Lifting type lead frame preheating plate mechanism

Abstract

The utility model relates to a lifting type lead frame preheating plate mechanism, and relates to the field of packaging systems. The lifting type lead frame preheating plate mechanism comprises a lead frame preheating plate assembly, a supporting assembly, a lifting assembly and a supporting plate. The supporting assembly comprises a first guide column, an elastic piece and a supporting seat, one end of the supporting seat is installed on the supporting plate, the other end of the supporting seat is in sliding fit with the first guide column, and the elastic piece is installed between the supporting seat and the first guide column. One end, deviating from the supporting seat, of the first guide column is connected with the lead frame preheating plate assembly; the lifting assembly comprises a driving piece and a second guide column, the second guide column is connected with the lead frame preheating plate assembly, and the driving piece is installed on the supporting plate and is in transmission connection with the second guide column so as to drive the second guide column to move in the direction close to the supporting plate or away from the supporting plate; and when the second guide column moves towards the supporting plate, the elastic piece is compressed and deformed. The technical problem of low production efficiency of the packaging system in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of packaging systems, and in particular to a lifting lead frame preheating plate mechanism. Background Art

[0002] Before semiconductor chips are packaged, the lead frame is preheated. The existing packaging system uses a fixed lead frame preheating plate. Figure 1 Four columns are installed on the base plate, a heat insulation board is installed on the columns, a preheating base plate is installed on the heat insulation board, a lead frame preheating plate, a first positioning block and a second positioning block are installed on the preheating base plate, two positioning columns are installed on the lead frame preheating plate, and two heating rods are installed in the side holes of the preheating base plate.

[0003] The existing lead frame preheating plate and loading robot are independent mechanisms, and the lead frame preheating plate is fixed. During the preheating process, the lead frame is often transported from a conveyor belt to the lead frame preheating plate by a loading robot, where it is preheated for a period of time to reach the rated temperature. The loading robot then transports the preheated lead frame to another conveyor belt and then to the packaging area for processing. The preheating and transportation processes are carried out in two steps, resulting in low efficiency in the packaging system. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a lifting lead frame preheating plate mechanism to alleviate the technical problem of low production efficiency of the packaging system existing in the prior art.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] The lifting type lead frame preheating plate mechanism provided by the utility model comprises a lead frame preheating plate assembly, a support assembly, a lifting assembly and a support plate;

[0007] The support assembly includes a first guide post, an elastic member, and a support seat, one end of the support seat is mounted on the support plate, and the other end is slidably engaged with the first guide post, and the elastic member is mounted between the support seat and the first guide post; the end of the first guide post facing away from the support seat is connected to the lead frame preheating plate assembly;

[0008] The lifting assembly includes a driving member and a second guide post, the second guide post is connected to the lead frame preheating plate assembly, the driving member is mounted on the support plate and is in transmission connection with the second guide post to drive the second guide post to move toward or away from the support plate;

[0009] When the second guide post moves toward the support plate, the elastic member is compressed and deformed.

[0010] Furthermore, the lifting assembly further includes a guide joint, one end of which is mounted on the support plate, and the other end of which is slidably engaged with the second guide column.

[0011] Furthermore, the lifting assembly further comprises a transmission assembly and a connecting plate, one end of the transmission assembly is connected to the driving end of the driving member, and the other end is connected to the second guide column;

[0012] The connecting plate is connected to the second guide pillar and the lead frame preheating plate assembly, and a cross-sectional area of ​​the connecting plate is larger than a cross-sectional area of ​​the second guide pillar.

[0013] Furthermore, the lifting lead frame preheating plate mechanism also includes a sensing component, which is installed on the support plate and is used to detect the position of the lead frame preheating plate assembly.

[0014] Furthermore, the sensing assembly includes a support frame, a light shield and two sensors;

[0015] The support frame is mounted on the support plate, and the two sensors are mounted on the support frame and spaced apart in the vertical direction;

[0016] The shading plate is installed on the transmission component, and the sensor is opposite to the shading plate.

[0017] Furthermore, the transmission assembly includes a connecting rod and a sleeve, one end of the connecting rod is connected to the second guide column, the other end is equipped with the visor, and the middle part of the connecting rod is clamped with the outer wall of the sleeve;

[0018] The sleeve member is connected to the driving end of the driving member.

