Milling machine provided with waste gas waste heat recovery mechanism and used for machining heat exchanger partition plate

Abstract

The utility model discloses a heat exchanger partition plate machining milling machine with a waste gas waste heat recovery mechanism, and relates to the technical field of heat exchanger partition plate milling machining. The heat exchanger partition plate machining milling machine comprises a base, the top of the base is fixedly connected with a fixing frame, the fixing frame is connected with a lifting assembly, and the lifting assembly is connected with a milling assembly; the milling assembly comprises a milling cutter. During use, oil mist waste gas generated by milling is sucked into the heat exchange box through the gas suction cover by the arranged waste heat recovery assembly, then cold water is introduced into the heat exchange pipe, so that dividing wall heat exchange between the high-temperature oil mist waste gas and the cold water in the heat exchange pipe is realized, and heat in the high-temperature oil mist waste gas is conducted into the cold water; the cold water is heated to complete waste heat recovery of the high-temperature oil mist waste gas, and the heated water can be used for bathing and clothes washing of workers or used as a preheating medium of other equipment needing to be preheated in a workshop, so that the waste heat of the high-temperature oil mist waste gas is recovered and reused.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger baffle milling technology, and in particular to a milling machine for processing heat exchanger baffles with a waste heat recovery mechanism. Background Technology

[0002] During the production process, multiple through holes need to be milled into the heat exchanger baffle plate using a milling cutter so that the heat exchange medium can flow into the heat exchange pipe through the through holes in the baffle plate to exchange heat with the liquid that needs to be heated.

[0003] During the milling of heat exchanger baffles, the cutting fluid generates tiny droplets and vapors between the high-speed rotating tool or workpiece due to pump circulation, jetting, and high-temperature evaporation. These vapors further condense into oil mist exhaust gas, which is flammable and explosive, posing a threat to the environment and human health. Therefore, it is necessary to recycle and treat these high-temperature oil mist exhaust gases.

[0004] Existing milling machines, when recovering waste gas, directly suck up the high-temperature oil mist waste gas and send it directly to purification equipment such as filtration, adsorption and chemical decomposition for purification treatment. As a result, the high temperature of the oil mist waste gas itself is lost during the purification process, and the high temperature of the oil mist waste gas cannot be recovered and reused, resulting in energy loss. Utility Model Content

[0005] The purpose of this utility model is to provide a milling machine for processing heat exchanger partitions with a waste heat recovery mechanism, so as to solve the problem mentioned in the background art that the existing display screen shock absorption protection structure occupies a large space, which may hinder the movement of passengers in the carriage and reduce the practicality of the shock absorption protection structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a milling machine for processing heat exchanger baffles with a waste heat recovery mechanism, comprising a base, a fixed frame fixedly connected to the top of the base, a lifting assembly connected to the fixed frame, a milling assembly connected to the lifting assembly, the milling assembly including a milling cutter, a front-to-back moving assembly provided on the base, a left-to-right moving assembly connected to the front-to-back moving assembly, a worktable connected to the top of the left-to-right moving assembly, a liquid pump connected to the lifting assembly, a liquid spray pipe connected to the output end of the liquid pump, the liquid delivery end of the liquid spray pipe aligned with the bottom end of the milling cutter, a suction hood connected to the lifting assembly, and a waste heat recovery assembly connected to the base via a fixed plate;

[0007] The waste heat recovery assembly includes a heat exchange box fixedly connected to the top of the fixed plate. Multiple U-shaped heat exchange tubes are connected equidistantly from top to bottom inside the heat exchange box. The liquid inlet and liquid outlet of the heat exchange tubes both penetrate the front side wall of the heat exchange box and extend to the outside of the heat exchange box. The waste heat recovery assembly also includes a first auxiliary heat exchange mechanism disposed inside the heat exchange box.

