Protection tool for electric energy meter and terminal welding plate

Abstract

The invention relates to a protection tool for an electric energy meter and a terminal welding plate, and relates to the field of circuit board welding. The protection tool comprises a base and a protection cover capable of being opened and closed, the protection cover covers the two sides of a circuit board, a through welding groove is formed in the surface of the protection cover, and the welding groove corresponds to the position, where an electronic device needs to be welded, of the circuit board; the protective cover comprises an upper cover plate and a lower cover plate, the lower cover plate is rotatably connected to the upper cover plate, the circuit board is located between the upper cover plate and the lower cover plate, and corresponding grooves are formed in the surfaces of the upper cover plate and the lower cover plate; the protection tool is provided with the protection cover, the grooves corresponding to the two sides of the circuit board are formed in the surfaces of the two corresponding sides of the protection cover, the circuit board can be placed in the grooves, the welding grooves are formed in the surfaces of the protection cover and the positions, needing to be welded, of the circuit board, and the whole device can effectively prevent tin beads and tin slag from remaining on the circuit board; therefore, the cleaning process of tin beads and tin slag of the circuit board is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit board welding, and in particular relates to a protective tooling for an electric energy meter and a terminal welding plate. Background Art

[0002] The circuit board of an electric energy meter in the prior art includes a circuit board body, multiple components, and multiple copper busbars. The multiple components are soldered on the circuit board body, and the multiple copper busbars are electrically connected to the circuit board through wires. Using a soldering iron to solder the components to the circuit board is a conventional operation method. This manual operation method usually requires certain technical skills and may be complicated for operators who are just starting to work in this area. During the production soldering process, tin beads and tin slag may remain on the circuit board, thereby affecting product quality. Cleaning the remaining tin beads and tin slag will also affect production efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a protective tool with a simple structure and reasonable design in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions: A first aspect of the present invention provides a protective tool for an electric energy meter and a terminal welding plate, comprising a base and a retractable protective cover, the protective cover covering both sides of a circuit board, the surface of the protective cover being provided with a through soldering groove, the soldering groove corresponding to a position on the circuit board where electronic components need to be soldered; The protective cover includes an upper cover plate and a lower cover plate, the lower cover plate is rotatably connected to the upper cover plate, the circuit board is located between the upper cover plate and the lower cover plate, the surfaces of the upper cover plate and the lower cover plate are provided with corresponding grooves, the two groups of grooves are combined to form a placement groove, the circuit board is placed in the placement groove, and the welding groove is provided on the surface of the groove of the upper cover plate.

[0005] As a further optimization scheme of the present invention, the base includes a horizontal support part and two groups of partition parts, the two groups of partition parts are fixedly connected to the edges on both sides of the upper surface of the horizontal support part, the surface of the partition part is rotatably connected to the support part, and the corresponding two side surfaces of the partition part are connected to fixed blocks at positions away from the support part, the lower cover plate is overlapped on the support part, and the upper cover plate is overlapped on the fixed block.

[0006] As a further optimization solution of the present invention, a protective film is provided on the surface of the lower cover plate away from the upper cover plate.

[0007] As a further optimization scheme of the present invention, a limiting mechanism is provided on the base for limiting the position of the protective cover, and the limiting mechanism includes two groups of limiting parts, and the two groups of side edges corresponding to the upper cover plate are each provided with a slot one, and the surfaces of the two groups of the blocking parts are provided with a through hole corresponding to the slot one, and the two groups of limiting parts are respectively slidably connected in the two groups of through holes, and one end of the limiting part is inserted into the slot one, and the surfaces of the two groups of limiting parts are connected with a linkage component.

[0008] As a further optimization scheme of the present invention, the linkage assembly includes a transmission gear, a mounting groove is provided on the surface of the horizontal support part, the transmission gear is rotatably connected to the inner wall of the mounting groove, the surfaces of the two groups of limiting parts are connected with connecting strips, and the connecting strips extend into the mounting groove. The surfaces of the two groups of connecting strips located in the mounting groove are fixedly connected with rack 1, and the two groups of rack 1 are arranged in a centrally symmetrical manner and are both engaged with the transmission gear.

