Vacuum quenching furnace, heat treatment process and its application in the production of starter non-return device

Abstract

The present invention discloses a vacuum quenching furnace, a heat treatment process and its application in the production of a starter non-return device, and relates to the technical field of heat treatment equipment. The vacuum quenching furnace includes a furnace body, a lifting unit, a bearing unit and a transmission unit. The furnace body includes a cooling chamber and a heating chamber. A barrier mechanism is provided at the junction between the cooling chamber and the heating chamber. A quenching oil tank is provided at the bottom of the cooling chamber. A filter unit is provided on the lifting unit. The lifting unit includes two symmetrically distributed slide rails, a hydraulic lifting seat and a support plate. The bearing unit includes two symmetrically distributed limit rods, and a limit plate is movably sleeved on the limit rods. During the oil quenching process, the present invention effectively prevents the residue in the oil from adhering to the parts, and facilitates the cleaning of the residue in the oil. In addition, during the quenching process, the oil temperature is effectively guaranteed to be evenly distributed, thereby improving the quenching effect.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment equipment, in particular to a vacuum quenching furnace, a heat treatment process and applications thereof in the production of a starter non-return device. Background Art

[0002] A vacuum quenching furnace is an advanced equipment that quenches metal materials under a strictly controlled vacuum or protective atmosphere. Among them, vacuum oil quenching furnaces are widely used in many fields. As the automotive industry's requirements for lightweight and high-strength metal materials continue to increase, vacuum oil quenching furnaces can provide efficient and environmentally friendly heat treatment solutions, especially for the heat treatment of automobile starter one-way devices. Vacuum quenching furnaces are indispensable heat treatment equipment.

[0003] The Chinese invention patent with application number 2012105676191 discloses a quenching cooling control system for a vacuum oil quenching furnace, and its innovation lies in: a quenching oil tank is connected to the lower part of the vacuum oil quenching furnace body, and a quenching oil circulation pipeline is externally connected to the quenching oil tank, and a quenching oil flow meter, a quenching oil flow proportional valve, a heat exchanger and a quenching oil circulation pump are sequentially connected in series on the quenching oil circulation pipeline, and a quenching oil heating pipeline is connected in parallel between the quenching oil flow meter and the quenching oil circulation pump, and a quenching oil heating pipeline valve is connected in series on the quenching oil heating pipeline; an oil temperature sensor and a quenching oil heater are arranged on the inner wall of the quenching oil tank; a programmable controller PLC is arranged outside the vacuum oil quenching furnace, and the programmable controller PLC is respectively connected to the quenching oil heater, the oil temperature sensor, the quenching oil flow meter, the quenching oil flow proportional valve, the water inlet flow proportional valve and the quenching oil heating pipeline valve. However, when the quenching oil in the quenching oil tank is used, the residue on the parts will fall into the quenching oil, and when it is used again, it will adhere to other parts that are oil-quenched and affect the quenching quality. At the same time, it is inconvenient to clean the residue in the quenching oil.

[0004] Moreover, when the parts are immersed in the quenching oil, since the parts first come into contact with the upper part of the quenching oil, the quenching oil close to the liquid surface first quickly absorbs the heat on the parts and causes the temperature to rise rapidly. As the parts are immersed downward, the temperature of the parts gradually decreases, resulting in a large difference in oil temperature between the upper and lower parts of the quenching oil, which in turn affects the quenching efficiency and quenching effect of the parts. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a vacuum quenching furnace, a heat treatment process and its application in the production of starter check valves. During the oil quenching process, the residue in the oil is effectively prevented from adhering to the parts, and the residue in the oil is easy to clean. In addition, during the quenching process, the oil temperature distribution is effectively guaranteed to be uniform, the quenching effect is improved, and the problems in the background technology can be effectively solved.

[0006] To achieve the above object, the present invention provides the following technical solutions: a vacuum quenching furnace, which is suitable for heat treatment of a starter non-return device, and comprises a furnace body, a lifting unit, a bearing unit and a transmission unit, wherein the furnace body comprises a cooling chamber and a heating chamber, a barrier mechanism is provided at the junction of the cooling chamber and the heating chamber, a quenching oil tank is provided at the bottom of the cooling chamber, and a filter unit is provided on the lifting unit;

[0007] The lifting unit includes two symmetrically distributed slide rails, a hydraulic lifting seat and a support plate;

[0008] The bearing unit comprises two symmetrically distributed limiting rods, the limiting rods are movably sleeved with limiting plates, the limiting rods are sleeved with buffer springs at the bottom of the limiting plates, baffles are provided at both ends of the limiting plates, and a wedge-shaped surface is provided on the top of the baffles;

[0009] The filter unit comprises a filter plate arranged between slide rails on both sides.

