Temperature control device for frequency converter of electric bucket excavator

Abstract

Temperature control device for frequency converters of electric excavators, characterized in that comprising an AFE rectifier cabinet (100) comprising a cabinet body (101), a cabinet door (102) which is fixedly connected to the cabinet body (101) by hinges, a frequency converter 6SE70 (103) which is fixedly connected inside the cabinet body (101), an air outlet (104) which is provided on the top of the cabinet body (101), and an air inlet (105) which is arranged on the top of the cabinet body (101); wherein at least twelve air inlets (105) are provided;a temperature control device (200) comprising a heating component (201) fixedly connected within the cabinet body (101), a thermal sensor bimetallic sheet (202) fixedly connected within the cabinet body (101), a delay short-circuit switch (203) fixedly connected within the cabinet body (101), a connecting rod component (204) fixedly connected within the cabinet body (101), and a blocking plate (205) movably connected outside the cabinet body (101).

Description

TECHNICAL FIELDThe present invention relates to the technical field of temperature control for frequency converters, and more particularly to a temperature control device for frequency converters of electric shovels.PRIOR ARTThe electric shovel WK-20 / 35 was originally equipped with a temperature control probe in the rectifier cabinet AFE of frequency converter 6SE70 to protect the frequency converter during the over- or low-temperature operation. However, due to cold winter, when the blade is stopped for a long time or the temperature in the electric space is low after occurrence of a fault, the frequency converter may not start to protect the performance of the components in the cabinet from damage. Therefore, an external electric grill is required to heat the electric space for a period before the start, which wastes a lot of time and seriously deteriorates the production efficiency. Or, the device is forcibly started after the temperature control probe in the cabinet is manually disassembled and externally heated, which easily leads to damage to the component performance. This study aims to install a set of temperature control devices within an AFE rectifier cabinet to avoid situations where, due to longer downtime, the inverter cannot start at low temperatures or component performance is damaged, thereby improving production and maintenance efficiency.CONTENT OF THE PRESENT INVENTIONIn view of the problem that the above frequency converter 6SE 70 is unable to start in low-temperature environments, the present application is proposed. Therefore, the purpose of the present application is to provide a temperature control device for frequency converters of electric shovels.To solve the above technical problems, the present application provides the following technical solutions: including an AFE rectifying cabinet including a cabinet body, a cabinet door fixedly connected to the cabinet body by hinges, a frequency converter 6SE70 fixedly connected inside the cabinet body, an air outlet provided at the top of the cabinet body, and an air inlet provided at the top of the cabinet body; wherein at least twelve air inlets are provided; A temperature control device comprising a heating component fixedly connected within the cabinet body, a thermal sensing bimetallic sheet fixedly connected within the cabinet body, a delay short circuit switch fixedly connected within the cabinet body, a connecting rod component fixedly connected within the cabinet body, and a blocking plate movably connected outside the cabinet body; wherein the blocking plate is made of a light foam polyurethane material having a good heat retaining effect.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the heating component includes a mounting base fixedly connected within the cabinet body, a fan blade movably connected on the surface of the mounting base, and a heating pipe fixedly connected within the mounting base; wherein the mounting base is connected to a negative terminal of the power supply to connect the fan blade in series with the heating pipe.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the thermal sensing bimetallic sheet comprises a mounting seat fixedly connected within the cabinet body, a copper sheet laser welded to one end of the mounting seat, an iron sheet laser welded to one end of the mounting seat, and a contact head fixedly connected to the copper sheet and the iron sheet, wherein the contact head is made of insulating material.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, a thermal expansion coefficient of the copper sheet and the iron sheet when the temperature rises is higher, the thermal expansion coefficient of the copper sheet is higher than that of the iron sheet, so that the copper sheet shrinks more than the iron sheet, and therefore the thermal sensory bimetallic sheet will bend; and when the temperature falls, it will bend in the opposite direction. wherein when the temperature is below -10°, the thermal sensory bimetallic sheet bends and drives the contact head to contact a stopper and open the delay short-circuiting switch, so that the heating component functions; When the temperature exceeds 55°C, the thermal sensing bimetallic sheet flexes and drives the contact head to contact a lever and lift a guide rod so that the blocking plate rises, and when the blocking plate rises to a certain level, the lever contacts a contact point to cause the fan blade to function.