Door interlocking mechanism

Abstract

A door interlock mechanism comprises a bracket, an upper high-voltage switch, a lower high-voltage switch and a weak-voltage switch are installed on the bracket, an upper pull rod and a lower pull rod are installed on the bracket, the upper pull rod is arranged between the upper high-voltage switch and the lower high-voltage switch and can reciprocate horizontally, the upper high-voltage switch contact is arranged at the bottom of the front side of the upper high-voltage switch, the lower high-voltage switch contact is arranged at the top of the front side of the lower high-voltage switch, the top of the upper pull rod has an upper convex rib for triggering the upper high-voltage switch, the bottom of the upper pull rod has a lower convex rib for triggering the lower high-voltage switch, and the lower convex rib and the upper convex rib can respectively trigger the lower high-voltage switch and the upper high-voltage switch in sequence, and the lower pull rod is used to trigger the weak-voltage switch. The door interlock mechanism can control the action sequence of the upper high-voltage switch and the lower high-voltage switch in sequence through the reciprocating movement of the pull rod, thereby ensuring that the action is performed in a normal closing sequence.

Description

Technical Field

[0001] The invention relates to a door interlocking mechanism. Background Art

[0002] Due to safety regulations, the interlocking components of the steam-microwave all-in-one must close the lower power switch first and then the upper power switch when the product is closed and ready to start working; when the product is finished cooking and the user opens the door, the upper power switch must be disconnected first and then the lower power switch. Otherwise, if the order of the two power switches is wrong, the product will automatically start the protection program and blow up the fuse on the electronic control board to prevent the product from working. At the same time, since the steam-microwave all-in-one has a microwave function, according to safety regulations, for products with microwave functions, there must be at least one power switch that cannot be touched by fingers.

[0003] The interlocking components of the steam and microwave integrated machine on the market are as follows: Figure 5 As shown, there are several problems: 1: The two high-voltage switches a are controlled by two pull rods b respectively. In the actual production and assembly process, it is inevitable that the size errors of the two pull rods and the assembly errors of the entire interlocking assembly will occur, which may cause the upper and lower high-voltage switches to fail to close in the closing order of first lower and then upper, thereby causing the fuse to burst. 2: The three micro switches all produce an outward thrust on the door body. In addition, when steam cooking, the steam pressure of the inner pot will also produce an outward thrust on the door body. The combined effect of the two thrusts can easily push the door body slightly outward. Since the upper high-voltage switch and the pull rod are in rotational contact, it is easy to cause the upper high-voltage switch contact to disconnect, causing the machine to stop working; 3: In the process of repairing the steam-micro integrated machine and replacing the door body, when the door body is extracted from the bottom, since the lower high-voltage switch is at the bottom, the lower high-voltage switch will be mistakenly disconnected first, causing the machine fuse to burst. 4: The guide plate is fixed. Due to some dimensional errors and assembly errors, the door latch cannot be fully inserted into the guide plate, causing the upper power switch to fail to close. It may also damage the door latch, making the machine unable to start working. 5: The screw fixing column is a plastic structure. When replacing the interlocking assembly, the teeth may slip, causing the interlock to loosen and affect the normal operation of the machine.

[0004] In summary, the existing door interlocking mechanism needs to be further improved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a door interlocking mechanism capable of ensuring that the micro switch operates in a normal closing sequence in view of the above-mentioned existing technical status.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: the door interlock mechanism comprises a bracket, an upper high-voltage switch, a lower high-voltage switch and a low-voltage switch are installed on the bracket, the upper high-voltage switch has an upper high-voltage switch contact, the lower high-voltage switch has a lower high-voltage switch contact, and the low-voltage switch has a low-voltage switch contact, characterized in that an upper pull rod and a lower pull rod are installed on the bracket, the upper pull rod is arranged between the upper high-voltage switch and the lower high-voltage switch and can reciprocate horizontally, the upper high-voltage switch contact is arranged at the bottom of the front side of the upper high-voltage switch, the lower high-voltage switch contact is arranged at the top of the front side of the lower high-voltage switch, the top of the upper pull rod has an upper convex rib for triggering the upper high-voltage switch, the bottom of the upper pull rod has a lower convex rib for triggering the lower high-voltage switch, and the lower convex rib and the upper convex rib can respectively trigger the lower high-voltage switch and the upper high-voltage switch in turn, and the lower pull rod is used to trigger the low-voltage switch.