[0010] Preferably, the lifting unit is arranged at the bottom of the cooling chamber, the carrying unit is arranged at the top of the lifting unit, and the conveying unit is arranged at the inner wall of the cooling chamber;

[0011] The transmission unit includes two groups of symmetrically distributed fixed rods, a transmission motor is provided at the end of the fixed rod, a transmission wheel is provided on the output shaft of the transmission motor, two transmission wheels in the same group are connected by a transmission belt, an electric push rod is provided on the side of the conveyor belt, and a matching block is provided at the telescopic end of the electric push rod.

[0012] Preferably, each group of fixing rods includes two fixing rods, and the two groups of fixing rods are respectively arranged on both sides of the cooling chamber, and the outside of the matching block is correspondingly matched with a U-shaped seat, and the U-shaped seat is arranged on the top surface of the hydraulic lifting seat.

[0013] Preferably, sealing doors are movably provided at both ends of the cooling chamber, a first partition is provided at the feed end of the cooling chamber, a feed port is provided in the middle of the first partition, a second partition corresponding to the blocking mechanism is provided at the junction between the cooling chamber and the heating chamber, and a feeding port is provided in the middle of the second partition.

[0014] Preferably, the two slide rails are symmetrically slidably fitted on both sides between the first partition and the second partition, the hydraulic lifting seat is slidably fitted on the top of the slide rails, the support plate is arranged at the lifting end of the hydraulic lifting seat, and the surface of the support plate is clamped with a carrier plate.

[0015] Preferably, first hydraulic rods are provided on both sides of the bottom of the quenching oil tank, and the top telescopic ends of the first hydraulic rods on both sides are fixedly connected to the bottoms of the slide rails on both sides respectively;

[0016] The two limiting rods are respectively arranged on two sides of the carrier plate, and the limiting holes are evenly arranged on the limiting plate.

[0017] Preferably, two filter plates are symmetrically arranged, and the sides of the two filter plates that are away from each other are movably connected to the slide rails on both sides respectively, and a second hydraulic rod is movably arranged between the bottom surface of the filter plate on each side and the inner side surface of the quenching oil tank.

[0018] The present invention also provides a heat treatment process of a vacuum quenching furnace, wherein the heat treatment process utilizes the vacuum quenching furnace to achieve heat treatment of a starter non-return device, and comprises the following steps:

[0019] S1, open one end of the cooling chamber, place the carrying unit with parts on the support plate, use an external feeding trolley to place the hydraulic lifting seat on the slide rail in the cooling chamber, lift the parts to a high position, and then close the furnace body;

[0020] S2, start the external vacuum unit to draw vacuum from the cooling chamber and the heating chamber until the pressure of the two chambers is balanced, open the blocking mechanism, start the conveying unit to drive the carrying unit to convey the parts to the heating chamber, and lower the hydraulic lifting seat to place the carrying unit and the parts thereon on the carrying rack in the heating chamber;

[0021] S3, resetting the hydraulic lifting seat to the initial position in the cooling chamber, closing the blocking mechanism, and using an external vacuum unit to draw the vacuum degree of the heating chamber to the heating start condition and then starting heating;

[0022] S4. After heating is completed, the blocking mechanism is opened, and the hydraulic lifting seat is used to drive the support plate to move to the heating chamber and to the bottom of the carrying unit by the conveying unit. The support plate is lifted by the hydraulic lifting seat to support the parts and returned to the cooling chamber by the conveying unit, and the carrying unit is dropped to a low position, and the blocking mechanism is closed;

[0023] S5, moving the slide rail downward, immersing the parts on the carrying unit in the quenching oil in the quenching oil tank for quenching;

[0024] S6. After quenching, the parts rise to the initial state, and the vacuum unit is used to evacuate the cooling chamber to a specified value. After waiting for a preset time, the air release valve on the top of the cooling chamber is opened, the cooling chamber is opened, and the parts are taken out using an external feeding trolley.