[0008] Preferably, multiple first partitions are fixedly connected from bottom to top on the left inner wall of the heat exchange box, with gaps between the right sides of the multiple first partitions and the right inner wall of the heat exchange box. Multiple second partitions are fixedly connected from bottom to top on the right inner wall of the heat exchange box, with gaps between the right sides of the multiple second partitions and the left inner wall of the heat exchange box. The multiple first partitions and multiple second partitions are staggered vertically, and the multiple first partitions and multiple second partitions are staggered vertically with the multiple heat exchange tubes. The advantage of this arrangement is that the cooperation of the multiple first partitions and multiple second partitions allows the oil mist exhaust gas to flow in an S-shape from the bottom to the top of the heat exchange box, thereby extending the travel distance of the oil mist exhaust gas in the heat exchange box and improving the heat exchange effect between the oil mist exhaust gas and the cold water flowing in the heat exchange tubes.

[0009] Preferably, the first auxiliary heat exchange mechanism includes multiple pairs of crossbars fixedly connected at equal intervals from top to bottom to the inner rear wall of the heat exchange box. The multiple pairs of crossbars and multiple heat exchange tubes are staggered. Multiple pairs of horizontal plates are movably sleeved between the outer peripheral surfaces of the multiple pairs of crossbars at equal intervals from top to bottom. Multiple rectangular grooves are opened from left to right at the bottom of the horizontal plates. The multiple rectangular grooves are movably sleeved on the outer wall of the nearest heat exchange tube. The first auxiliary heat exchange mechanism also includes a first driving unit provided on the heat exchange box. The first driving unit is used to drive each pair of horizontal plates to move back and forth in opposite directions. The advantage of this arrangement is that the oil mist exhaust gas can come into more complete contact with the outer wall of the heat exchange tube, and the heat of the oil mist exhaust gas can be more fully conducted to the cold water in the heat exchange tube through the outer wall of the heat exchange tube, further improving the heat exchange effect and thus improving the recovery effect of the waste heat of the oil mist exhaust gas.

[0010] Preferably, the first drive unit includes a first motor fixedly connected to the top of the heat exchange box. The output end of the first motor is fixedly connected to a first rotating shaft through the top wall of the heat exchange box. Multiple rotating plates are fixedly sleeved on the outer circumferential surface of the first rotating shaft from top to bottom. The outer sides of the multiple rotating plates respectively abut against the adjacent sides of multiple pairs of horizontal plates. Two first elastic elements are symmetrically fixedly connected between the adjacent sides of each pair of horizontal plates. The advantage of this arrangement is that it can stably drive each pair of horizontal plates to move back and forth in opposite directions.

[0011] Preferably, the heat exchange box is further provided with a second auxiliary heat exchange assembly. The second auxiliary heat exchange assembly includes multiple mounting cavities opened from left to right on the front of each horizontal plate. Each of the multiple mounting cavities is connected to a set of stirring blades. The second auxiliary heat exchange assembly also includes two sets of second rotating shafts symmetrically rotatably connected to the top of the two uppermost horizontal plates. The bottom ends of the two sets of second rotating shafts penetrate the two uppermost horizontal plates and extend to their lower sides. The other horizontal plates located on the lower side are symmetrically and movably sleeved on the outer circumferential surfaces of the two sets of second rotating shafts. A set of stirring blades in each mounting cavity is rotatably connected to the outer circumferential surface of the second rotating shafts penetrating the mounting cavity. The second auxiliary heat exchange assembly also includes a second drive unit connected in the heat exchange box. The second drive unit is used to drive the two sets of second rotating shafts to rotate. The advantage of this arrangement is that the oil mist exhaust gas can more fully contact the outer wall of the heat exchange tube, further improving the recovery efficiency of the waste heat of the oil mist exhaust gas.

[0012] In summary, the technical effects and advantages of this utility model are as follows:

[0013] 1. In this utility model, the waste heat recovery component draws the oil mist exhaust gas generated during milling into the heat exchange box through the suction hood. Then, cold water is introduced into the heat exchange tube, enabling heat exchange between the high-temperature oil mist exhaust gas and the cold water in the heat exchange tube. This allows the heat in the high-temperature oil mist exhaust gas to be transferred to the cold water, heating the water to complete the waste heat recovery of the high-temperature oil mist exhaust gas. The heated water can be used for workers to shower and wash clothes or as a preheating medium for other equipment in the workshop that requires preheating. This achieves the recovery and reuse of waste heat from the high-temperature oil mist exhaust gas, effectively reducing energy consumption and improving the economy and environmental friendliness of the milling machine.