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the deceleration short-circuiting switch includes a housing fixedly connected within the housing, a ratchet short-circuiting switch movably connected within the housing, and a differential gear set movably connected within the housing; wherein an outer surface of the housing is provided with first and second connectors, the first connector is connected to a positive pole of the power supply, and the second connector is connected to the mounting base via a wire and connects the fan blade in series to the heating pipe.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the ratchet short-circuiting switch includes a ratchet wheel movably connected inside the housing, a stopper fixedly connected on the back side of the ratchet wheel, a torsion spring fixedly connected to the ratchet wheel on the surface of the stopper, a protrusion fixedly connected on the surface of the ratchet wheel, an elastic switch fixedly connected inside the housing and movably cooperating with the outer surface of the protrusion, a first guide washer fixedly connected inside the housing, and a second guide washer fixedly connected inside the housing; wherein the first guide washer is connected to the first connector via the wire, and the second guide washer is connected to the second connector via the wire.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the differential gear set includes a first differential gear movably connected within the housing, a second differential gear movably connected within the housing and engaged with the first differential gear, a third differential gear movably connected within the housing and engaged with the second differential gear, a fourth differential gear movably connected within the housing and engaged with the third differential gear, and a fifth differential gear movably connected within the housing and engaged with the fourth differential gear.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the first differential includes a first large differential gear movably connected within the housing and a first small differential gear fixedly connected at one end of the first large differential gear; the second differential gear includes a second large differential gear movably connected within the housing and a second small differential gear fixedly connected at one end of the second large differential gear; the third differential gear includes a third large differential gear movably connected within the housing and a third small differential gear fixedly connected at one end of the third large differential gear; The fourth differential includes a fourth large differential movably connected within the housing and a fourth small differential fixedly connected at one end of the fourth large differential; the fifth differential includes a fifth large differential movably connected within the housing and a fifth small differential fixedly connected at one end of the fifth large differential.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the connecting rod component includes a support rod fixedly connected inside the cabinet body, a lever movably connected at one end of the support rod, and a contact point fixedly connected at one end of the cabinet body, wherein the support rod is connected with a positive pole wire, and the contact point is connected with the fan blade separately via the wire.As a preferred solution for the temperature control device for frequency converters of electric shovels according to the present application, the surface of the blocking plate is provided with a fixedly connected guide rod, and a sealing column movably connected to the same number of air inlets is provided; the guide rod passing through and movably connected to the cabinet body. The advantageous effects of the present application are as follows: Due to the different thermal expansion coefficient of the thermal sensing bimetallic sheet, when the temperature is too low, the heating component is caused to function by contacting the delay short-circuiting switch. Under the drive of the delay short-circuit switch, the thermal sensing bimetallic sheet is not reset due to the short-term temperature rise before the frequency converter 6SE70 is fully heated, thereby improving the working efficiency. If the temperature is too high, the thermal sensing bi-metallic sheet causes the blocking plate to be raised by the connecting rod component, at the same time the fan blade opens separately to dissipate heat.BRIEF DESCRIPTION OF THE DRAWINGSIn order to more clearly illustrate the technical solution of the embodiments of the present application, a brief introduction will be given to the accompanying drawings, which are required for the description of the embodiments. It is obvious that the accompanying drawings described below are only some embodiments of the present application. Other drawings can be obtained on this basis for those skilled in the art without any need for any fatigue. Below: FIG. 1 is an internal schematic diagram of a temperature control device for frequency converters of electric shovels according to the present application. FIG. 2 is an enlarged partial view of a temperature control device