[0025] The present invention also provides an application of the vacuum quenching furnace as described above in the production of a starter non-return device.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. When the parts are immersed in the quenching oil, the filter plate blocks the residues and debris in the oil below the filter plate to prevent the residues and debris from floating up and contacting the parts, thereby effectively preventing the residues and debris from adhering to the surface of the parts.

[0028] 2. In the present invention, after the parts are completely immersed in the quenching oil, the wedge surface is located above the quenching oil, and the transmission unit is used to move the matching block to a position close to the wedge surface, and then the matching block is reciprocated, so that the matching block reciprocates along the wedge surface, realizing the up and down reciprocating movement of the limit plate, stirring the quenching oil up and down, improving the uniformity of the quenching oil temperature, and then improving the quenching effect and efficiency of the parts.

[0029] 3. After the heat treatment is completed, the hydraulic lifting seat is taken out of the present invention, and the first hydraulic rod drives the slide rail to move up and down. At the same time, the two second hydraulic rods drive the filter plates on both sides to swing, so that the residual debris in the quenching oil is in a floating state. After the filter plate stops swinging, the first hydraulic rod is used to drive the filter plate to move downward until it contacts the bottom surface of the quenching oil tank, and then the second hydraulic rod is extended. The filter plates on both sides are gradually brought together and gradually tend to be horizontal until the filter plates on both sides are horizontally coplanar. The residual debris is collected on the surface of the filter plate, and the filter plate is moved upward to lift the residual debris above the liquid surface of the oil, thereby realizing the cleaning of the residual debris in the quenching oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of the cooling chamber of the present invention;

[0032] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0033] Figure 4 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0034] Figure 5 This is a schematic diagram of the cross-sectional structure of the cooling chamber of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the filter unit of the present invention.

[0036] In the figure: 1. furnace body; 101. cooling chamber; 102. heating chamber; 103. blocking mechanism; 104. sealing door; 105. quenching oil tank; 106. first partition; 107. second partition; 2. lifting unit; 201. slide rail; 202. hydraulic lifting seat; 203. support plate; 204. carrier plate; 205. first hydraulic rod; 3. bearing unit; 301. limiting rod; 302. limiting plate; 303. buffer spring; 304. limiting hole; 305. baffle; 306. wedge surface; 401. fixing rod; 402. transmission motor; 403. transmission wheel; 404. conveyor belt; 405. electric push rod; 406. matching block; 407. U-shaped seat; 5. filtering unit; 501. filter plate; 502. second hydraulic rod. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0038] See also Figure 1-6 The present embodiment provides a vacuum quenching furnace, including a furnace body 1, a lifting unit 2, a bearing unit 3 and a conveying unit, and also includes an external electrical control system, a vacuum unit, a pipeline system and an oil circulation temperature control system. The lifting unit 2 is arranged at the bottom of the cooling chamber 101, the bearing unit 3 is arranged at the top of the lifting unit 2, and the conveying unit is arranged on the inner wall of the cooling chamber 101. The lifting unit 2 is used to realize the lifting and lowering of the bearing unit 3, the bearing unit 3 is used to support and limit the parts, and the conveying unit is used for the horizontal movement of the lifting unit 2 to realize the horizontal transportation and transmission of the bearing unit 3 inside the furnace body 1.

[0039] The furnace body 1 includes a cooling chamber 101 and a heating chamber 102. A barrier mechanism 103 is provided at the junction between the cooling chamber 101 and the heating chamber 102. The barrier mechanism 103 is used to achieve sealing between the cooling chamber 101 and the heating chamber 102. The barrier mechanism 103 is initially in a closed state. The barrier mechanism 103 is preferably an existing conventional technology. A quenching oil tank 105 is provided at the bottom of the cooling chamber 101. The quenching oil tank 105 is used to contain quenching oil.

[0040] Sealing doors 104 are movably provided at both ends of the cooling chamber 101, and the sealing doors 104 are used to achieve sealing at both ends of the furnace body 1. The driving device for opening and closing the sealing door 104 is preferably a hydraulic telescopic mechanism. A first partition 106 is provided at the feed end of the cooling chamber 101, and a feed port is opened in the middle of the first partition 106. The feed port is used to carry the unit 3 into the cooling chamber 101. A second partition 107 corresponding to the blocking mechanism 103 is provided at the junction between the cooling chamber 101 and the heating chamber 102, and a feeding port is opened in the middle of the second partition 107. The feeding port is used to transfer the unit 3 between the cooling chamber 101 and the heating chamber 102, and the blocking mechanism 103 controls the opening and closing of the feeding port.

