not convenient to separate and protect the furnace body without affecting the convenience of loading and unloading.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heat treatment apparatus for bearing manufacturing, comprising a heating furnace body, wherein an inner barrier is installed on the heating furnace body to reduce heat radiation from the furnace body when the door is open; a row of bearing stacks is installed inside the inner barrier; the row of bearing stacks is used to stack bearings; a sealing member is installed on the heating furnace body to seal the heating furnace body; an automatic sealing member is installed on the sealing member; the heating furnace body includes: a heat treatment furnace, a connecting screw hole, and a ventilation switch; the heat treatment furnace has a connecting screw hole; a ventilation switch is fixedly installed at the bottom of the connecting screw hole.

[0006] Preferably, the heating furnace body further includes: a furnace lining, which is fixedly installed inside the heat treatment furnace; an electric heating tube is embedded in the rear section of the inner side of the furnace lining; the furnace lining is used for heat insulation.

[0007] Preferably, the heating furnace body further includes: an exhaust pipe, an exhaust fan, and a solenoid valve. The exhaust pipe is installed on the furnace lining and passes through the heat treatment furnace. An exhaust fan is fixedly installed on the exhaust pipe. A solenoid valve is installed on the exhaust fan's outlet pipe. The exhaust fan communicates with the interior of the furnace lining.

[0008] Preferably, the inner barrier includes: an inner frame, a heat insulation block, and a feed inlet; the inner frame is fixedly embedded in the rear side of the furnace lining; a heat insulation block is fixedly installed at the front end of the inner frame and is fixedly installed inside the furnace lining; the heat insulation block is used to isolate the rear heating zone of the furnace lining; the heat insulation block is located in front of the heating tube inside the furnace lining; the heat insulation block is located behind the exhaust fan; and a feed inlet is provided at the bottom of the heat insulation block, penetrating the front side of the inner frame.

[0009] Preferably, the bearing stack includes: a stacking plate, positioning grooves, and heat equalization holes. The stacking plate is slidably installed inside the inner frame. The stacking plate can pass through the feed inlet. The front and rear sides of the stacking plate are provided with reverse chamfers. The front end of the stacking plate is provided with a through hole. The stacking plate has four rows of positioning grooves, and the positioning grooves are used to place bearing rings. The stacking plate has four rows of heat equalization holes, and the four rows of heat equalization holes are respectively connected to the four rows of positioning grooves.

[0010] Preferably, the bearing stack further includes: support bars, two of which are fixedly installed on the stack plate; the support bars are located at the intervals of the positioning grooves.

[0011] Preferably, the sealing component includes: a sealing door and a sealing threaded cylinder, the sealing door being rotatably mounted on the heat treatment furnace; the sealing threaded cylinder being inserted into the sealing door; the sealing threaded cylinder being provided with a handwheel; the sealing threaded cylinder being threadedly connected to a connecting screw hole; the sealing door being used to seal the heat treatment furnace.

[0012] Preferably, the sealing element further includes: a sealing post and a compression spring, wherein the sealing post is slidably inserted into the sealing threaded cylinder; the compression spring is sleeved inside the sealing threaded cylinder; one end of the compression spring is fixedly connected to the tail of the sealing post, and the other end of the compression spring is fixedly connected inside the sealing threaded cylinder; the end of the sealing post elastically compresses the ventilation switch.

[0013] Preferably, the automatic sealing component includes: a sliding mounting block, a pressing shell, and a heat insulation strip. The sliding mounting block is fixedly mounted on the closed door; the pressing shell is slidably mounted on the sliding mounting block; a heat insulation strip is fixedly mounted on the front end of the pressing shell; the heat insulation strip is used to seal the feed inlet, and the bottom of the heat insulation strip is slidably attached to the inner side of the furnace lining; the heat insulation strip is used to elastically attach to the heat insulation block.

[0014] Preferably, the automatic sealing component further includes: an electromagnet and a return spring; the electromagnet is fixedly mounted on the sliding mounting block and is used to magnetically press the housing; two return springs are provided, each located inside the pressing housing; one end of each return spring is connected to the sliding mounting block, and the other end of each return spring is fixedly connected inside the pressing housing; the ventilation switch is electrically connected to the electromagnet, the exhaust fan, and the solenoid valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention uses internal barrier components to separate the furnace lining without affecting the normal heating of the rear section of the furnace lining for heat treatment of the bearing ring. At the same time, the front section of the furnace lining can be insulated by heat insulation blocks, which can effectively reduce the radiant heat when workers open the closed door, improve the comfort of the working environment, and reduce safety hazards.