[0007] In order to smoothly trigger the switch contact, the rear side of the upper convex rib has an upper guide slope inclined downward from front to back, and the rear side of the lower convex rib has a lower guide slope inclined upward from front to back.

[0008] In order to prevent the switch contacts from generating outward thrust on the pull rod and the door body, the top surface of the upper convex rib is a horizontal plane, and the bottom surface of the lower convex rib is a horizontal plane. When both the upper high-voltage switch and the lower high-voltage switch are triggered, the upper high-voltage switch contact is vertically abutted against the top surface of the upper convex rib, and the lower high-voltage switch contact is vertically abutted against the bottom surface of the lower convex rib.

[0009] In order to enable the upper pull rod to move smoothly, a guide block for guiding the movement of the upper pull rod is provided on the bracket.

[0010] In order to make the upper railing move more smoothly, the guide block includes an upper guide block and a lower guide block. The upper guide block cooperates with the upper edge of the upper pull rod, and the lower guide block cooperates with the lower edge of the upper pull rod.

[0011] In order to enable the upper rod to quickly reset after the door is opened, a horizontally distributed first mounting column is provided on the bracket, a second mounting column aligned front and rear with the first mounting column is provided on the upper rod, and a spring is provided inside the upper rod, the rear end of the spring is sleeved on the first mounting column, and the front end of the spring is sleeved on the second mounting column. After the door is opened, the upper rod moves forward and resets under the action of the spring.

[0012] Preferably, the low-current switch is arranged below the lower high-current switch, the low-current switch contact is arranged at the front of the low-current switch, the upper end of the lower pull rod is rotatably connected to the bracket, the lower end of the lower pull rod is opposite to the low-current switch contact, and the front part of the lower end of the lower pull rod has a top rod for resisting against the door body.

[0013] In order to ensure that the door latch is inserted into the closed position, avoid interference, ensure the normal operation of the machine, and prevent customers from starting the steam or microwave function with the door open, thereby protecting customers' safety in using the product, preferably, a guide plate that can move left and right is installed on the front part of the bracket, and a guide hole that cooperates with the door latch is opened on the guide plate.

[0014] In order to strengthen the fixed connection between the interlocking mechanism and the machine body and prevent the interlocking mechanism and the machine body from loosening, a nut fixing column is provided on the bracket, and a nut is pre-embedded in the nut fixing column. The nut can preferably be a copper nut.

[0015] In order to enable the upper and lower rods to move smoothly, an upper notch or upper insertion hole for the upper rod to pass through is provided at the upper front side of the bracket, and a lower notch or lower insertion hole for the lower rod to pass through is provided at the lower front side of the bracket.

[0016] Compared with the prior art, the advantages of the present invention are that the door interlocking mechanism reasonably sets the positional relationship between the upper high-voltage switch contacts, the lower high-voltage switch contacts and the upper convex ribs and the lower convex ribs of the upper pull rod, so that the action sequence of the upper high-voltage switch and the lower high-voltage switch can be controlled in sequence through the reciprocating movement of the pull rod, thereby ensuring that the action is performed in a normal closing sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the installation structure of an embodiment of the present invention;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0020] Figure 4 A schematic structural diagram of a guide plate according to an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the existing interlocking mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings.