[0041] The lifting unit 2 includes two symmetrically distributed slide rails 201, a hydraulic lifting seat 202 and a support plate 203. The two slide rails 201 are symmetrically slidably matched on both sides between the first partition 106 and the second partition 107. The bottom surface of the slide rail 201 is provided with a guide hole. The two ends of the slide rail 201 are respectively slidably connected with the first partition 106 and the second partition 107 on both sides. The hydraulic lifting seat 202 is slidably matched on the top of the slide rail 201. The support plate 203 is arranged at the lifting end of the hydraulic lifting seat 202. The hydraulic lifting seat 202 is driven by the hydraulic telescopic mechanism arranged inside. The support plate 203 is raised and lowered, and the carrier plate 204 is clamped on the surface of the support plate 203. First hydraulic rods 205 are provided on both sides of the bottom of the quenching oil tank 105. The top telescopic ends of the first hydraulic rods 205 on both sides are respectively fixedly connected to the bottoms of the slide rails 201 on both sides. The telescopic drive of the first hydraulic rod 205 drives the slide rails 201 to rise and fall. The two opposite inner sides of the quenching oil tank 105 are respectively flush with the sides of the first partition plate 106 and the second partition plate 107, and the sides of the slide rails 201 on both sides that are away from each other are respectively in contact with the other two opposite inner sides of the quenching oil tank 105.

[0042] The bearing unit 3 includes two symmetrically distributed limit rods 301, and the two limit rods 301 are respectively arranged on both sides of the carrier plate 204. The limit rods 301 are movably sleeved with limit plates 302, and limit holes 304 are evenly arranged on the limit plates 302. The limit holes 304 are used to prevent the starter one-way device from being limited by the structural characteristics of the starter one-way device's own large and small heads. The limit rod 301 is located at the bottom surface of the limit plate 302 and is sleeved with a buffer spring 303. The buffer spring 303 is used to buffer and protect the parts on the limit plate 302 during transportation to prevent them from being damaged. Baffles 305 are provided at both ends of the limit plate 302. The baffles 305 are used to protect the parts and prevent them from falling.

[0043] The conveying unit includes two groups of symmetrically distributed fixed rods 401, each group of fixed rods 401 includes two fixed rods, and the two groups of fixed rods 401 are respectively arranged on both sides of the cooling chamber 101. A conveying motor 402 is provided at the end of the fixed rod 401, and a conveying wheel 403 is provided on the output shaft of the conveying motor 402. The two conveying wheels 403 in the same group are connected by a conveyor belt 404. The conveying wheel 403 and the conveyor belt 404 are preferably toothed. The two conveying motors 402 in the same group rotate in the same direction, so that the conveying wheel 403 drives the conveyor belt 404 to operate.

[0044] An electric push rod 405 is provided on the side of the conveyor belt 404, and a matching block 406 is provided at the telescopic end of the electric push rod 405. The outside of the matching block 406 corresponds to a U-shaped seat 407. The U-shaped seat 407 is arranged on the top surface of the hydraulic lifting seat 202. The matching block 406 is matched with the inside of the U-shaped seat 407 by extending the electric push rod 405, and the operation of the conveyor belt 404 is used to drive the electric push rod 405 to move, thereby realizing the transportation of the lifting unit 2.

[0045] When in use, the carrying unit 3 is initially located outside the furnace body 1. The parts to be quenched are placed in the limiting holes 304 on the limiting plate 302. The sealed door 104 at one end of the cooling chamber 101 is opened by the hydraulic telescopic mechanism, the parts are placed on the limiting plate 302, and the carrier plate 204 is placed on the support plate 203. The hydraulic lifting seat 202 is lifted and sent into the cooling chamber 101 by an external feeding trolley. After the hydraulic lifting seat 202 falls, it slides with the slide rail 201, and the support plate 203 is raised to a high position by the hydraulic lifting seat 202. At this time, the U-shaped seat 407 corresponds to the position of the matching block 406. The matching block 406 is extended by the electric push rod 405. After the external feeding trolley exits the cooling chamber 101, the sealed door 104 is closed to put the furnace body 1 in a closed state.