[0019] Furthermore, the connecting rod includes a first connecting section, a second connecting section, and a third connecting section, the second connecting section and the third connecting section are mounted on one end of the first connecting section, and a gap is left between the second connecting section and the third connecting section; the outer wall of the sleeve is provided with a snap-fit ​​groove, and the snap-fit ​​groove extends along the circumference of the sleeve;

[0020] The first connecting section is connected to the second guide post, the sleeve is inserted into the gap, and the two side walls of the clamping groove are respectively in contact with the upper surface and the lower surface of the second connecting section and the third connecting section;

[0021] The second connecting section is equipped with the sunshade.

[0022] Furthermore, the lead frame preheating plate assembly includes a heat-resisting plate, a preheating base plate and a preheating plate;

[0023] The preheating bottom plate is located between the heat-resisting plate and the preheating plate, and a surface of the heat-resisting plate facing away from the preheating bottom plate is connected to the second guide pillar.

[0024] Furthermore, a thermocouple is installed on the side wall of the preheating bottom plate, and a thermal protector is installed on the thermocouple.

[0025] Furthermore, a stopper is installed on the side wall of the preheating bottom plate where the thermocouple is installed, and a positioning block is installed on the side wall adjacent to the side wall where the thermocouple is installed; and a heating plate is installed on the bottom wall of the preheating bottom plate.

[0026] Based on the above technical solutions, the technical effects that can be achieved by this utility model are analyzed as follows:

[0027] The lifting lead frame preheating plate mechanism provided by the utility model includes a lead frame preheating plate assembly, a support assembly, a lifting assembly and a support plate; the support assembly includes a first guide column, an elastic member and a support seat, one end of the support seat is installed on the support plate, and the other end is slidably matched with the first guide column, and an elastic member is installed between the support seat and the first guide column; the end of the first guide column facing away from the support seat is connected to the lead frame preheating plate assembly; the lifting assembly includes a driving member and a second guide column, the second guide column is connected to the lead frame preheating plate assembly, the driving member is installed on the support plate and is transmission-connected to the second guide column to drive the second guide column to move toward or away from the support plate; when the second guide column moves toward the support plate, the elastic member is compressed and deformed.

[0028] In the lifting lead frame preheating plate mechanism, the driving member is telescopically moved to drive the second guide post to move up and down. The second guide post is connected to the bottom of the lead frame preheating plate assembly, driving the lead frame preheating plate assembly to move up and down. When the lead frame preheating plate assembly descends, the elastic member of the support assembly is in a compressed state. When the lead frame preheating plate assembly rises, the elastic member is in a released state. The support assembly supports and guides the lead frame preheating plate assembly.

[0029] The upper portion of the lifting lead frame preheating plate mechanism is a lead frame preheating plate assembly. A support assembly is installed below the lead frame preheating plate assembly. The lead frame preheating plate assembly is connected to the support plate by a first guide post, an elastic member, and a support seat in the support assembly, thereby supporting and guiding the lead frame preheating plate assembly. A lifting assembly is also installed below the lead frame preheating plate assembly. The lifting and lowering of the lead frame preheating plate assembly is achieved by a driving member and a second guide post in the lifting assembly. When using the lifting lead frame preheating plate mechanism, while the loading robot grabs the lead frame to transport it to the plastic encapsulation press, the lifting lead frame preheating plate mechanism rises to preheat the lead frame, achieving simultaneous transportation and preheating of the lead frame and shortening the lead frame preheating time. When the loading robot grabs the plastic encapsulation resin for transport, the lifting lead frame preheating plate mechanism descends to prevent the resin from softening, thereby improving the efficiency of the packaging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the preheating plate provided in the background technology;

[0032] Figure 2 Schematic diagram of the structure of the lifting lead frame preheating plate mechanism provided in the embodiment of the present application Figure 1 ;

[0033] Figure 3 Schematic diagram of the structure of the lifting lead frame preheating plate mechanism provided in the embodiment of the present application Figure 2 ;

[0034] Figure 4 This is a schematic diagram of the structure of the connecting rod in the lifting lead frame preheating plate mechanism provided in an embodiment of the present application.