[0014] 2. In this utility model, the first auxiliary heat exchange mechanism enables the first drive unit to drive each pair of horizontal plates to move back and forth in opposite directions, thereby changing the front and rear positions of the horizontal plates in the heat exchange box. Combined with the rectangular grooves opened on the horizontal plates, the flow position of the oil mist exhaust gas as it flows through the gap between the adjacent first and second partitions can be continuously changed. This allows the oil mist exhaust gas to come into more full contact with the outer wall of the heat exchange tube, and the heat of the oil mist exhaust gas to be more fully conducted to the cold water in the heat exchange tube through the outer wall of the heat exchange tube, further improving the heat exchange effect and thus improving the recovery effect of the waste heat of the oil mist exhaust gas. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the first structure of a milling machine for processing heat exchanger partitions with a waste heat recovery mechanism in an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the second structure of a milling machine for processing heat exchanger partitions with a waste heat recovery mechanism in an embodiment of the present utility model.

[0018] Figure 3 This is a partial cross-sectional view of the waste heat recovery component in an embodiment of the present invention;

[0019] Figure 4 This is a partial structural schematic diagram of the waste heat recovery component in an embodiment of this utility model;

[0020] Figure 5 As an embodiment of this utility model Figure 3 Enlarged diagram of point A in the middle.

[0021] In the diagram: 1. Base; 11. Fixing frame; 2. Lifting assembly; 3. Milling assembly; 31. Milling cutter; 4. Forward and backward moving assembly; 5. Left and right moving assembly; 6. Worktable; 7. Liquid pump; 71. Spray pipe; 81. Suction hood; 82. Suction pipe; 83. Hose; 84. Suction pump; 9. Waste heat recovery assembly; 91. Heat exchanger; 911. First partition; 912. Second partition; 92. Heat exchanger tube; 93. First... Auxiliary heat exchange mechanism; 931, crossbar; 932, cross plate; 933, rectangular groove; 934, first drive unit; 9341, first motor; 9342, first rotating shaft; 9343, rotating plate; 9344, first elastic element; 94, second auxiliary heat exchange assembly; 941, mounting cavity; 942, second rotating shaft; 943, stirring blade; 944, second drive unit; 9441, drive wheel; 9442, drive bar. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Please refer to Figures 1-5The milling machine shown includes a heat exchanger baffle processing machine with a waste heat recovery mechanism, comprising a base 1, a fixed frame 11 fixedly connected to the top of the base 1, a lifting assembly 2 connected to the fixed frame 11, a milling assembly 3 connected to the lifting assembly 2, the milling assembly 3 including a milling cutter 31, a front-back moving assembly 4 provided on the base 1, a left-right moving assembly 5 connected to the front-back moving assembly 4, a worktable 6 connected to the top of the left-right moving assembly 5, a liquid pump 7 connected to the lifting assembly 2, the output end of the liquid pump 7 connected to a spray pipe 71, the liquid delivery end of the spray pipe 71 aligned with the bottom end of the milling cutter 31, an air suction hood 81 connected to the lifting assembly 2, and a waste heat recovery assembly 9 connected to the base 1 via a fixed plate.

[0025] An air suction pump 84 is installed on the lower right side of the heat exchange box 91. The output end of the air suction pump 84 is connected to the right side wall of the heat exchange box 91 through an air supply pipe. The input end of the air suction pump 84 is connected to a hose 83. The end of the hose 83 away from the air suction pump 84 is connected to an air suction pipe 82. The air suction pipe 82 is fixedly connected to the lifting assembly 2. The air inlet end of the air suction pipe 82 is connected to the air suction hood 81. Through the hose 83 and the air suction pipe 82, the air suction hood 81 can move up and down synchronously with the milling cutter 31 under the drive of the lifting assembly 2, thereby ensuring that the air suction hood 81 can fully suck the oil mist exhaust gas generated during milling into the heat exchange box 91.