[0009] As a further optimization scheme of the present invention, a stop block is raised on the lower surface of the horizontal support part, and a trigger member is slidably connected to the lower surface of the horizontal support part. The trigger member is fixedly connected to the limiting member, and a magnet 2 is embedded on the surface of the trigger member close to the stop block, and an iron sheet is connected to the surface of the stop member close to the trigger member.

[0010] As a further optimization scheme of the present invention, the surface of the lower cover plate is provided with a film pressing mechanism for fixing the protective film, and the film pressing mechanism includes a pressing frame and a clamping block. The clamping block is fixedly connected to the surface of the pressing frame at four groups of corners, and the corners of the surface of the lower cover plate corresponding to the clamping blocks are provided with through grooves, and the surface of the upper cover plate close to the lower cover plate is provided with clamping grooves at positions corresponding to the through grooves. The clamping block is inserted from the through groove and extends into the clamping groove. A fixing component is provided inside each group of clamping grooves, and the fixing component fixes the clamping block in the clamping groove.

[0011] As a further optimization scheme of the present invention, the fixing component includes an insert block, the inner wall of the clamping groove is provided with a hole groove, the surface of the clamping block is provided with a slot 2, the insert block is slidably connected in the hole groove, when the clamping block is inserted into the clamping groove, the insert block is inserted into the slot 2, and a transmission component is provided in the hole groove for driving the insert block to move.

[0012] As a further optimization scheme of the present invention, the transmission assembly includes a limiting block and a rotating gear, the limiting block is fixedly connected to the surface of the plug block, the rotating gear is rotatably connected to the inner wall of the hole groove, a sliding groove is provided on the surface of the rotating gear, the limiting block extends into the sliding groove at one end away from the plug block, a pressing groove is provided on the side of the upper cover plate, the pressing groove is communicated with the hole groove, the inner wall of the pressing groove is slidably connected with a pressing piece, the pressing piece extends out of the pressing groove, and the surface of the pressing piece is fixedly connected to a connecting rod on one side of the pressing piece located in the pressing groove, a spring is sleeved on the outer side of the connecting rod, the two ends of the spring are respectively connected to the surface of the pressing piece and the inner wall of the pressing groove, the end of the connecting rod away from the pressing piece is connected to a transmission rod, and the surface of the transmission rod is connected to four rack twos, and each group of rack twos is respectively meshed with four groups of rotating gears.

[0013] A second aspect of the present invention provides an electric energy meter, comprising the circuit board described above, wherein the circuit board is provided with electronic components; It also includes a bottom shell, a terminal box and a cover shell, wherein the cover shell is mounted on the bottom shell, the terminal box is arranged at the inner bottom end of the bottom shell, the terminal box is electrically connected to the circuit board, and the circuit board is arranged between the bottom shell and the cover shell.

[0014] The beneficial effects of the present invention are as follows: the present invention is provided with a protective cover, and grooves corresponding to the two sides of the circuit board are provided on the corresponding two side surfaces of the protective cover, so that the circuit board can be placed in the grooves, and welding grooves are opened on the surface of the protective cover and the position where welding is required on the circuit board. The entire device can effectively prevent tin beads and tin slag from remaining on the circuit board, thereby reducing the cleaning process of tin beads and tin slag on the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 2 1 is a schematic diagram of the protective cover structure of the first embodiment of the present invention; Figure 3 This is a schematic diagram of the position of the limiting mechanism of the second embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the limiting member in the second embodiment of the present invention; Figure 5 This is a schematic diagram of the limiting mechanism structure of the second embodiment of the present invention; Figure 6 This is a schematic diagram of the linkage component structure of the second embodiment of the present invention; Figure 7 Schematic diagram of the structure of the film pressing mechanism of the third embodiment of the present invention; Figure 8 1 is a schematic diagram of the structure of the fixing assembly according to the third embodiment of the present invention; Figure 91 is a schematic diagram of the structure of the push-piece according to the third embodiment of the present invention; Figure 10 It is a schematic diagram of the rotating gear structure of embodiment 3 of the present invention.