[0035] icon:

[0036] 1-base plate; 2-column; 3-insulation plate; 4-preheating base plate; 5-preheating plate; 6-first positioning block; 7-second positioning block; 8-positioning column; 9-heating rod;

[0037] 12-lead frame preheating plate assembly; 13-support assembly; 14-lifting assembly; 15-support plate; 16-support seat; 17-elastic member; 18-first guide column; 19-driving member; 20-connecting rod; 21-light shielding plate; 22-support frame; 23-sensor; 24-guide joint; 25-second guide column; 26-connecting plate; 27-heat resistance plate; 28-heating plate; 29-preheating base plate; 30-stop block; 31-thermal protector; 32-positioning block; 33-thermocouple; 34-preheating plate; 35-set piece; 36-first connecting section; 37-second connecting section; 38-third connecting section. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0040] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0041] See also Figure 1, four columns 2 are installed on the base plate 1, a heat insulation board 3 is installed on the column 2, a preheating base plate 4 is installed on the heat insulation board 3, a lead frame preheating plate 5, a first positioning block 6 and a second positioning block 7 are installed on the preheating base plate 4, two positioning columns 8 are installed on the lead frame preheating plate 5, and two heating rods 9 are installed in the side holes of the preheating base plate 4. The existing lead frame preheating plate 5 and the loading robot are independent mechanisms, and the lead frame preheating plate 5 is fixed; during the transportation of the lead frame in the preheating process, the loading robot often transports the lead frame from the conveyor belt to the lead frame preheating plate 5 for preheating for a period of time to reach the rated temperature, and then the loading robot transports the preheated lead frame to another conveyor belt and transports it to the packaging location for processing; the preheating and transportation processes are divided into two steps, resulting in low efficiency of the packaging system.

[0042] In view of this, see Figures 2 to 4 The lifting lead frame preheating plate mechanism provided by the embodiment of the present invention includes a lead frame preheating plate assembly 12, a support assembly 13, a lifting assembly 14 and a support plate 15; the support assembly 13 includes a first guide column 18, an elastic member 17 and a support seat 16, one end of the support seat 16 is installed on the support plate 15, and the other end is slidably matched with the first guide column 18, and an elastic member 17 is installed between the support seat 16 and the first guide column 18; the end of the first guide column 18 facing away from the support seat 16 is connected to the lead frame preheating plate assembly 12; the lifting assembly 14 includes a driving member 19 and a second guide column 25, the second guide column 25 is connected to the lead frame preheating plate assembly 12, the driving member 19 is installed on the support plate 15 and is transmission-connected to the second guide column 25 to drive the second guide column 25 to move toward or away from the support plate 15; when the second guide column 25 moves toward the direction close to the support plate 15, the elastic member 17 is compressed and deformed.

[0043] Specifically, in this embodiment, two support assemblies 13 are provided, spaced apart along the length of the lead frame preheating plate assembly 12, with the lifting assembly 14 located between the two support assemblies 13. Preferably, the elastic member 17 is configured as a spring, which is sleeved around the outer wall of the first guide post 18 and abuts against the support base 16. The driving member 19 is configured as a cylinder.

[0044] In the lifting lead frame preheating plate mechanism, the driving member 19 is extended and retracted to drive the second guide column 25 to rise and fall. The second guide column 25 is connected to the bottom of the lead frame preheating plate assembly 12, driving the lead frame preheating plate assembly 12 to rise and fall; when the lead frame preheating plate assembly 12 descends, the elastic member 17 of the support assembly 13 is in a compressed state, and when the lead frame preheating plate assembly 12 rises, the elastic member 17 is in a released state. The support assembly 13 supports and guides the lead frame preheating plate assembly 12. The upper portion of the lift-type lead frame preheating plate mechanism is a lead frame preheating plate assembly 12. A support assembly 13 is installed below the lead frame preheating plate assembly 12. The lead frame preheating plate assembly 12 is connected to the support plate 15 via a first guide post 18, an elastic member 17, and a support seat 16 in the support assembly 13, thereby supporting and guiding the lead frame preheating plate assembly 12. A lift assembly 14 is also installed below the lead frame preheating plate assembly 12. The lift assembly 14 is used to raise and lower the lead frame preheating plate assembly 12 via a drive member 19 and a second guide post 25 in the lift assembly 14. When using the lift-type lead frame preheating plate mechanism, while the loading robot grabs the lead frame to transport it to the plastic encapsulation press, the lift-type lead frame preheating plate mechanism rises to preheat the lead frame, achieving simultaneous transport and preheating of the lead frame and shortening the lead frame preheating time. While the loading robot grabs the plastic encapsulation resin for transport, the lift-type lead frame preheating plate mechanism descends to prevent the resin from softening, thereby improving the efficiency of the packaging system.