[0046] Secondly, the cooling chamber 101 and the heating chamber 102 are evacuated by an external vacuum unit, and the internal pressures of the cooling chamber 101 and the heating chamber 102 are balanced, so that the blocking plate in the blocking mechanism 103 is lifted, the cooling chamber 101 and the heating chamber 102 are connected, and the two conveying motors 402 in the same group are synchronously started to rotate in the same direction, and the conveying belt 404 is driven by the conveying wheel 403 to drive the matching block 406 to move horizontally, and the matching block 406 drives the hydraulic lifting seat 202, the support plate 203 and the carrier plate 204 to move horizontally through the U-shaped seat 407, and the matching block 406 As the conveyor belt 404 moves horizontally to the farthest end, the part just passes through the feeding port and is sent to the specified position in the heating chamber 102. The hydraulic lifting seat 202 drives the carrier plate 204 to a low position and then falls on the support frame at the bottom of the heating chamber 102. Next, the hydraulic lifting seat 202 is returned to the cooling chamber 101 by the reverse operation of the conveying unit, and then the blocking mechanism 103 is closed to seal and separate the cooling chamber 101 and the heating chamber 102. The heating chamber 102 is evacuated again by an external vacuum unit. When the vacuum degree reaches a predetermined value, the heating system in the heating chamber 102 is started to heat the part.

[0047] After heating is completed, the blocking plate in the blocking mechanism 103 is lifted up, and the conveying unit is used again to send the hydraulic lifting seat 202 to the heating chamber 102, and the support plate 203 is lifted up to support the carrier plate 204, and then the conveying unit is used to reversely operate and return to the cooling chamber 101 to the initial position. After that, the support plate 203 falls to a low position, and the blocking mechanism 103 is closed. At this time, the hydraulic lifting seat 202 and the support plate 203 correspond to the position of the quenching oil tank 105, and the first hydraulic rod 205 is started to contract to drive the slide rail 201 to move downward, so that the parts move downward and are immersed in the quenching oil to start quenching.

[0048] After quenching is completed, the first hydraulic rod 205 is extended to raise the part to the initial position, and then the vacuum unit is used to evacuate the cooling chamber 101 to a preset value, and then the air release valve on the top of the cooling chamber 101 is opened to release air to restore the cooling chamber 101 to normal pressure, and the sealed door 104 at the end of the cooling chamber 101 is opened, and the part can be taken out using an external feeding trolley.

[0049] However, when the parts rise to the initial position after quenching, quenching oil will still remain on the surface of the parts and other components, and will spill everywhere when the parts are taken out. Therefore, after the parts rise to the initial position after quenching, the two conveying motors 402 on the same group of fixed rods 401 are started synchronously to rotate forward and reverse, so that the conveyor belt 404 drives the matching block 406 to rotate back and forth quickly, realizing the reciprocating motion of the parts, shaking off the quenching oil remaining on the parts and other components, and preventing spilling.

[0050] In addition, during the heating process of the parts, residues and debris will be generated on the surface of the parts, and during quenching, the residues and debris will fall into the quenching oil, resulting in more impurities in the quenching oil, and the residues and debris will adhere to the surface of the parts, affecting the quenching effect and appearance of the parts. Therefore, in order to solve the above problems, the following improvements are made:

[0051] The lifting unit 2 is provided with a filtering unit 5, and the filtering unit 5 is used to filter out the residue in the oil.

[0052] The filter unit 5 includes a filter plate 501 disposed between the slide rails 201 on both sides. When the parts are immersed in the oil, the filter plate 501 is used to block the residue in the oil.

[0053] Since the side surfaces of the slide rails 201 on both sides are respectively in contact with the inner walls of the quenching oil tank 105 on both sides, and the filter plate 501 is arranged between the slide rails 201 on both sides, and the side surfaces of the filter plate 501 are in contact with the other two inner walls of the quenching oil tank 105, and the filter plate 501 is located at the bottom of the carrier plate 204, therefore, when the parts move downward and are immersed in the quenching oil, the filter plate 501 first contacts the quenching oil to isolate the residue and debris in the quenching oil on the lower side of the filter plate 501, and the residue and debris will not float up through the filter plate 501 and contact the parts, thereby effectively preventing the residue and debris in the quenching oil from adhering to the surface of the parts during the quenching process of the parts.