[0016] In the figure: 1. Base; 101. Horizontal support; 102. Blocking portion; 2. Protective cover; 21. Upper cover; 22. Lower cover; 3. Welding groove; 4. Groove; 5. Support member; 6. Fixing block; 7. Limiting mechanism; 71. Limiting member; 72. Slot 1; 73. Through hole; 8. Linkage assembly; 81. Transmission gear; 82. Rack 1; 83. Connecting bar; 84. Mounting groove; 9. Stopper; 10. Trigger member; 1 1. Film pressing mechanism; 111. Pressing frame; 112. Snap-fit ​​block; 12. Through slot; 13. Snap-fit ​​slot; 14. Fixing assembly; 141. Insert block; 142. Hole slot; 143. Slot 2; 15. Transmission assembly; 151. Limiting block; 152. Rotating gear; 153. Sliding slot; 154. Pressing member; 155. Connecting rod; 156. Spring; 157. Transmission rod; 158. Rack 2; 16. Pressing slot. DETAILED DESCRIPTION

[0017] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1 refer to Figure 1 and Figure 2 The structure shown is a protective tool for an electric energy meter and a terminal welding plate, comprising a base 1 and an openable protective cover 2. The protective cover 2 covers both sides of the circuit board. The surface of the protective cover 2 is provided with a through soldering groove 3. The soldering groove 3 corresponds to the position on the circuit board where the electronic components need to be soldered. The protective cover 2 includes an upper cover plate 21 and a lower cover plate 22. The lower cover plate 22 is rotatably connected to the upper cover plate 21. The circuit board is located between the upper cover plate 21 and the lower cover plate 22. Corresponding grooves 4 are provided on the surfaces of the upper cover plate 21 and the lower cover plate 22. The two groups of grooves 4 are combined to form a placement groove. The circuit board is placed in the placement groove. The welding groove 3 is provided on the surface of the groove 4 of the upper cover plate 21.

[0019] It should be noted that the upper cover 21 and the lower cover 22 can be connected by a hinge or a rotating shaft. When the upper cover 21 and the lower cover 22 are put together, the opening and closing of the protective cover 2 can be controlled by magnetic attraction. Specifically, an iron block can be embedded in the surface of the upper cover 21 close to the lower cover 22, and a magnet 1 can be embedded in the position corresponding to the iron block on the surface of the lower cover 22. The opening and closing of the upper cover 21 and the lower cover 22 can be controlled by the cooperation of the magnet 1 and the iron block.

[0020] It should be further explained that the present invention places the circuit board in the placement groove of the protective cover 2. The protective cover 2 has corresponding welding grooves 3 reserved at the positions on the circuit board where electronic components need to be welded. The setting of the protective cover 2 can make the tin beads and tin slag generated during the production welding process remain on the protective cover 2 instead of remaining on the circuit board, thereby reducing the cleaning process of the tin beads and tin slag on the circuit board.

[0021] Furthermore, the base 1 includes a horizontal support portion 101 and two groups of partition portions 102. The lower surface of the horizontal support seat is fixedly connected to multiple groups of supporting feet. The two groups of partition portions 102 are fixedly connected to the edges on the corresponding sides of the upper surface of the horizontal support portion 101. The surface of the partition portion 102 is rotatably connected to the support member 5. The corresponding two side surfaces of the partition portion 102 are connected to the fixed blocks 6 away from the support member 5. The lower cover plate 22 is overlapped on the support member 5, and the upper cover plate 21 is overlapped on the fixed block 6.