[0045] The following is a detailed description of the structure and shape of the lifting lead frame preheating plate mechanism:

[0046] In an optional solution of the embodiment of the present invention, the lifting assembly 14 further includes a guide joint 24 , one end of which is mounted on the support plate 15 , and the other end of which is slidably engaged with the second guide column 25 .

[0047] Specifically, the cross-section of the second guide pillar 25 is set to be circular, and the axis of the second guide pillar 25 is set along the vertical direction; the bottom end of the second guide pillar 25 is inserted into the guide joint 24 and slides with the guide joint 24; the top end of the second guide pillar 25 is connected to the lead frame preheating plate assembly 12.

[0048] The guide joint 24 is in sliding cooperation with the second guide post 25 . The guide joint 24 is used to guide the moving direction of the second guide post 25 to prevent the second guide post 25 from tilting.

[0049] In an optional scheme of an embodiment of the present utility model, the lifting assembly 14 also includes a transmission assembly and a connecting plate 26, one end of the transmission assembly is connected to the driving end of the driving member 19, and the other end is connected to the second guide column 25; the connecting plate 26 is connected to the second guide column 25 and the lead frame preheating plate assembly 12, and the cross-sectional area of ​​the connecting plate 26 is larger than the cross-sectional area of ​​the second guide column 25.

[0050] Specifically, the cross section of the connecting plate 26 can be set to be square or circular, and the connecting plate 26 protrudes from the second guide pillar 25 to facilitate the connection between the connecting plate 26 and the lead frame preheating plate assembly 12.

[0051] The transmission assembly enables the driving member 19 to drive the second guide pillar 25 to move up and down, and the connecting plate 26 enables the second guide pillar 25 to be connected to the lead frame preheating plate assembly 12.

[0052] In an optional solution of the embodiment of the present invention, the lifting lead frame preheating plate mechanism further includes a sensing component, which is mounted on the support plate 15 and is used to detect the position of the lead frame preheating plate assembly 12 .

[0053] Specifically, in this embodiment, the sensing component determines the position of the lead frame preheating plate assembly 12 by detecting the position of the transmission component; and then determines whether the lead frame preheating plate assembly 12 is within the rated stroke range; if the lead frame preheating plate assembly 12 exceeds the rated stroke range, an alarm is issued and the driving component 19 stops running.

[0054] The sensing component detects the position of the lead frame preheating plate assembly 12 to determine whether the lead frame preheating plate assembly 12 rises or falls beyond the rated stroke range, thereby preventing the manipulator from being unable to cooperate with the lead frame preheating plate assembly 12 normally.

[0055] In an optional solution of an embodiment of the present utility model, the sensing component includes a support frame 22, a sunshade 21 and two sensors 23; the support frame 22 is installed on the support plate 15, and the two sensors 23 are installed on the support frame 22 and are spaced apart in the vertical direction; the sunshade 21 is installed on the transmission component, and the sensor 23 is opposite to the sunshade 21.

[0056] Specifically, two sensors 23 are provided, and the two sensors 23 are spaced apart in the vertical direction. The upper sensor 23 is used to identify the highest rising position of the sun shading plate 21; when the transmission component rises, it drives the sun shading plate 21 to rise. When the rising distance of the sun shading plate 21 is too large and the sensor 23 cannot identify the sun shading plate 21, the driving member 19 stops running and alarms; the lower sensor 23 is used to identify the lowest descending position of the sun shading plate 21; when the transmission component descends, it drives the sun shading plate 21 to descend. When the descending distance of the sun shading plate 21 is too large and the sensor 23 cannot identify the sun shading plate 21, the driving member 19 stops running and alarms.

[0057] The support frame 22 is used to fix the support sensor 23 , and the light shielding plate 21 and the sensor 23 are arranged relative to each other so that the sensor 23 can be used to identify whether the transmission component exceeds the travel range.