for frequency converters of electric shovels according to the present application. FIG. 3 is a schematic diagram of a temperature control device for frequency converters of electric shovels according to the present application from another perspective. FIG. 4 is a side sectional view of a temperature control device for frequency converters of electric shovels according to the present application. FIG. 5 is an enlarged partial view of a temperature control device of the present application. FIG. 6 is a working path diagram of a temperature control device of the present application. FIG. 7 is a schematic diagram of a temperature control device for frequency converters of electric shovels according to the present application from another perspective. FIG. 8 is a structural diagram of a differential gear set of the present application. FIG. 9 is a schematic diagram of a differential gear set of the present application from another perspective. FIG. 10 is an operating principle diagram of a differential gear set of the present application. FIG. 11 is an operating principle diagram of a differential gear set of the present application.DETAILED DESCRIPTIONIn order to make the above objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below in conjunction with the accompanying drawings of the specification.In the following description, many specific details are set forth in order to facilitate a complete understanding of the present application. However, the present invention may be implemented in other ways than those described herein. Those skilled in the art can make similar generalizations without sacrificing the connotation of the present application. Therefore, the present invention is not limited by the specific embodiments disclosed below.Second, the term "an embodiment" or "embodiments" referred to herein refers to specific features, structures, or characteristics that may be included in at least one embodiment of the present application. The phrase "in one embodiment" appearing at various places throughout this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that excludes one from the other embodiments.Further, the present application will be described in detail in conjunction with the schematic diagram. In describing the embodiments of the present application, for convenience of explanation, the sectional view illustrating the device structure is not enlarged to the usual scale, and the schematic diagram is only an example that should not limit the scope of the present application here. Moreover, in actual production, three-dimensional spatial dimensions of length, width and depth should be taken into account.First EmbodimentReferring to FIGS. 1-8, it is a first embodiment of the present application. It provides a temperature control device for frequency converters of electric shovels. The device comprises an AFE rectifying cabinet 100 comprising a cabinet body 101, a cabinet door 102 fixedly connected to the cabinet body 101 by hinges, a 6SE70 frequency converter 103 fixedly connected within the cabinet body 101, an air outlet 104 provided at the top of the cabinet body 101, and an air inlet 105 arranged at the top of the cabinet body 101; wherein at least twelve air inlets 105 are provided; a temperature control device 200 comprising a heating component 201 fixedly connected inside the cabinet body 101, a thermal sensing bimetallic sheet 202 fixedly connected inside the cabinet body 101, a delay short circuit switch 203 fixedly connected inside the cabinet body 101, a connecting rod component 204 fixedly connected inside the cabinet body 101, and a blocking plate 205 movably connected outside the cabinet body 101; wherein the blocking plate 205 is made of a light foam polyurethane material having good heat retaining effect.Specifically, the heating component 201 includes a mounting base 201 athat is fixedly connected inside the cabinet body 101, a fan blade 201 bthat is movably connected on the surface of the mounting base 201 a, and a heating pipe 201 cthat is fixedly connected inside the mounting base 201 a; wherein the mounting base 201 ais connected to a negative terminal of the power supply to connect the fan blade 201 bto the heating pipe 201 cin series.Further, the thermal sensing bimetallic sheet 202 comprises a mounting seat 202a fixedly connected within the cabinet body 101, a copper sheet 202b laser welded to an end of the mounting seat 202a, an iron sheet 202c laser welded to an end of the mounting seat 202a, and a contact head 202d fixedly connected to the copper sheet 202b and the iron sheet 202c, wherein the contact head 202d is made of insulating material.More specifically, the connecting rod component 204 includes a support rod 204 afixed inside the cabinet body 101, a lever 204 bmovedly connected at one end of the support rod 204 a, and a contact point 204 cfixedly connected at one end of the cabinet body 101, wherein the support rod 204 ais connected with a positive pole wire, and the contact point 204 cis connected to the fan blade 201 bseparately via the wire.Further, the surface of the blocking plate 205 is provided with a fixedly connected guide rod 205 a, and a seal column 205 bmovedly connected to the same number of air inlets 105 is provided; the guide rod 205 apass through and movably connected to the cabinet body 101.In summary, during use, when the WK-20 / 35 electric shovel