[0023] like Figures 1 to 4As shown, the door interlock mechanism in this embodiment can be applied to a steamer microwave oven, which includes a bracket 1, on which an upper high-voltage switch 2, a lower high-voltage switch 3 and a low-voltage switch 4 are installed, wherein the upper high-voltage switch 2 has an upper high-voltage switch contact 21, the lower high-voltage switch 3 has a lower high-voltage switch contact 31, and the low-voltage switch 4 has a low-voltage switch contact 41.

[0024] by Figure 2 The direction indicated by the middle arrow B is forward (outward), and an upper pull rod 5 and a lower pull rod 6 are installed on the bracket 1. The upper pull rod 5 and the lower pull rod 6 can move relative to the bracket 1. An upper notch 14 for the upper pull rod 5 to pass through is provided at the upper front side of the bracket 1, and a lower notch 15 for the lower pull rod 6 to pass through is provided at the lower front side of the bracket 1.

[0025] The upper pull rod 5 is arranged between the upper high-power switch 2 and the lower high-power switch 3 and can reciprocate horizontally forward and backward. The upper high-power switch contact 21 is arranged at the bottom of the front side of the upper high-power switch 2, and the lower high-power switch contact 31 is arranged at the top of the front side of the lower high-power switch 3. The top of the upper pull rod 5 has an upper convex rib 51 for triggering the upper high-power switch 2, and the bottom of the upper pull rod 5 has a lower convex rib 52 for triggering the lower high-power switch 3. The rear side of the upper convex rib 51 has an upper guide inclined surface 511 that is inclined downward from front to back, and the rear side of the lower convex rib 52 has a lower guide inclined surface 521 that is inclined upward from front to back. The above-mentioned convex rib structure is arranged on the upper pull rod 5, which can reduce the contact area between the upper pull rod 5 and the bracket 1, thereby reducing the friction force, which is conducive to the upper pull rod 5 to control the activity of the high-power switch more sensitively.

[0026] In this embodiment, the top surface of the upper convex rib 51 is a horizontal surface, and the bottom surface of the lower convex rib 52 is a horizontal surface. When the upper high-voltage switch 2 and the lower high-voltage switch 3 are both triggered, the upper high-voltage switch contact 21 is vertically abutted against the top surface of the upper convex rib 51, and the lower high-voltage switch contact 31 is vertically abutted against the bottom surface of the lower convex rib 52. Thus, the upper high-voltage switch contact 21 and the lower high-voltage switch contact 31 exert a vertical force on the upper pull rod 5, so that only the upper pull rod 5 itself produces an outward thrust on the door body 16, reducing the thrust on the door body 16, and also avoiding the phenomenon that the upper high-voltage switch contact 21 is easily disconnected, ensuring that the machine can work normally.

[0027] In order to guide the movement of the upper pull rod 5, a guide block is provided on the bracket 1. Specifically, the guide block includes an upper guide block 71 and a lower guide block 72. The upper guide block 71 cooperates with the upper edge of the upper pull rod 5, and the lower guide block 72 cooperates with the lower edge of the upper pull rod 5.

[0028] When the door body 16 is closed, the door body latch 17 acts on the upper pull rod 5 to move the upper pull rod 5 backward (inward). During the backward movement of the upper pull rod 5, the lower convex rib 52 first triggers the lower high-voltage switch 3, and then the upper convex rib 51 triggers the upper high-voltage switch 2.

[0029] When the door body 16 is opened, the upper rod 5 needs to be reset, that is, it needs to move forward (outward). In this embodiment, the upper rod 5 is quickly reset by the spring 8, and the reset structure is as follows: a horizontally distributed first mounting column 11 is provided on the bracket 1, and a second mounting column 53 aligned with the first mounting column is provided on the upper rod 5. The spring 8 is arranged inside the upper rod 5, and the rear end (inner end) of the spring 8 is sleeved on the first mounting column 11, and the front end (outer end) of the spring 8 is sleeved on the second mounting column 53. During the backward movement of the upper rod 5, the spring 8 is compressed and generates a force for the upper rod 5 to move forward. After the door body 16 is opened, the upper rod 5 moves forward under the action of the spring 8 and resets.