[0058] In an optional scheme of an embodiment of the present utility model, the transmission assembly includes a connecting rod 20 and a sleeve 35, one end of the connecting rod 20 is connected to the second guide column 25, and the other end is equipped with a light shielding plate 21, and the middle part of the connecting rod 20 is clamped with the outer wall of the sleeve 35; the sleeve 35 is connected to the driving end of the driving member 19.

[0059] Specifically, the cross-section of the sleeve 35 is set to be annular, and the middle part is sleeved on the driving shaft of the driving member 19, so that the sleeve 35 can be driven to rise and fall when the cylinder is extended and retracted; the sleeve 35 is clamped with the connecting rod 20, so that the sleeve 35 drives the connecting rod 20 to rise and fall; the connecting rod 20 is connected to the second guide column 25, so that the connecting rod 20 drives the second guide column 25 to rise and fall.

[0060] The connecting rod 20 connects the transmission assembly with the sunshade 21 and the second guide column 25 ; the sleeve 35 connects the transmission assembly with the driving member 19 .

[0061] In the optional solution of the embodiment of the present utility model, see Figure 4 The connecting rod 20 includes a first connecting section 36, a second connecting section 37 and a third connecting section 38. The second connecting section 37 and the third connecting section 38 are installed at one end of the first connecting section 36, and a gap is left between the second connecting section 37 and the third connecting section 38; the outer wall of the sleeve 35 is provided with a snap-fit ​​groove, and the snap-fit ​​groove extends along the circumference of the sleeve 35; the first connecting section 36 is connected to the second guide column 25, the sleeve 35 is inserted in the gap, and the two side walls of the snap-fit ​​groove are respectively in contact with the upper surface and lower surface of the second connecting section 37 and the third connecting section 38; the second connecting section 37 is installed with a light shielding plate 21.

[0062] Specifically, the second connecting section 37 and the third connecting section 38 are of the same length, and the sleeve 35 is inserted into the gap between the second connecting section 37 and the third connecting section 38. The upper sidewall of the engaging groove abuts the upper surfaces of the second connecting section 37 and the third connecting section 38, and the lower sidewall of the engaging groove abuts the lower surfaces of the second connecting section 37 and the third connecting section 38, thereby achieving the engaging connection between the connecting rod 20 and the sleeve 35. During installation, the sleeve 35 can be inserted into the gap from the end of the gap facing away from the first connecting section 36. Preferably, the first connecting section 36, the second connecting section 37, and the third connecting section 38 are integrally formed.

[0063] The first connecting section 36 connects the connecting rod 20 to the second guide column 25 , and the second connecting section 37 and the third connecting section 38 connect the connecting rod 20 to the sleeve 35 .

[0064] In an optional solution of an embodiment of the present invention, the lead frame preheating plate assembly 12 includes a heat-resistant plate 27, a preheating base plate 29 and a preheating plate 34; the preheating base plate 29 is located between the heat-resistant plate 27 and the preheating plate 34, and the surface of the heat-resistant plate 27 facing away from the preheating base plate 29 is connected to the second guide column 25.

[0065] Specifically, the heat-resisting plate 27 , the preheating bottom plate 29 and the preheating plate 34 are laid in sequence.

[0066] The heat-resisting plate 27 realizes a heat-insulating effect, and the preheating bottom plate 29 and the preheating plate 34 realize a preheating effect.

[0067] In an optional solution of the embodiment of the present utility model, a thermocouple 33 is installed on the side wall of the preheating bottom plate 29 , and a thermal protector 31 is installed on the thermocouple 33 .

[0068] The thermocouple 33 achieves the effect of preheating the preheating base plate 29 , and the thermal protector 31 is used to protect the thermocouple 33 .

[0069] In an optional solution of the embodiment of the present invention, the side wall of the preheating bottom plate 29 on which the thermocouple 33 is installed is installed with a stopper 30, and the side wall adjacent to the side wall on which the thermocouple 33 is installed is installed with a positioning block 32; the bottom wall of the preheating bottom plate 29 is installed with a heating plate 28.

[0070] The stopper 30 and the positioning block 32 achieve a positioning effect, and the heating plate 28 achieves a preheating effect.