[0022] Specifically, the support member 5 is connected to the surface of the barrier portion 102 via a rotating shaft. The barrier portion 102 is provided with an angle control mechanism. The angle control mechanism can be any existing structure capable of controlling the rotation of the support member 5, and can be manually controlled or mechanically rotated. In this embodiment, two angle control mechanism structures are provided. One is: an arc-shaped chute is provided on the surface of the barrier portion 102, a slider is fixedly connected to the surface of the support member 5, a bump is raised on the surface of the slider, and a plurality of notches are provided on the inner wall of the chute. The bumps and the notches cooperate to control the rotation angle of the support member 5, wherein the bumps are hemispherical. When the bumps move into the notches as the support member 5 rotates, the support member 5 can be fixed at the angle; Another is: a motor (a small-sized stepping motor, servo motor, etc.) is connected to the surface of the baffle 102, which is rotatably fixedly connected to the driving end of the motor, and the support member 5 is driven to rotate by the motor.

[0023] It should be noted that for components with longer pins (such as inductors, resistors, connectors, etc.), it is sometimes necessary to tilt the circuit board to ensure that the welding tool can accurately align with the longer pins and allow the solder on the pins to flow correctly to ensure reliable connection. Therefore, support member 5 is provided.

[0024] It should be further explained that the tilt angle of the protective cover 2 can be adjusted by providing a rotatable support member 5, thereby facilitating use. When the support member 5 is rotated to a horizontal state, its upper surface is on the same horizontal plane as the upper surface of the fixing block 6.

[0025] Furthermore, a protective film is provided on a surface of the lower cover plate 22 away from the upper cover plate 21 .

[0026] In this embodiment, the protective film can be a toughened film, a hydrogel film, a plastic film, etc. (similar to a mobile phone film) with adhesive, and the protective film can be first attached to the protective cover 2, and then the circuit board is placed in the placement groove.

[0027] In actual use, after welding is completed, the protective film can be directly torn off from the upper cover plate 21 to complete the cleaning of the protective cover 2. When it is used again, a new clean protective film can be applied, which is very convenient to operate.

[0028] It should be noted that different protective covers 2 can be used for different circuit boards, but different protective covers 2 only have different positions of the groove 4 and the welding groove 3 (which need to be adapted to the circuit board), and the overall size is the same and can all be placed on the base 1.

[0029] Example 2 This embodiment is a further improvement on the first embodiment, in which a limiting mechanism 7 is added to limit the position of the protective cover 2 to prevent the protective cover 2 from moving during the welding process. Figures 3 to 6 In the structure shown, the limiting mechanism 7 includes two groups of limiting members 71, and the two groups of side edges corresponding to the upper cover 21 are each provided with a slot 1 72. The surfaces of the two groups of barrier portions 102 are provided with through holes 73 corresponding to the slot 1 72. The two groups of limiting members 71 are respectively slidably connected in the two groups of through holes 73, and one end of the limiting member 71 is inserted into the slot 1 72. The surfaces of the two groups of limiting members 71 are connected with a linkage assembly 8.

[0030] Specifically, the limiting member 71 includes an inserting portion and a connecting portion. The connecting portion is attached to the surface of the base 1 , and the inserting portion is cylindrical and inserted into the slot 1 72 and the through hole 73 .

[0031] It should be noted that the upper cover plate 21 can rotate with the plug-in portion being a circle.

[0032] Furthermore, the linkage assembly 8 includes a transmission gear 81, a mounting groove 84 is provided on the surface of the horizontal support portion 101, the transmission gear 81 is rotatably connected to the inner wall of the mounting groove 84, the surfaces of the two sets of limiting members 71 are connected with connecting bars 83, the connecting bars 83 extend into the mounting groove 84, and the surfaces of the two sets of connecting bars 83 located in the mounting groove 84 are fixedly connected with racks 82, and the two sets of racks 82 are centrally symmetrically arranged and are both engaged with the transmission gear 81.