functions and the temperature inside the AFE rectifier cabinet rises, the thermal sensing bimetallic sheet 202 will flex so that the contact head 202d contacts the lever 204b and the blocking plate 205 will be lifted under the action of the support rod 204a. At the same time, the contact point 204c is touched and the fan blade 201b opens separately as the hot air in the AFE rectifier cabinet is discharged.Second EmbodimentReferring to FIGS. 1-11, the second embodiment of the present application differs from the previous embodiment in that it provides a ratchet short-circuiting switch 203b.Specifically, an outer surface of the housing 203 ais provided with a first 203 a- 1 and a second connector 203 a- 2, the first connector 203 a- 1 is connected to a positive terminal of the power supply, and the second connector 203 a- 2 is connected to the mounting base 201 avia a wire and connects the fan blade 201 bin series to the heating tube 201 c.Further, the ratchet short-circuiting switch 203 bincludes a ratchet wheel 203 b- 1 movably connected inside the housing 203 a, a stopper 203 b- 2 fixedly connected on the rear side of the ratchet wheel 203 b- 1, a torsion spring 203 b- 3 fixedly connected to the ratchet wheel 203 b- 1 on the surface of the stopper 203 b- 2, a protrusion 203 b- 4 fixedly connected on the surface of the ratchet wheel 203 b- 1, an elastic switch 203 b- 5 fixedly connected inside the housing 203 aand movably cooperating with the outer surface of the protrusion 203 b- 4, a first guide plate 203 b- 6 fixedly connected inside the housing 203 a, and a second guide plate 203 b- 7 fixedly connected inside the housing 203 a; wherein the first guide washer 203 b- 6 is connected to the first connector 203 a- 1 via the wire, and the second guide washer 203 b- 7 is connected to the second connector 203 a- 2 via the wire.When the WK-20 / 35 electric shovel is stopped during operation, the power switch is turned on. When the temperature in the AFE rectifying cabinet is too low, the thermal sensing bimetallic sheet 202 bends, whereby the contact head 202d pushes up the stopper 203b-2. At this time, the ratchet wheel 203b-1 rotates while the protrusion 203b-4 is driven to rotate, thereby rotating the elastic switch 203b-5 out of the groove inside the protrusion 203b-4. At this time, the elastic switch 203b-5 presses the first guide plate 203b-6 to contact the second guide plate 203b-7, so that the circuit is turned on. At this point, the heating component 201 starts to operate and the internal temperature of the cabinet body 101 increases so that the 6SE70 frequency converter 103 is at the corresponding temperature.In summary, when the WK-20 / 35 electric shovel stops, the thermal sensing bimetallic sheet 202 detects a temperature change and deforms, and causes the stopper 203b-2 while causing the ratchet wheel 203b-1 to rotate to turn the elastic switch 203b-5 out of the groove inside the protrusion 203b-4, thereby pressing the first guide plate 203b-6 and contacting the second guide plate 203b-7 to turn on the circuit and start the heating component 201.Third EmbodimentReferring to FIGS. 1-11, the third embodiment of the present application differs from the previous embodiment in that it provides a differential gear set 203c. The differential gear set includes a first differential gear 203 c- 1 movably connected within the housing 203 a, a second differential gear 203 c- 2 movably connected within the housing 203 aand engaged with the first differential gear 203 c- 1, a third differential gear 203 c- 3 movably connected within the housing 203 aand engaged with the second differential gear 203 c- 2, a fourth differential gear 203 c- 4 movably connected within the housing 203 aand engaged with the third differential gear 203 c- 3, and a fifth differential gear 203 c- 5 movably connected within the housing 203 aand engaged with the fourth differential gear 203 c- 4.Further, the first differential gear 203 c- 1 includes a first large differential gear 203 c- 1 athat is movably connected inside the housing 203 aand a first small differential gear 203 c- 1 bthat is fixedly connected to one end of the first large differential gear 203 c- 1 a;The second differential gear 203c-2 comprises a second large differential gear 203c-2a movably connected within the housing 203a and a second small differential gear 203c-2b fixedly connected at one end of the second large differential gear 203c-2a;The third differential gear 203c-3 comprises a third large differential gear 203c-3a movably connected within the casing 203a and a third small differential gear 203c-3b fixedly connected at one end of the third large differential gear 203c-3a;The fourth differential gear 203c-4 comprises a fourth large differential gear 203c-4a movably connected within the casing 203a and a fourth small differential gear 203c-4b fixedly connected at one end of the fourth large differential gear 203c-4a;The fifth differential gear 203c-5 comprises a fifth large differential gear 203c-5a movably connected within the casing 203a and a fifth small differential gear 203c-5b fixedly connected at one end of the fifth large differential gear 203c-5a.In use, when the temperature decreases, the thermal sensing bimetallic sheet 202 detects the temperature change and contacts the ratchet short circuit switch 203b. The heating component 201 starts to operate. After