[0017] The system employs a sealing component to enclose the heat treatment furnace and can be used in conjunction with a ventilation switch to automatically start the exhaust fan when the closed door is opened, thus ventilating and removing heat and further reducing the heat in front of the insulation block. Simultaneously, the structure utilizes an automatic sealing component to automatically control the insulation strip to block the feed inlet when the closed door is closed, ensuring insulation quality. The controllable extension and retraction mechanism prevents excessive friction on the insulation block when the insulation strip rotates during the opening of the closed door. The structure is simple to control, requiring no manual operation for ventilation or blocking the feed inlet; it is quickly and automatically controlled when the closed door is opened or closed.

[0018] By using bearing stacking components, bearings can be stacked in batches into the inner frame. At the same time, the stacking plates are designed with reverse chamfers at both ends. When multiple stacking plates need to be placed in the inner frame or the number of bearings to be heat-treated in a single batch needs to be increased, they can be directly inserted into the feed port. The stacking plates, which can be pulled out one by one, can still maintain good heat preservation effect when stacked behind the heat insulation block, which can effectively reduce the temperature difference of the bearing ring when the door is opened and closed repeatedly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a heat treatment apparatus for bearing manufacturing according to the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of a heat treatment apparatus for bearing manufacturing according to the present invention;

[0021] Figure 3 This is a cross-sectional view of the internal structure of a heat treatment apparatus for bearing manufacturing according to the present invention.

[0022] Figure 4 for Figure 2 Enlarged view of the structure of region C in the middle;

[0023] Figure 5 This is a schematic diagram of the internal barrier structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the bearing stack structure of the present invention;

[0025] Figure 7 This is a cross-sectional view of the internal structure of the closure component of the present invention;

[0026] Figure 8 for Figure 7 Enlarged view of the structure of region D in the middle;

[0027] Figure 9 This is a cross-sectional view of the internal structure of the automatic sealing component of the present invention;

[0028] Figure 10 for Figure 3 Enlarged view of the structure of region E in the middle.

[0029] In the diagram: 1. Heating furnace body; 101. Heat treatment furnace; 1011. Connecting screw hole; 1012. Ventilation switch; 102. Furnace lining; 103. Exhaust pipe; 104. Exhaust fan; 105. Solenoid valve; 2. Internal barrier; 201. Inner frame; 202. Heat insulation block; 203. Feed inlet; 3. Bearing stack; 301. Stacking plate; 3011. Positioning groove; 3012. Heat equalization hole; 302. Support bar; 4. Sealing component; 401. Sealing door; 402. Sealing threaded cylinder; 403. Sealing column; 404. Compression spring; 5. Automatic sealing component; 501. Sliding mounting block; 502. Pressing shell; 503. Heat insulation strip; 504. Electromagnet; 505. Return spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1 to 10 As shown:

[0032] This invention provides a technical solution: a heat treatment apparatus for bearing manufacturing, comprising a heating furnace body 1, an inner barrier 2 installed on the heating furnace body 1, the inner barrier 2 being used to reduce heat radiation when the heating furnace body 1 is opened; a row of bearing stacking components 3 installed inside the inner barrier 2; the row of bearing stacking components 3 being used to stack and place bearings; a sealing component 4 installed on the heating furnace body 1; the sealing component 4 being used to seal the heating furnace body 1; an automatic sealing component 5 installed on the sealing component 4; the heating furnace body 1 includes: a heat treatment furnace 101, a connecting screw hole 1011 and a ventilation switch 1012, the heat treatment furnace 101 having a connecting screw hole 1011; a ventilation switch 1012 being fixedly installed at the bottom of the connecting screw hole 1011.