[0033] Furthermore, a stop block 9 is protruded from the lower surface of the horizontal support part 101, and a trigger member 10 is slidably connected to the lower surface of the horizontal support part 101. The trigger member 10 is fixedly connected to the limiting member 71, and a magnet 2 is embedded on the side surface of the trigger member 10 close to the stop block 9, and an iron sheet is connected to the side surface of the stop block 9 close to the trigger member 10.

[0034] Specifically, the trigger member 10 and the connecting strip 83 are both connected to the surface of the connecting portion; it should be noted that the sliding of the trigger member 10 can be restricted by the matching arrangement of the second magnet and the iron sheet.

[0035] In actual use, the sliding trigger member 10 drives the connecting bar 83 and the rack 1 82 to move, thereby driving the transmission gear 81 to rotate, thereby driving the movement of another set of rack 1 82 and the connecting bar 83, so that the two sets of limiting members 71 can be inserted into or removed from the corresponding slot 1 72 at the same time.

[0036] Example 3 This embodiment adds a film pressing mechanism 11 on the basis of the first embodiment, for pressing the protective film provided on the surface of the lower cover plate 22. In this embodiment, the protective film does not need to be sticky and can also be covered on the surface of the lower cover plate 22. For details, refer to Figures 7 to 10 As shown in the partial structure, the film pressing mechanism 11 includes a pressing frame 111 and a clamping block 112. The clamping block 112 is fixedly connected to the surface of the pressing frame 111 at four groups of corners. The corners of the surface of the lower cover plate 22 corresponding to the clamping blocks 112 are provided with through grooves 12. The surface of the upper cover plate 21 close to the lower cover plate 22 side is provided with clamping grooves 13 corresponding to the through grooves 12. The clamping block 112 is inserted from the through grooves 12 and extends into the clamping grooves 13. A fixing component 14 is provided inside each group of clamping grooves 13. The fixing component 14 fixes the clamping block 112 in the clamping groove 13.

[0037] It should be noted that Figure 7 The position of the middle dotted line is the position where the protective film is placed. In this embodiment, there is no need to use magnetic attraction to control the opening and closing of the protective cover 2. The film pressing mechanism 11 can make the upper cover plate 21 and the lower cover plate 22 come together.

[0038] It should be further explained that a rubber pad may be connected to the contact portion between the pressing frame 111 and the protective film.

[0039] Furthermore, the fixing component 14 includes an insert block 141, a hole groove 142 is provided on the inner wall of the clamping groove 13, and a second slot 143 is provided on the surface of the clamping block 112. The insert block 141 is slidably connected in the hole groove 142. When the clamping block 112 is inserted into the clamping groove 13, the insert block 141 is inserted into the second slot 143. A transmission component 15 is provided in the hole groove 142 for driving the insert block 141 to move.

[0040] In this embodiment, the circuit board needs to be placed in the placement groove before the protective film is placed.

[0041] Furthermore, the transmission assembly 15 includes a limiting block 151 and a rotating gear 152. The limiting block 151 is fixedly connected to the surface of the insert block 141, and the rotating gear 152 is rotatably connected to the inner wall of the hole groove 142. A sliding groove 153 is provided on the surface of the rotating gear 152. The end of the limiting block 151 away from the insert block 141 extends into the sliding groove 153. A pressing groove 16 is provided on the side of the upper cover 21. The pressing groove 16 is connected to the hole groove 142. A pressing member 154 is slidably connected to the inner wall of the pressing groove 16. The movable member 154 extends outside the push groove 16. A connecting rod 155 is fixedly connected to the surface of one side of the push groove 16. A spring 156 is sleeved on the outer side of the connecting rod 155. The two ends of the spring 156 are respectively connected to the surface of the push member 154 and the inner wall of the push groove 16. The end of the connecting rod 155 away from the push member 154 is connected to a transmission rod 157. Four racks 158 are connected to the surface of the transmission rod 157. Each group of racks 158 is engaged with four groups of rotating gears 152.