[0071] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0072] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A lifting lead frame preheating plate mechanism, characterized in that: include: A lead frame preheating plate assembly (12), a support assembly (13), a lifting assembly (14) and a support plate (15); The support assembly (13) includes a first guide post (18), an elastic member (17) and a support seat (16); one end of the support seat (16) is mounted on the support plate (15), and the other end is slidably engaged with the first guide post (18), and the elastic member (17) is mounted between the support seat (16) and the first guide post (18); the end of the first guide post (18) facing away from the support seat (16) is connected to the lead frame preheating plate assembly (12); The lifting assembly (14) includes a driving member (19) and a second guide column (25), wherein the second guide column (25) is connected to the lead frame preheating plate assembly (12), and the driving member (19) is mounted on the support plate (15) and is in transmission connection with the second guide column (25) to drive the second guide column (25) to move toward or away from the support plate (15); When the second guide column (25) moves in a direction close to the support plate (15), the elastic member (17) is compressed and deformed.

2. The lifting lead frame preheating plate mechanism according to claim 1, characterized in that: The lifting assembly (14) further comprises a guide joint (24), one end of which is mounted on the support plate (15), and the other end of which is in sliding engagement with the second guide column (25).

3. The lifting lead frame preheating plate mechanism according to claim 1, characterized in that: The lifting assembly (14) further includes a transmission assembly and a connecting plate (26), one end of the transmission assembly being connected to the driving end of the driving member (19), and the other end being connected to the second guide column (25); The connecting plate (26) is connected to the second guide pillar (25) and the lead frame preheating plate assembly (12), and the cross-sectional area of ​​the connecting plate (26) is larger than the cross-sectional area of ​​the second guide pillar (25).

4. The lifting lead frame preheating plate mechanism according to claim 3, characterized in that: The lifting lead frame preheating plate mechanism further comprises a sensing component, which is mounted on the support plate (15) and is used to detect the position of the lead frame preheating plate component (12).

5. The lifting lead frame preheating plate mechanism according to claim 4, characterized in that: The sensing component comprises a support frame (22), a light shielding plate (21) and two sensors (23); The support frame (22) is mounted on the support plate (15), and the two sensors (23) are mounted on the support frame (22) and spaced apart in a vertical direction; The shading plate (21) is mounted on the transmission assembly, and the sensor (23) is opposite to the shading plate (21).

6. The lifting lead frame preheating plate mechanism according to claim 5, characterized in that: The transmission assembly comprises a connecting rod (20) and a sleeve (35), one end of the connecting rod (20) is connected to the second guide column (25), the other end is provided with the light shielding plate (21), and the middle portion of the connecting rod (20) is engaged with the outer wall of the sleeve (35); The sleeve member (35) is connected to the driving end of the driving member (19).

7. The lifting lead frame preheating plate mechanism according to claim 6, characterized in that: The connecting rod (20) comprises a first connecting section (36), a second connecting section (37) and a third connecting section (38), wherein the second connecting section (37) and the third connecting section (38) are mounted on one end of the first connecting section (36), and a gap is left between the second connecting section (37) and the third connecting section (38); a clamping groove is provided on the outer wall of the sleeve (35), and the clamping groove extends along the circumference of the sleeve (35); The first connecting section (36) is connected to the second guide column (25), the sleeve (35) is inserted into the gap, and the two side walls of the clamping groove are respectively in contact with the upper surface and the lower surface of the second connecting section (37) and the third connecting section (38); The second connecting section (37) is equipped with the light shielding plate (21).

8. The lifting lead frame preheating plate mechanism according to claim 1, characterized in that: The lead frame preheating plate assembly (12) includes a heat-resisting plate (27), a preheating base plate (29) and a preheating plate (34); The preheating bottom plate (29) is located between the heat-resisting plate (27) and the preheating plate (34), and the surface of the heat-resisting plate (27) facing away from the preheating bottom plate (29) is connected to the second guide column (25).

9. The lifting lead frame preheating plate mechanism according to claim 8, characterized in that: A thermocouple (33) is installed on the side wall of the preheating bottom plate (29), and a thermal protector (31) is installed on the thermocouple (33).

10. The lifting lead frame preheating plate mechanism according to claim 9, characterized in that: The side wall of the preheating bottom plate (29) on which the thermocouple (33) is installed is installed with a stopper (30), and the side wall adjacent to the side wall on which the thermocouple (33) is installed is installed with a positioning block (32); the bottom wall of the preheating bottom plate (29) is installed with a heating plate (28).

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