[0026] The waste heat recovery assembly 9 includes a heat exchange box 91 fixedly connected to the top of the fixed plate. The bottom of the heat exchange box 91 is connected to a waste liquid pipe (not shown in the figure), which is used to discharge the wastewater after heat exchange and condensation in the heat exchange box 91. The top of the heat exchange box 91 is connected to an exhaust pipe (not shown in the figure), which is used to discharge the oil mist exhaust gas that has not yet condensed after heat exchange. Multiple U-shaped heat exchange tubes 92 are connected at equal intervals from top to bottom inside the heat exchange box 91. The liquid inlet and liquid outlet of the heat exchange tubes 92 both penetrate the front side wall of the heat exchange box 91 and extend to the outside of the heat exchange box 91. The waste heat recovery assembly 9 also includes a first auxiliary heat exchange mechanism 93 provided inside the heat exchange box 91.

[0027] refer to Figure 3 and Figure 5 Multiple first partitions 911 are fixedly connected from bottom to top on the left inner wall of the heat exchange box 91. A gap is left between the right side of the multiple first partitions 911 and the right inner wall of the heat exchange box 91. Multiple second partitions 912 are fixedly connected from bottom to top on the right inner wall of the heat exchange box 91. A gap is left between the right side of the multiple second partitions 912 and the left inner wall of the heat exchange box 91. The multiple first partitions 911 and multiple second partitions 912 are staggered vertically. The multiple first partitions 911 and multiple second partitions 912 are staggered vertically with the multiple heat exchange tubes 92.

[0028] Specifically, the combination of multiple first baffles 911 and multiple second baffles 912 allows the oil mist exhaust gas to flow in an S-shape from the bottom to the top of the heat exchange box 91, thereby extending the travel distance of the oil mist exhaust gas within the heat exchange box 91 and improving the heat exchange effect between the oil mist exhaust gas and the cold water flowing inside the heat exchange tube 92.

[0029] refer to Figures 3-5 The first auxiliary heat exchange mechanism 93 includes multiple pairs of crossbars 931 fixedly connected at equal intervals from top to bottom to the inner rear side of the heat exchange box 91. The multiple pairs of crossbars 931 and multiple heat exchange tubes 92 are staggered. Multiple pairs of horizontal plates 932 are movably sleeved between the outer peripheral surfaces of the multiple pairs of crossbars 931 at equal intervals from top to bottom. Multiple rectangular grooves 933 are opened from left to right at the bottom of the horizontal plates 932. The multiple rectangular grooves 933 are movably sleeved on the outer wall of the nearest heat exchange tube 92. The first auxiliary heat exchange mechanism 93 also includes a first drive unit 934 provided on the heat exchange box 91. The first drive unit 934 is used to push each pair of horizontal plates 932 to move back and forth in opposite directions.

[0030] Specifically, the first drive unit 934 drives each pair of horizontal plates 932 to move back and forth in opposite directions, which can change the front and rear positions of the horizontal plates 932 in the heat exchange box 91. In conjunction with the rectangular slots 933 opened on the horizontal plates 932, the flow position of the oil mist exhaust gas as it flows through the gap between the adjacent first partition 911 and second partition 912 can be continuously changed. This allows the oil mist exhaust gas to come into more full contact with the outer wall of the heat exchange tube 92, so that the heat of the oil mist exhaust gas can be more fully conducted through the outer wall of the heat exchange tube 92 to the cold water inside the heat exchange tube 92, further improving the heat exchange effect and thus improving the recovery effect of the waste heat of the oil mist exhaust gas.

[0031] refer to Figure 3 and Figure 4 The first drive unit 934 includes a first motor 9341 fixedly connected to the top of the heat exchange box 91. The output end of the first motor 9341 passes through the top wall of the heat exchange box 91 and is fixedly connected to a first rotating shaft 9342. Multiple rotating plates 9343 are fixedly sleeved from top to bottom on the outer circumferential surface of the first rotating shaft 9342. The outer sides of the multiple rotating plates 9343 respectively abut against the adjacent sides of multiple pairs of horizontal plates 932. Two first elastic elements 9344 are symmetrically fixedly connected between the adjacent sides of each pair of horizontal plates 932.