[0033] The heating furnace body 1 further includes: a furnace lining 102, which is fixedly installed inside the heat treatment furnace 101; an electric heating tube is embedded in the rear section of the inner side of the furnace lining 102; the furnace lining 102 is used for heat insulation; the heating furnace body 1 also includes: an exhaust pipe 103, an exhaust fan 104, and a solenoid valve 105; the exhaust pipe 103 is installed on the furnace lining 102 and passes through the heat treatment furnace 101; the exhaust fan 104 is fixedly installed on the exhaust pipe 103; the solenoid valve 105 is installed on the exhaust pipe of the exhaust fan 104; the exhaust fan 104 connects to the interior of the furnace lining 102; the inner barrier 2 includes: an inner frame 201, a heat insulation block 202, and a feed inlet 203; the inner frame 201 is fixedly embedded in the rear side of the furnace lining 102; the heat insulation block 202 is fixedly installed at the front end of the inner frame 201 and is fixedly installed on the furnace lining 102; 2. Inner side; heat insulation block 202 is used to isolate the rear heating area of ​​furnace lining 102; heat insulation block 202 is located in front of the heating tube inside furnace lining 102; heat insulation block 202 is located behind exhaust fan 104; a feed inlet 203 is opened at the bottom of heat insulation block 202, which passes through the front side of inner frame 201; the inner barrier 2 can separate furnace lining 102 without affecting the normal heating of the rear section of furnace lining 102 for heat treatment of bearing rings. At the same time, the front section of furnace lining 102 can be insulated by heat insulation block 202, which can effectively reduce the radiant heat when workers open the closed door 401, improve the comfort of the working environment, and reduce safety hazards. At the same time, this structure uses exhaust fan 104 for ventilation, which reduces the heat in the area in front of heat insulation block 202, and can achieve gradient buffering to prevent heat from directly hitting workers when the closed door 401 is opened.

[0034] The bearing stack 3 includes: a stacking plate 301, positioning grooves 3011, and heat equalization holes 3012. The stacking plate 301 is slidably installed inside the inner frame 201. The stacking plate 301 can pass through the feed inlet 203. The front and rear sides of the stacking plate 301 are provided with reverse chamfers. The front end of the stacking plate 301 is provided with a through hole. The stacking plate 301 has four rows of positioning grooves 3011, and the positioning grooves 3011 are used to place bearing rings. The stacking plate 301 has four rows of heat equalization holes 3012, and the four rows of heat equalization holes 3012 respectively pass through the four rows of positioning grooves 3011. The bearing stack 3 also includes: support bars 302. Two support bars 302 are fixedly installed on the stacking plate 301. The support bars 302 are located at the intervals of the positioning grooves 3011. The bearing stacking component 3 allows for the batch stacking of bearings into the inner frame 201. The stacking plate 301 has reverse chamfers at both ends, allowing for direct insertion into the feed inlet 203 when multiple stacking plates 301 need to be placed within the inner frame 201 to increase the number of heat-treated bearings. The operation is simple, and the small opening size of the feed inlet 203 minimizes its impact on the insulation effect of the heat insulation block 202, resulting in a simpler structure. Furthermore, the use of individually pull-out stacking plates 301 ensures that the stacking plates 301 stacked behind the heat insulation block 202 maintain good insulation performance, effectively reducing the temperature difference affecting the bearing rings when the closing door 401 is repeatedly opened and closed. This design is more suitable for batch heat treatment operations.

[0035] In Example 2, based on Example 1, the sealing component 4 includes: a sealing door 401 and a sealing threaded cylinder 402. The sealing door 401 is rotatably mounted on the heat treatment furnace 101; the sealing threaded cylinder 402 is inserted into the sealing door 401; a handwheel is provided on the sealing threaded cylinder 402; the sealing threaded cylinder 402 is threadedly connected to the connecting screw hole 1011; the sealing door 401 is used to seal the heat treatment furnace 101; the sealing component 4 also includes: a sealing column 403 and a compression spring 404. The sealing column 403 is slidably inserted into the sealing threaded cylinder 402; the compression spring 404 is sleeved inside the sealing threaded cylinder 402; one end of the compression spring 404 is fixedly connected to... The other end of the compression spring 404 is fixedly connected to the closed threaded cylinder 402 at the tail of the closed column 403; the end of the closed column 403 is elastically compressed by the ventilation switch 1012; the automatic sealing component 5 includes: a sliding mounting block 501, a pressing shell 502, and a heat insulation strip 503. The sliding mounting block 501 is fixedly installed on the closed door 401; the pressing shell 502 is slidably installed on the sliding mounting block 501; the heat insulation strip 503 is fixedly installed at the front end of the pressing shell 502; the heat insulation strip 503 is used to seal the feed inlet 203, and the bottom of the heat insulation strip 503 is slidably attached to the inner side of the furnace lining 102; the heat insulation strip 503 is used to elastically attach to the heat insulation block 202; The dynamic sealing component 5 also includes: an electromagnet 504 and a return spring 505. The electromagnet 504 is fixedly mounted on the sliding mounting block 501 and is used to magnetically press the housing 502. Two return springs 505 are provided, and the two return springs 505 are respectively located inside the pressing housing 502. One end of the two return springs 505 is connected to the sliding mounting block 501, and the other end of the two return springs 505 is fixedly connected inside the pressing housing 502. The ventilation switch 1012 is electrically connected to the electromagnet 504, the exhaust fan 104, and the solenoid valve 105. The sealing component 4 is used to seal the heat treatment furnace 101 and can be used in conjunction with the ventilation switch 1012. When the closed door 401 is opened, the exhaust fan 104 is automatically started to ventilate and remove heat, further reducing the heat in front of the insulation block 202. At the same time, the automatic sealing component 5 can automatically control the insulation strip 503 to block the feed inlet 203 when the closed door 401 is closed, ensuring the quality of insulation. By controlling the extension and retraction, excessive friction on the insulation block 202 can be avoided when the closed door 401 is opened and the insulation strip 503 is rotated. The structure is simple to control and does not require manual operation of ventilation or blocking of the feed inlet 203. It can be quickly and automatically controlled when the closed door 401 is opened and closed, which can prevent the staff from forgetting to ventilate.