[0054] In addition, as the parts are gradually immersed in the quenching oil, the oil at the top first absorbs the high temperature on the parts, and the temperature of the bottom side of the parts drops rapidly. As the parts are immersed downward, the high temperature absorption effect of the quenching oil at the upper layer gradually decreases, while the quenching oil at the lower layer still has a good high temperature absorption effect. When the parts are completely immersed in the quenching oil, the top of the parts is still located at a position where the high temperature absorption effect of the upper layer of the quenching oil is low, which will affect the quenching effect and efficiency of the top of the parts. Therefore, in order to solve the above problems, the following improvements are made:

[0055] A wedge-shaped surface 306 is formed on the top of the baffle plate 305 , and the wedge-shaped surface 306 cooperates with the horizontally moving matching block 406 to realize the up and down movement of the limiting plate 302 .

[0056] During use, when the part is completely immersed in the quenching oil, the wedge-shaped surface 306 on the top of the baffle 305 is still above the liquid surface of the quenching oil, and at this time, the U-shaped seat 407 and the matching block 406 are separated, and the conveying motors 402 on both sides of the conveyor belt 404 are started synchronously, so that the matching block 406 runs to a position close to the wedge-shaped surface 306, and then the two conveying motors 402 in the same group of fixed rods 401 are slowly reciprocated, so that the conveyor belt 404 drives the matching block 406 to reciprocate slowly. At this time, the matching block 406 reciprocates along the wedge-shaped surface 306 on the top of one of the baffles 305. When the wedge-shaped surface 306 moves from the bottom to the top, the baffle 305 drives the limit plate 302 to move downward, and the buffer spring 303 is compressed. When the matching block 406 moves from the top to the bottom of the wedge-shaped surface 306, the buffer spring 303 is reset, and the baffle 305 drives the limit plate 302 to move upward. Therefore, the slow reciprocating motion of the matching block 406 is used to realize the up and down reciprocating motion of the limit plate 302, and the quenching oil at the top and bottom is stirred, so that the upper and lower layers of quenching oil with a large temperature difference are mixed in the vertical direction, so that the temperature of the quenching oil on the upper and lower sides is uniform, thereby improving the quenching effect and efficiency of the parts.

[0057] In addition, after the quenching oil is used for a long time, a lot of residues and debris will remain in the quenching oil tank 105, and some of the residues will settle at the bottom of the quenching oil tank 105, which is difficult to clean out. Therefore, the following improvements are made:

[0058] Two filter plates 501 are symmetrically arranged, and the sides of the two filter plates 501 that are away from each other are movably connected to the slide rails 201 on both sides. A second hydraulic rod 502 is movably arranged between the bottom surface of the filter plate 501 on each side and the inner side surface of the quenching oil tank 105. The extension and retraction of the second hydraulic rods 502 on both sides respectively drive the filter plates 501 on both sides to swing, so as to realize the opening and closing of the two filter plates 501.

[0059] After the heat treatment is completed, the hydraulic lifting seat 202 and the carrier plate 204 are taken out of the cooling chamber 101, and the first hydraulic rod 205 is started, so that the first hydraulic rod 205 drives the slide rail 201 to reciprocate up and down, and at the same time, the second hydraulic rods 502 on both sides are started to drive the opposite sides of the filter plates 501 on both sides to swing up and down, so that the quenching oil is stirred, and the residues and debris in the quenching oil are stirred, and at the same time, the residues and debris settled at the bottom of the quenching oil tank 105 float up, and the filter plate 501 stops after the specified time of swinging, and the filter plate 501 is just in a vertical state when it stops swinging, and the opening between the filter plates 501 on both sides reaches the maximum, and then the first hydraulic rod 205 is used to shrink to drive the filter plate 501 to move downward, and the bottom of the filter plate 501 contacts the quenching oil tank 1 05, and the second hydraulic rod 502 gradually extends while the first hydraulic rod 205 gradually contracts, so that the opposite sides of the filter plates 501 on both sides gradually come together. When the first hydraulic rod 205 contracts to the bottom, the filter plates 501 on both sides are just in a horizontal state. At this time, the opposite sides of the filter plates 501 on both sides just correspond to each other and fit together. At this time, the residues and debris in the quenching oil are collected on the surface of the filter plates 501, and then the extension of the first hydraulic rod 205 is used to drive the two filter plates 501 in a horizontal state to move upward, so that the residues and debris on the surface of the filter plates 501 can be lifted above the liquid surface of the oil, and the staff can clean the residues and debris collected on the filter plates 501, thereby realizing the cleaning of the residues and debris in the quenching oil.