[0032] Specifically, the first motor 9341 drives the first rotating shaft 9342 to rotate, and the first rotating shaft 9342 drives multiple rotating plates 9343 to rotate. Under the elastic force of the first elastic element 9344, the sides of multiple pairs of horizontal plates 932 that are close to each other are always pressed against the outer surfaces of multiple rotating plates 9343. In this way, each pair of horizontal plates 932 can be stably driven to move back and forth in opposite directions.

[0033] refer to Figures 3-5The heat exchange box 91 is also provided with a second auxiliary heat exchange assembly 94. The second auxiliary heat exchange assembly 94 includes multiple mounting cavities 941 opened from left to right on the front of each horizontal plate 932. Each mounting cavity 941 is connected to a set of stirring blades 943. The second auxiliary heat exchange assembly 94 also includes two sets of second rotating shafts 942 symmetrically rotatably connected to the top of the two uppermost horizontal plates 932. The bottom ends of the two sets of second rotating shafts 942 penetrate through the two uppermost horizontal plates 932 and extend to their lower side. The other horizontal plates 932 located on the lower side are symmetrically and movably sleeved on the outer peripheral surface of the two sets of second rotating shafts 942. A set of stirring blades 943 in the mounting cavity 941 is rotatably connected to the outer peripheral surface of the second rotating shafts 942 that penetrate the mounting cavity 941. The second auxiliary heat exchange assembly 94 also includes a second drive unit 944 connected in the heat exchange box 91. The second drive unit 944 is used to drive the two sets of second rotating shafts 942 to rotate.

[0034] Specifically, the second drive unit 944 drives two sets of second rotating shafts 942 to rotate. The second rotating shafts 942 can drive the stirring blades 943 to rotate. Combined with the forward and backward movement of the horizontal plate 932, the stirring blades 943 can fully stir the oil mist exhaust gas flowing through the heat exchange box 91, so that the oil mist exhaust gas can come into more full contact with the outer wall of the heat exchange tube 92, further improving the recovery efficiency of the waste heat of the oil mist exhaust gas.

[0035] The second drive unit 944 includes a drive wheel 9441 fixedly connected to the top of the second rotating shaft 942. The second drive unit 944 also includes multiple drive bars 9442 fixedly connected at equal intervals from left to right to the bottom of the uppermost first partition 911. The outer peripheral surfaces of the multiple sets of drive wheels 9441 respectively abut against the left side surfaces of the multiple drive bars 9442. In this way, when the horizontal plate 932 moves back and forth, the drive bars 9442 can drive the drive wheel 9441 to rotate. The drive wheel 9441 drives the stirring blade 943 to rotate through the second rotating shaft 942. In this way, the stirring blade 943 can be driven to rotate without an additional power source, which reduces the energy consumption of the milling machine and improves the economy and practicality of the milling machine.

[0036] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat exchanger partitioning machine with exhaust gas waste heat recovery mechanism, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected with a fixing frame (11), the fixing frame (11) is connected with a lifting assembly (2), the lifting assembly (2) is connected with a milling assembly (3), the milling assembly (3) comprises a milling cutter (31), the base (1) is provided with a front and rear moving assembly (4), the front and rear moving assembly (4) is connected with a left and right moving assembly (5), the left and right moving assembly (5) is connected with a workbench (6) at the top, the lifting assembly (2) is connected with a liquid pump (7), the output end of the liquid pump (7) is communicated with a liquid injection pipe (71), the liquid injection pipe (71) is aligned with the bottom end of the milling cutter (31), the lifting assembly (2) is connected with an air suction cover (81), the base (1) is connected with a waste heat recovery assembly (9) through a fixed plate; The waste heat recovery assembly (9) comprises a heat exchange box (91) fixedly connected to the top of the fixed plate, a plurality of U-shaped heat exchange pipes (92) are connected equidistantly in the heat exchange box (91) from top to bottom, the liquid inlet end and the liquid outlet end of the heat exchange pipe (92) both penetrate the front side wall of the heat exchange box (91) and extend to the outside of the heat exchange box (91), and the waste heat recovery assembly (9) further comprises a first auxiliary heat exchange mechanism (93) arranged in the heat exchange box (91).