[0036] The working principle of this embodiment is as follows: During bearing heat treatment, the operator first places the bearing ring to be heat-treated into the positioning groove 3011. The number of stacking plates 301 used can be adjusted according to the amount of heat treatment. The first stacking plate 301 is inserted into the feed inlet 203, and then the second stacking plate 301 can be inserted into the feed inlet 203. At this time, the rear inclined surface of the second stacking plate 301 can press against the front inclined surface of the first stacking plate 301, thus pushing the first stacking plate 301 upward along the inner frame 201 to achieve the filling of the stacking plates 301. Then, the sealing door 401 can be closed, and the sealing threaded cylinder 402 is threaded into the connecting screw hole 1011 to secure the sealing door 401. When the closed threaded cylinder 402 is tightened, the closing column 403 will press the ventilation switch 1012. The compression spring 404 can elastically press the closing column 403 for elastic support. At this time, the ventilation switch 1012 can control the exhaust fan 104 to stop exhausting and the solenoid valve 105 to close. At the same time, after the closed door 401 is closed, the heat insulation strip 503 aligns with the feed inlet 203. Under the control of the ventilation switch 1012, the electromagnet 504 will no longer magnetically attract the pressing shell 502. At this time, under the compression of the return spring 505, the pressing shell 502 can be pushed to move the heat insulation strip 503, which elastically fits the heat insulation block 202, blocks the feed inlet 203, and provides heat insulation protection. The subsequent heat treatment heating work can then be carried out.

[0037] After the bearing ring has been heat-treated, when it needs to be removed, the closed threaded cylinder 402 needs to be rotated and disassembled first. At this time, the sealing column 403 no longer presses the ventilation switch 1012. At this time, the electromagnet 504 will be turned on and the exhaust fan 104 will also be started to perform negative pressure suction. At the same time, the electromagnet 504 will press the shell 502 through electromagnetic attraction, causing the heat insulation strip 503 to retract and separate from the heat insulation block 202. After the closed threaded cylinder 402 is completely unscrewed, the operator can rotate and open the sealing door 401. Then, the furnace hook can be inserted into the through hole on the bottom stack plate 301 to pull out the stack plate 301 for material removal. In this way, a stack of stack plates 301 can be removed one by one. After the bottom stack plate 301 is removed, the upper stack plate 301 is still behind the heat insulation block 202 to maintain heat preservation and heating.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat treatment apparatus for bearing manufacturing, comprising a heating furnace body (1), wherein an inner barrier (2) is installed on the heating furnace body (1), characterized in that: The inner barrier (2) is used to reduce the heat radiation of the heating furnace body (1) when the door is opened; a row of bearing stacks (3) is installed inside the inner barrier (2); the row of bearing stacks (3) is used to stack and place bearings. A sealing element (4) is installed on the heating furnace body (1); the sealing element (4) is used to seal the heating furnace body (1); an automatic sealing element (5) is installed on the sealing element (4). The heating furnace body (1) includes a heat treatment furnace (101), on which a connecting screw hole (1011) is provided; a ventilation switch (1012) is fixedly installed at the bottom of the connecting screw hole (1011).