[0042] It should be noted that the side of the multiple groups of snap-fit ​​blocks 112 that contacts the protective film is formed into an inclined surface. This setting can limit the protective film (i.e., determine the position of the protective film); under the action of the spring 156, one end of the insert block 141 is always located in the snap-fit ​​groove 13.

[0043] In actual use, the protective film is placed on the surface of the lower cover plate 22, and then the pressing frame 111 is covered on the edge of the protective film, so that the clamping block 112 is inserted into the clamping groove 13. When the clamping block 112 is inserted into the clamping groove 13, the clamping block 112 will contact the inserting block 141. The contact surface of the inserting block 141 and the clamping block 112 is an inclined surface, so the clamping block 112 will push the inserting block 141 into the hole groove 142. When the clamping block 112 is fully inserted into the clamping groove 13, under the action of the spring 156, the inserting block 141 will be inserted into the second slot 143, thereby limiting the movement of the clamping block 112. When the protective film needs to be removed or the protective cover 2 needs to be opened, the pressing member 154 can be triggered. The pressing member 154 drives the four sets of racks 158 to move, thereby driving the rotating gear 152 to rotate at the same time. The cooperation between the limiting block 151 and the sliding groove 153 causes the inserting block 141 to move into the hole groove 142. At this time, the pressing frame 111 can be removed from the surface of the lower cover plate 22.

[0044] Example 4 An electric energy meter, comprising the circuit board of embodiment 1, wherein the circuit board is provided with electronic components; The electric energy meter also includes a bottom shell, a terminal box and a cover shell. The cover shell is installed on the bottom shell. The terminal box is arranged at the inner bottom end of the bottom shell. The terminal box is electrically connected to the circuit board. The circuit board is arranged between the bottom shell and the cover shell.

[0045] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A protective tool for a terminal welding plate, characterized in that: The invention comprises a base (1) and an openable protective cover (2), wherein the protective cover (2) covers both sides of a circuit board, and a through soldering groove (3) is provided on the surface of the protective cover (2), wherein the soldering groove (3) corresponds to a position on the circuit board where electronic components need to be soldered; The protective cover (2) comprises an upper cover plate (21) and a lower cover plate (22), wherein the lower cover plate (22) is rotatably connected to the upper cover plate (21), and the circuit board is located between the upper cover plate (21) and the lower cover plate (22). The surfaces of the upper cover plate (21) and the lower cover plate (22) are both provided with corresponding grooves (4), and the two groups of grooves (4) are combined to form a placement groove, and the circuit board is placed in the placement groove, and the welding groove (3) is provided on the surface of the groove (4) of the upper cover plate (21).

2. The protective tooling for terminal welding plate according to claim 1, characterized in that: The base (1) comprises a horizontal support portion (101) and two groups of baffle portions (102), wherein the two groups of baffle portions (102) are fixedly connected to the edges of the upper surface of the horizontal support portion (101) on both sides thereof, the surfaces of the baffle portions (102) are rotatably connected to the support member (5), and the positions of the corresponding two side surfaces of the baffle portions (102) away from the support member (5) are connected to the fixing blocks (6), the lower cover plate (22) is overlapped on the support member (5), and the upper cover plate (21) is overlapped on the fixing blocks (6).

3. The protective tooling for terminal welding plate according to claim 1, characterized in that: A protective film is provided on the surface of the lower cover plate (22) on one side away from the upper cover plate (21).

4. The protective tooling for a terminal welding plate according to claim 2, characterized in that: The base (1) is provided with a limiting mechanism (7) for limiting the position of the protective cover (2), the limiting mechanism (7) comprising two groups of limiting members (71), two groups of side edges corresponding to the upper cover (21) are provided with slots (72), the surfaces of the two groups of the blocking portions (102) are provided with through holes (73) corresponding to the slots (72), the two groups of limiting members (71) are respectively slidably connected in the two groups of through holes (73), one end of the limiting member (71) is inserted into the slots (72), and the surfaces of the two groups of limiting members (71) are connected with linkage components (8).