a long time of operation, the inside temperature of the cabinet body 101 rises. The thermal sensing bimetallic sheet 202 is set back due to the temperature rise. However, under the cooperation of the respective differential gears in the differential gear set 203c with the ratchet wheel 203d, the elastic switch 203b-5 takes some time to separate the first guide plate 203b-6 from the second guide plate 203b-7. At this time, the heating component 201 still functions. The first guide disk 203 b- 6 and the second guide disk 203 b- 7 do not separate until the 6SE 70 frequency converter 103 has been heated to the corresponding temperature. The delay time can be adjusted depending on the number of teeth as well as the size and amount of the differential gears.In summary, by setting the differential gear set 203 c, the separation time between the first guide plate 203 b- 6 and the second guide plate 203 b- 7 has been extended, whereby the heating component 201 can heat the frequency converter 6SE 70 for a certain period of time before stopping the work, thereby significantly improving the production efficiency.It is important to note that the construction and arrangement of the present application shown in several different example embodiments are illustrative only. Although only some implementations are described in detail in this disclosure, those related to this disclosure should readily understand that many modifications are possible (such as changes in size, scale, structure, shape, and proportion, as well as parameter values (such as temperature, pressure, etc. of various components), installation arrangements, material usage, color, orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element formed as a whole may be comprised of multiple parts or components, the position of the element may be inverted or otherwise changed, and the characteristics, number, or position of individual components may be changed or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The sequence or order of any process or method steps may be changed or reordered based on alternative implementations. In the claims, any determination of "device plus function" is intended to cover the structure described in this application that performs the described function, and is not only structurally equivalent, but also an equivalent structure. Other substitutions, modifications, changes, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications which are still within the scope of the appended claims. In addition, in order to provide a brief description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not related to the presently considered best mode for carrying out the present utility model or those features that are not related to the practice of the present utility model).Note that the above embodiments are only for illustrating and not limiting the technical solutions of the present utility model. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be changed or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention, the change and replacement should be covered by the claims of the present invention.

Claims

A temperature control device for frequency converters of electric shovels, characterized in comprising an AFE rectifying cabinet (100) comprising a cabinet body (101), a cabinet door (102) fixedly connected to the cabinet body (101) by hinges, a frequency converter 6SE70 (103) fixedly connected inside the cabinet body (101), an air outlet (104) provided at the top of the cabinet body (101), and an air inlet (105) arranged at the top of the cabinet body (101); wherein at least twelve air inlets (105) are provided; a temperature control device (200) comprising a heating component (201) fixedly connected inside the cabinet body (101), a thermal sensing bimetallic sheet (202) fixedly connected inside the cabinet body (101), a delay short circuit switch (203) fixedly connected inside the cabinet body (101), a connecting rod component (204) fixedly connected inside the cabinet body (101), and a blocking plate (205) movably connected outside the cabinet body (101).The temperature control device for frequency converters of electric shovels according to claim 1, characterized in that the heating component (201) comprises a mounting base (201a) fixedly connected inside the cabinet body (101), a fan blade (201b) movably connected on the surface of the mounting base (201a), and a heating pipe (201c) fixedly connected inside the mounting base (201a); wherein the mounting base (201a) is connected to a negative terminal of the power supply to connect the fan blade (201b) in series to the heating pipe (201c).The temperature control device for frequency converters of electric shovels according to claim 2, characterized in that the thermal sensing bimetallic sheet (202) comprises a mounting seat (202a) fixedly connected inside the cabinet body (101), a copper sheet (202b) laser welded to one end of the mounting seat (202a), an iron sheet (202c) laser welded to one end of the mounting seat (202a), and a contact head (202d) fixedly connected to the copper sheet (202b) and the iron sheet (202c).The temperature control device for frequency converters of electric shovels according to claim 3, characterized in that a thermal expansion coefficient of the copper sheet (202b) is (16.6×10-6 / °C) and a thermal expansion coefficient of the iron sheet (202c) is (1.2×10-6 / °C), wherein when the temperature rises, the thermal expansion coefficient of the copper sheet (202b) is higher than that of the iron sheet (202c), so that the copper sheet (202b) shrinks more than the iron sheet (202c), and therefore the thermal sensing bimetallic sheet (202) will bend; and when the temperature falls, it will bend in the opposite direction.The temperature control device for frequency converters of electric shovels according to claim 4, characterized in that the delay short-circuiting switch (203) comprises a housing (203a) fixedly connected within the housing (101), a ratchet short-circuiting switch (203b) movably connected within the housing (203a), and a differential gear set (203c) movably connected within the housing (203a); wherein an outer surface of the housing (203a) is provided with a first (203a-1) and a second connector (203a-2), the first connector (203a-1) is connected to a positive pole of the power supply, and the second connector (203a-2) is connected to the mounting base (201a) via a wire and connects the fan blade (201b) to the heating pipe (201c) in series.The temperature control device for frequency converters of electric shovels according to claim 5, characterized in that the ratchet short-circuiting switch (203b) includes a ratchet wheel (203b-1) movably connected inside the housing (203a), a stopper (203b-2) fixedly connected on the rear side of the ratchet wheel (203b-1), a torsion spring (203b-3) fixedly connected to the ratchet wheel (203b-1) on the surface of the stopper (203b-2), a protrusion (203b-4) fixedly connected on the surface of the ratchet wheel (203b-1), an elastic switch (203b-5) fixedly connected inside the housing (203a) and movably cooperating with the outer surface of the protrusion (203b-4), a first guide washer (203b-6), which is fixedly connected inside the housing (203a) and comprises a second guide washer (203b-7) fixedly connected inside the housing (203a); wherein the first guide washer (203b-6) is connected to the first connector (203a-1) via the wire, and the second guide washer (203b-7) is connected to the second connector (203a-2) via the wire.The temperature control device for frequency converters of electric shovels according to claim 6, characterized in that the differential gear set (203c) includes a first differential gear (203c-1) movably connected within the housing (203a), a second differential gear (203c-2) movably connected within the housing (203a) and engaged with the first differential gear (203c-1), a third differential gear (203c-3) movably connected within the housing (203a) and engaged with the second differential gear (203c-2), a fourth differential gear (203c-4) movably connected within the housing (203a) and engaged with the third differential gear (203c-3), and a fifth differential gear (203c-5), which is movably connected within the housing (203a) and engaged with the fourth differential gear (203c-4).The temperature control device for frequency converters of electric shovels according to claim 6, characterized in that the first differential gear (203c-1) comprises a first large differential gear (203c-1a) movably connected within the housing (203a) and a first small differential gear (203c-1b) fixedly connected at one end of the first large differential gear (203c-1a); wherein the second differential gear (203c-2) comprises a second large differential gear (203c-2a) movably connected within the housing (203a) and a second small differential gear (203c-2b) fixedly connected at one end of the second large differential gear (203c-2a); wherein the third differential gear (203c-3) comprises a third large differential gear (203c-3a) movably connected within the casing (203a) and a third small differential gear (203c-3b) fixedly connected at one end of the third large differential gear (203c-3a); wherein the fourth differential gear (203c-4) comprises a fourth large differential gear (203c-4a) movably connected within the casing (203a) and a fourth small differential gear (203c-4b) fixedly connected at one end of the fourth large differential gear (203c-4a); wherein the fifth differential gear (203c-5) comprises a fifth large differential gear (203c-5a) movably connected within the casing (203a) and a fifth small differential gear (203c-5b) fixedly connected to one end of the fifth large differential gear (203c-5a).The temperature control device for frequency converters of electric shovels according to claim 8, characterized in that the connecting rod component (204) comprises a support rod (204a) fixedly connected inside the cabinet body (101), a lever (204b) movably connected at one end of the support rod (204a), and a contact point (204c) fixedly connected at one end of the cabinet body (101), wherein the support rod (204a) is connected with a positive pole wire, and the contact point (204c) is connected with the fan blade (201b) separately via the wire.The temperature control device for frequency converters of electric shovels according to any one of claims 1 to 9, characterized in that the surface of the blocking plate (205) is provided with a fixedly connected guide rod (205a), and a seal column (205b) movably connected to the same number of air inlets (105) is provided; the guide rod (205a) passing through and movably connected to the cabinet body (101).

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