[0060] However, during the quenching process of parts, when the filter plate 501 moves downward to block the residue and debris, and when the filter plate 501 is used to remove the residue and debris in the quenching oil, the residue and debris can easily cause the filter holes on the filter plate 501 to be blocked. Therefore, after the quenching of the parts is completed and the quenching oil in the quenching oil tank 105 is completely discharged, the filter holes of the filter plate 501 are cleaned.

[0061] When cleaning, first take out the hydraulic lifting seat 202 and the carrier plate 204 from the cooling chamber 101, use the conveying unit to move the matching blocks 406 on both sides to the axial position with the filter plate 501, and then use the electric push rods 405 on both sides to extend so that the matching blocks 406 on both sides move toward the center of the filter plate 501, and use the reciprocating extension and contraction of the second hydraulic rod 502 to drive the filter plate 501 to swing. At this time, the horizontal position of the filter plate 501 is the lowest position reached when the filter plate 501 swings. When the filter plate 501 swings upward, it can collide slightly with the matching blocks 406, causing the filter plate 501 to vibrate, and the filter plate 501 and the filter holes thereon are cleaned. Example 2

[0062] This embodiment provides a heat treatment process for applying the above vacuum quenching furnace in the production of a starter non-return device, comprising the following steps:

[0063] S1, open one end of the cooling chamber 101, place the carrying unit 3 with parts on the support plate 203, use the external feeding trolley to place the hydraulic lifting seat 202 on the slide rail 201 in the cooling chamber 101, and lift the parts to a high position, and then close the furnace body 1;

[0064] S2, start the external vacuum unit to draw vacuum from the cooling chamber 101 and the heating chamber 102 until the pressure of the two chambers is balanced, open the blocking mechanism 103, start the conveying unit to drive the carrying unit 3 to convey the parts to the heating chamber 102, and lower the hydraulic lifting seat 202 to place the carrying unit 3 and the parts thereon on the carrying rack in the heating chamber 102;

[0065] S3, resetting the hydraulic lift seat 202 to the initial position in the cooling chamber 101, closing the blocking mechanism 103, and using an external vacuum unit to draw the vacuum degree of the heating chamber 102 to the heating start condition and then starting the heating;

[0066] S4, after heating is completed, the blocking mechanism 103 is opened, and the hydraulic lifting seat 202 is used to drive the support plate 203 to move to the heating chamber 102 and to the bottom of the carrying unit 3 by the conveying unit, and the hydraulic lifting seat 202 is used to drive the support plate 203 to rise to support the parts and return them to the cooling chamber 101 by the conveying unit, and the carrying unit 3 is dropped to the low position, and the blocking mechanism 103 is closed;

[0067] S5, moving the slide rail 201 downward, immersing the parts on the carrying unit 3 in the quenching oil in the quenching oil tank 105 for quenching;