5. The protective tool for the terminal welding plate according to claim 4, characterized in that: The linkage assembly (8) includes a transmission gear (81), a mounting groove (84) is provided on the surface of the horizontal support portion (101), and the transmission gear (81) is rotatably connected to the inner wall of the mounting groove (84). The surfaces of the two groups of limiting members (71) are connected to connecting bars (83), and the connecting bars (83) extend into the mounting groove (84). The surfaces of the two groups of connecting bars (83) located in the mounting groove (84) are fixedly connected to racks 1 (82), and the two groups of racks 1 (82) are centrally symmetrically arranged and both mesh with the transmission gear (81).

6. The protective tool for the terminal welding plate according to claim 5, characterized in that: A stopper (9) is protruded from the lower surface of the horizontal support portion (101), a trigger member (10) is slidably connected to the lower surface of the horizontal support portion (101), the trigger member (10) is fixedly connected to the limiting member (71), a second magnet is embedded on the side surface of the trigger member (10) close to the stopper (9), and an iron sheet is connected to the side surface of the stopper (9) close to the trigger member (10).

7. The protective tool for the terminal welding plate according to claim 2, characterized in that: The surface of the lower cover plate (22) is provided with a film pressing mechanism (11) for fixing the protective film, the film pressing mechanism (11) includes a pressing frame (111) and a clamping block (112), the clamping block (112) is fixedly connected to the surface of the pressing frame (111) at four groups of corners, the corners of the surface of the lower cover plate (22) corresponding to the clamping block (112) are provided with through grooves (12), the surface of the upper cover plate (21) close to the lower cover plate (22) is provided with clamping grooves (13) at positions corresponding to the through grooves (12), the clamping block (112) is inserted from the through grooves (12) and extends into the clamping grooves (13), each group of clamping grooves (13) is provided with a fixing component (14), and the fixing component (14) fixes the clamping block (112) in the clamping groove (13).

8. The protective tool for the terminal welding plate according to claim 7, characterized in that: The fixing assembly (14) includes an insert block (141), an inner wall of the clamping groove (13) is provided with a hole groove (142), a surface of the clamping block (112) is provided with a second slot (143), the insert block (141) is slidably connected in the hole groove (142), and when the clamping block (112) is inserted into the clamping groove (13), the insert block (141) is inserted into the second slot (143), and a transmission assembly (15) is provided in the hole groove (142) for driving the insert block (141) to move.

9. The protective tool for the terminal welding plate according to claim 8, characterized in that: The transmission assembly (15) includes a limiting block (151) and a rotating gear (152). The limiting block (151) is fixedly connected to the surface of the insert block (141). The rotating gear (152) is rotatably connected to the inner wall of the hole groove (142). A sliding groove (153) is provided on the surface of the rotating gear (152). One end of the limiting block (151) away from the insert block (141) extends into the sliding groove (153). A pressing groove (16) is provided on the side of the upper cover (21). The pressing groove (16) is connected to the hole groove (142). A pressing member (154) is slidably connected to the inner wall of the pressing groove (16). The push member (154) extends outside the push groove (16), and a connecting rod (155) is fixedly connected to a surface of one side of the push member (154) located in the push groove (16). A spring (156) is sleeved on the outer side of the connecting rod (155), and the two ends of the spring (156) are respectively connected to the surface of the push member (154) and the inner wall of the push groove (16). The end of the connecting rod (155) away from the push member (154) is connected to a transmission rod (157), and the surface of the transmission rod (157) is connected to four racks (158), and each group of racks (158) is respectively engaged with four groups of rotating gears (152).

10. An electric energy meter, characterized in that: The circuit board according to claim 1, wherein the circuit board is provided with electronic devices; It also includes a bottom shell, a terminal box and a cover shell, wherein the cover shell is mounted on the bottom shell, the terminal box is arranged at the inner bottom end of the bottom shell, the terminal box is electrically connected to the circuit board, and the circuit board is arranged between the bottom shell and the cover shell.

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