[0030] The weak current switch 4 is arranged below the lower strong current switch 3, and the weak current switch contact 41 is arranged at the front of the weak current switch 4. The lower pull rod 6 is used to trigger the weak current switch 4, and the upper end of the lower pull rod 6 is rotatably connected to the bracket 1, and the lower end of the lower pull rod 6 is opposite to the weak current switch contact 41. The front part of the lower end of the lower pull rod 6 has a top rod 61 for abutting against the door body 16. When the door body 16 is closed, the door body 16 presses the top rod 61, so that the lower end of the lower pull rod 6 presses the weak current switch contact 41, and the weak current switch 4 is triggered. When the door body 16 is opened, the lower pull rod 6 is reset under the action of the weak current switch contact 41.

[0031] Considering the possible size error and assembly error, the interlocking mechanism of this embodiment is provided with a guide plate 9 which can move left and right at the front of the bracket 1, and a guide hole 91 which matches with the door latch is provided on the guide plate 9. In this way, when the door latch 17 is inserted, the guide plate 9 can move left and right with the door latch 17, so that the door latch 17 is inserted into the closed position, avoiding interference, ensuring the normal operation of the machine, and preventing customers from starting the steam or microwave function when the door is open, thereby protecting the safety of customers in using the product.

[0032] In addition, a nut fixing column 12 is provided on the bracket 1, and a nut 13 is pre-embedded in the nut fixing column 12. The nut 13 can be a copper nut to avoid slipping when replacing the interlocking component, so as to strengthen the fixed connection between the interlocking mechanism and the machine body and prevent the interlocking mechanism and the machine body from loosening.

[0033] The working process of the door interlock mechanism is as follows:

[0034] When the door is open, the force of the spring 8 resets the upper pull rod 5, and at the same time, the lower pull rod 6 is also reset. At this time, the upper strong current switch contact 21, the lower strong current switch contact 31 and the weak current switch contact 41 are all in the disconnected state; when the user closes the door and prepares to start cooking, the door body latch 17 passes through the guide plate 9 and pushes the upper pull rod 5 backward (inward), and the lower convex rib 52 of the upper pull rod 5 presses the lower strong current switch contact 31 to close it, and the lower strong current switch 3 is triggered. Then, as the insertion depth of the door body latch 17 deepens, , the upper rib 51 on the upper pull rod 5 presses the upper strong current switch contact 21 to close it, the upper strong current switch 2 is triggered, and the lower pull rod 6 also moves backward under the action of the door body 16, and the weak current switch is also triggered under the action of the lower pull rod 6; on the contrary, when cooking is finished and the door is opened, the force of the door body 16 on the upper pull rod 5 and the lower pull rod 6 disappears, and the upper pull rod 5 moves forward (outward) under the action of the spring 8. The upper strong current switch 2 is disconnected first, and the lower strong current switch 3 is disconnected later, and the weak current switch 4 is also disconnected. In this way, the normal closing order of the upper strong current switch 2 and the lower strong current switch 3 can be ensured. When the door body 16 is replaced, the lower strong current switch 3 will not be disconnected first, ensuring smooth maintenance and replacement.