2. The miller for heat exchanger partitioning with exhaust gas waste heat recovery mechanism according to claim 1, characterized in that: A plurality of first partition plates (911) are fixedly connected to the left inner wall of the heat exchange box (91) from top to bottom, gaps are left between the right side surfaces of the plurality of first partition plates (911) and the right inner wall of the heat exchange box (91), a plurality of second partition plates (912) are fixedly connected to the right inner wall of the heat exchange box (91) from top to bottom, gaps are left between the right side surfaces of the plurality of second partition plates (912) and the left inner wall of the heat exchange box (91), the plurality of first partition plates (911) and the plurality of second partition plates (912) are staggered in the up-down direction, and the plurality of first partition plates (911) and the plurality of second partition plates (912) are staggered with the plurality of heat exchange pipes (92) in the up-down direction.

3. The machine according to claim 2, characterized in that it comprises a heat exchanger (3) for recovering the waste heat of the machine. The first auxiliary heat exchange mechanism (93) comprises a plurality of pairs of cross rods (931) fixedly connected equidistantly on the rear inner wall of the heat exchange box (91) from top to bottom, the plurality of pairs of cross rods (931) and the plurality of heat exchange pipes (92) are staggered, a plurality of pairs of cross plates (932) are movably sleeved equidistantly on the outer circumferential surfaces of the plurality of pairs of cross rods (931) from top to bottom, a plurality of rectangular grooves (933) are formed in the bottom of the cross plate (932) from left to right, the plurality of rectangular grooves (933) are movably sleeved on the outer walls of the nearest heat exchange pipes (92) respectively, and the first auxiliary heat exchange mechanism (93) further comprises a first driving unit (934) arranged on the heat exchange box (91), and the first driving unit (934) is used for driving each pair of cross plates (932) to move reciprocally and oppositely.

4. The machine according to claim 3, characterized in that: The first driving unit (934) comprises a first motor (9341) fixedly connected at the top of the heat exchange box (91), an output end of the first motor (9341) is fixedly connected with a first rotating shaft (9342) penetrating through the top wall of the heat exchange box (91), a plurality of rotating plates (9343) are fixedly sleeved on the outer circumferential surface of the first rotating shaft (9342) from top to bottom, and the outer side surfaces of the plurality of rotating plates (9343) are respectively tightly abutted against the adjacent side surfaces of the plurality of pairs of horizontal plates (932); and two first elastic members (9344) are symmetrically fixedly connected between the adjacent side surfaces of each pair of two horizontal plates (932).

5. The machine according to claim 4, characterized in that it comprises a heat exchanger. The heat exchange box (91) is further provided with a second auxiliary heat exchange assembly (94), the second auxiliary heat exchange assembly (94) comprises a plurality of installation cavities (941) opened in the front of each horizontal plate (932) from left to right, a group of stirring blades (943) are connected in the plurality of installation cavities (941); the second auxiliary heat exchange assembly (94) further comprises two groups of second rotating shafts (942) which are symmetrically and rotatably connected at the top of the uppermost two horizontal plates (932), bottom ends of the two groups of second rotating shafts (942) penetrate through the uppermost two horizontal plates (932) and extend to the lower side of the uppermost two horizontal plates (932), the other horizontal plates (932) on the lower side are symmetrically movably sleeved on the outer circumferential surfaces of the two groups of second rotating shafts (942), the group of stirring blades (943) in the installation cavity (941) is rotatably connected on the outer circumferential surface of the second rotating shaft (942) penetrating through the installation cavity (941), and the second auxiliary heat exchange assembly (94) further comprises a second driving unit (944) connected in the heat exchange box (91), the second driving unit (944) is used for driving the two groups of second rotating shafts (942) to rotate.

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