2. The heat treatment apparatus for bearing manufacturing according to claim 1, characterized in that: The heating furnace body (1) further includes: a furnace lining (102), which is fixedly installed inside the heat treatment furnace (101); an electric heating tube is embedded in the rear section of the inner side of the furnace lining (102).

3. The heat treatment apparatus for bearing manufacturing according to claim 2, characterized in that: The heating furnace body (1) further includes: an exhaust pipe (103), which is installed on the furnace lining (102) and passes through the heat treatment furnace (101); an exhaust fan (104) is fixedly installed on the exhaust pipe (103); a solenoid valve (105) is installed on the exhaust pipe (104); and the exhaust fan (104) is connected to the interior of the furnace lining (102).

4. The heat treatment apparatus for bearing manufacturing according to claim 3, characterized in that: The inner barrier (2) includes an inner frame (201) and a feed inlet (203). The inner frame (201) is fixedly embedded in the rear side of the furnace lining (102). A heat insulation block (202) is fixedly installed at the front end of the inner frame (201) and the heat insulation block (202) is fixedly installed inside the furnace lining (102). The heat insulation block (202) is used to isolate the rear heating zone of the furnace lining (102). The heat insulation block (202) is located in front of the heating tube inside the furnace lining (102). The heat insulation block (202) is located behind the exhaust fan (104). A feed inlet (203) is opened at the bottom of the heat insulation block (202) and passes through the front side of the inner frame (201).

5. The heat treatment apparatus for bearing manufacturing according to claim 4, characterized in that: The bearing stack (3) includes: a stack plate (301), which is slidably installed inside the inner frame (201); the stack plate (301) can pass through the feed port (203); the stack plate (301) has reverse chamfers on the front and rear sides; the stack plate (301) has a through hole at the front end; the stack plate (301) has four rows of positioning grooves (3011); the stack plate (301) has four rows of heat equalization holes (3012), and the four rows of heat equalization holes (3012) respectively pass through the four rows of positioning grooves (3011).

6. The heat treatment apparatus for bearing manufacturing according to claim 5, characterized in that: The bearing stack (3) further includes: support bars (302), and two support bars (302) are fixedly installed on the stack plate (301).

7. The heat treatment apparatus for bearing manufacturing according to claim 4, characterized in that: The sealing component (4) includes: a sealing door (401), which is rotatably mounted on the heat treatment furnace (101); a sealing threaded cylinder (402) is inserted into the sealing door (401); a handwheel is provided on the sealing threaded cylinder (402); the sealing threaded cylinder (402) is threaded into the connecting screw hole (1011); the sealing door (401) is used to seal the heat treatment furnace (101).

8. The heat treatment apparatus for bearing manufacturing according to claim 7, characterized in that: The closure component (4) further includes: a closure post (403), which is slidably inserted into the closure threaded cylinder (402); a compression spring (404) is sleeved inside the closure threaded cylinder (402); one end of the compression spring (404) is fixedly connected to the tail of the closure post (403), and the other end of the compression spring (404) is fixedly connected inside the closure threaded cylinder (402); the end of the closure post (403) elastically compresses the ventilation switch (1012).

9. A heat treatment apparatus for bearing manufacturing according to claim 7, characterized in that: The automatic sealing component (5) includes: a sliding mounting block (501), which is fixedly mounted on the closed door (401); a pressing shell (502) is slidably mounted on the sliding mounting block (501); a heat insulation strip (503) is fixedly mounted on the front end of the pressing shell (502); the heat insulation strip (503) is used to block the feed inlet (203), and the bottom of the heat insulation strip (503) is slidably attached to the inner side of the furnace lining (102); the heat insulation strip (503) is used to elastically attach to the heat insulation block (202).

10. A heat treatment apparatus for bearing manufacturing according to claim 9, characterized in that: The automatic sealing component (5) further includes: an electromagnet (504) and a return spring (505). The electromagnet (504) is fixedly installed on the sliding mounting block (501) and is used to magnetically press the housing (502). There are two return springs (505), which are located inside the pressing housing (502). One end of the two return springs (505) is connected to the sliding mounting block (501), and the other end of the two return springs (505) is fixedly connected inside the pressing housing (502). The ventilation switch (1012) is electrically connected to the electromagnet (504), the exhaust fan (104), and the solenoid valve (105).

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