Claims

1. A door interlock mechanism, comprising a bracket (1), on which an upper high-voltage switch (2), a lower high-voltage switch (3) and a low-voltage switch (4) are mounted, wherein the upper high-voltage switch (2) has an upper high-voltage switch contact (21), the lower high-voltage switch (3) has a lower high-voltage switch contact (31), and the low-voltage switch (4) has a low-voltage switch contact (41), characterized in that: An upper pull rod (5) and a lower pull rod (6) are installed on the bracket (1); the upper pull rod (5) is arranged between the upper high-voltage switch (2) and the lower high-voltage switch (3) and can reciprocate horizontally; the upper high-voltage switch contact (21) is arranged at the bottom of the front side of the upper high-voltage switch (2); the lower high-voltage switch contact (31) is arranged at the top of the front side of the lower high-voltage switch (3); the top of the upper pull rod (5) has an upper convex rib (51) for triggering the upper high-voltage switch (2); the bottom of the upper pull rod (5) has a lower convex rib (52) for triggering the lower high-voltage switch (3); and the lower convex rib (52) and the upper convex rib (51) can respectively and sequentially trigger the lower high-voltage switch (3) and the upper high-voltage switch (2); the lower pull rod (6) is used to trigger the weak-voltage switch (4); When the door is closed and cooking is about to start, the upper pull rod (5) is pushed backwards, and the lower convex rib (52) of the upper pull rod (5) presses the lower strong current switch contact (31) to close it, and the lower strong current switch (3) is triggered. Then, the upper convex rib (51) on the upper pull rod (5) presses the upper strong current switch contact (21) to close it, and the upper strong current switch (2) is triggered. In addition, the lower pull rod (6) also moves backwards, and the weak current switch (4) is also triggered under the action of the lower pull rod (6). Conversely, when cooking is finished and the door is opened, the upper strong current switch (2) is disconnected first, and the lower strong current switch (3) is disconnected later, and the weak current switch (4) is also disconnected.

2. The door interlocking mechanism according to claim 1, characterized in that: The rear side of the upper convex rib (51) has an upper guide slope (511) that slopes downward obliquely from front to back, and the rear side of the lower convex rib (52) has a lower guide slope (521) that slopes upward obliquely from front to back.

3. The door interlocking mechanism according to claim 2, characterized in that: The top surface of the upper convex rib (51) is a horizontal surface, and the bottom surface of the lower convex rib (52) is a horizontal surface. When the upper high-voltage switch (2) and the lower high-voltage switch (3) are both triggered, the upper high-voltage switch contact (21) is vertically abutted against the top surface of the upper convex rib (51), and the lower high-voltage switch contact (31) is vertically abutted against the bottom surface of the lower convex rib (52).

4. The door interlocking mechanism according to claim 1, characterized in that: A guide block for guiding the movement of the upper pull rod (5) is provided on the bracket (1).

5. The door interlocking mechanism according to claim 4, characterized in that: The guide block comprises an upper guide block (71) and a lower guide block (72); the upper guide block (71) cooperates with the upper edge of the upper pull rod (5) for guiding, and the lower guide block (72) cooperates with the lower edge of the upper pull rod (5) for guiding.

6. The door interlock mechanism according to claim 1, characterized in that: A first mounting column (11) is horizontally arranged on the bracket (1), a second mounting column (53) is aligned front-to-back with the first mounting column on the upper pull rod (5), a spring (8) is arranged inside the upper pull rod (5), a rear end of the spring (8) is sleeved on the first mounting column (11), and a front end of the spring (8) is sleeved on the second mounting column (53).

7. The door interlock mechanism according to claim 1, characterized in that: The low-current switch (4) is arranged below the lower high-current switch (3), and the low-current switch contact (41) is arranged at the front of the low-current switch (4). The upper end of the lower pull rod (6) is rotatably connected to the bracket (1), and the lower end of the lower pull rod (6) is opposite to the low-current switch contact (41). The front part of the lower end of the lower pull rod (6) has a top rod (61) for abutting against the door body (16).

8. The door interlock mechanism according to claim 1, characterized in that: A guide plate (9) capable of moving left and right is installed at the front of the bracket (1), and a guide hole (91) matching with a door body latch (17) is formed on the guide plate (9).

9. The door interlock mechanism according to claim 1, characterized in that: A nut fixing column (12) is provided on the bracket (1), and a nut (13) is pre-embedded in the nut fixing column (12).

10. The door interlocking mechanism according to any one of claims 1 to 9, characterized in that: An upper notch or an upper insertion hole for the upper pull rod (5) to pass through is provided at the upper front side of the bracket (1), and a lower notch or a lower insertion hole for the lower pull rod (6) to pass through is provided at the lower front side of the bracket (1).

Images