[0068] S6. After quenching, the parts rise to the initial state, and the vacuum unit is used to evacuate the cooling chamber 101 to a specified value. After waiting for a preset time, the air release valve on the top of the cooling chamber 101 is opened, the cooling chamber 101 is opened, and the parts are taken out using an external feeding trolley.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vacuum quenching furnace, the vacuum quenching furnace being suitable for heat treatment of a starter non-return device, the vacuum quenching furnace comprising a furnace body (1), a lifting unit (2), a bearing unit (3) and a conveying unit, the furnace body (1) comprising a cooling chamber (101) and a heating chamber (102), a blocking mechanism (103) being provided at the junction between the cooling chamber (101) and the heating chamber (102), a quenching oil tank (105) being provided at the bottom of the cooling chamber (101), and characterized in that: The lifting unit (2) is provided with a filtering unit (5); The lifting unit (2) is arranged at the bottom of the cooling chamber (101), the carrying unit (3) is arranged at the top of the lifting unit (2), and the conveying unit is arranged on the inner wall of the cooling chamber (101); The lifting unit (2) comprises two symmetrically distributed slide rails (201), a hydraulic lifting seat (202) and a support plate (203); The two slide rails (201) are symmetrically slidably fitted on both sides between the first partition plate (106) and the second partition plate (107); the hydraulic lifting seat (202) is slidably fitted on the top of the slide rails (201); the support plate (203) is arranged at the lifting end of the hydraulic lifting seat (202); and the surface of the support plate (203) is clamped with a carrier plate (204); First hydraulic rods (205) are provided on both sides of the bottom of the quenching oil tank (105), and the top telescopic ends of the first hydraulic rods (205) on both sides are fixedly connected to the bottoms of the slide rails (201) on both sides respectively; The bearing unit (3) comprises two symmetrically distributed limiting rods (301), the limiting rods (301) are movably sleeved with limiting plates (302), the limiting rods (301) are sleeved with buffer springs (303) at the bottom of the limiting plates (302), baffles (305) are provided at both ends of the limiting plates (302), and a wedge-shaped surface (306) is provided on the top of the baffles (305); The two limiting rods (301) are respectively arranged on two sides of the carrier plate (204), and the limiting plates (302) are evenly provided with limiting holes (304); The transmission unit comprises two groups of symmetrically distributed fixed rods (401), a transmission motor (402) is provided at the end of the fixed rod (401), a transmission wheel (403) is provided on the output shaft of the transmission motor (402), two transmission wheels (403) in the same group are connected by a transmission belt (404), an electric push rod (405) is provided on the side of the transmission belt (404), and a matching block (406) is provided at the telescopic end of the electric push rod (405); Each set of fixing rods (401) includes two fixing rods (401), and the two sets of fixing rods (401) are respectively arranged on two sides of the cooling chamber (101); the outside of the matching block (406) is correspondingly matched with a U-shaped seat (407), and the U-shaped seat (407) is arranged on the top surface of the hydraulic lifting seat (202); The filter unit (5) comprises a filter plate (501) arranged between the slide rails (201) on both sides, two filter plates (501) are symmetrically arranged, and the two sides of the two filter plates (501) that are away from each other are movably connected to the slide rails (201) on both sides, and a second hydraulic rod (502) is movably arranged between the bottom surface of the filter plate (501) on each side and the inner side surface of the quenching oil tank (105).

2. The vacuum quenching furnace according to claim 1, characterized in that: Both ends of the cooling chamber (101) are movably provided with sealing doors (104); a first partition (106) is provided at the feed end of the cooling chamber (101); a feed port is provided in the middle of the first partition (106); a second partition (107) corresponding to the blocking mechanism (103) is provided at the junction between the cooling chamber (101) and the heating chamber (102); a feed port is provided in the middle of the second partition (107).

3. A heat treatment process of a vacuum quenching furnace, wherein the heat treatment process utilizes the vacuum quenching furnace as claimed in claim 1 to achieve heat treatment of a starter non-return device, characterized in that: The following steps are involved: S1, opening one end of the cooling chamber (101), placing the carrying unit (3) with the parts on it on the support plate (203), using an external feeding trolley to place the hydraulic lifting seat (202) on the slide rail (201) in the cooling chamber (101), and raising the parts to a high position, and then closing the furnace body (1); S2, starting the external vacuum unit to draw the vacuum degree of the cooling chamber (101) and the heating chamber (102) until the pressure of the two chambers is balanced, opening the blocking mechanism (103), starting the conveying unit to drive the carrying unit (3) to convey the parts to the heating chamber (102), and lowering the hydraulic lifting seat (202) so that the carrying unit (3) and the parts thereon are placed on the carrying rack in the heating chamber (102); S3, resetting the hydraulic lift seat (202) to the initial position in the cooling chamber (101), closing the blocking mechanism (103), and using an external vacuum unit to draw the vacuum degree of the heating chamber (102) to a heating start condition before starting heating; S4, after heating is completed, the blocking mechanism (103) is opened, and the hydraulic lifting seat (202) is used to drive the support plate (203) to move to the heating chamber (102) and to the bottom of the carrying unit (3), and the hydraulic lifting seat (202) is used to drive the support plate (203) to rise to support the parts and return them to the cooling chamber (101) by using the conveying unit, and the carrying unit (3) is dropped to a low position, and the blocking mechanism (103) is closed; S5, moving the slide rail (201) downward to immerse the parts on the carrying unit (3) in the quenching oil in the quenching oil tank (105) for quenching; S6. After quenching is completed, the part rises to the initial state, and the vacuum unit is used to evacuate the cooling chamber (101) to a specified value. After waiting for a preset time, the air release valve at the top of the cooling chamber (101) is opened, the cooling chamber (101) is opened, and the part is taken out using an external feeding trolley.

4. Application of the vacuum quenching furnace as described in any one of claims 1 to 2 in the production of starter check valves.

Images