Transmission part box body and eccentric transmission shaft subassembly combined structure

Abstract

The invention belongs to the technical field of reciprocating fluid conveying pumps, and particularly relates to a transmission part box body and eccentric transmission shaft subassembly combination structure. The invention provides a transmission part box body and eccentric transmission shaft subassembly combined structure which is good in use effect. The device comprises a transmission case 1, a crosshead 6, an eccentric transmission shaft subassembly 2 and a piston rod lubricating device 3 are arranged in the transmission case 1, and the device is characterized in that the front side of the crosshead 6 is connected with a piston rod 4 and a flange 5, and the piston rod 4 penetrates through the piston rod lubricating device 3; the small end of a connecting rod 21 on the front side of the eccentric transmission shaft subassembly 2 is connected with the crosshead 6 through a pin shaft bearing 7, and the two sides of a transmission shaft 24 on the rear side of the eccentric transmission shaft subassembly 2 are connected with the transmission case 1 through supporting bearings 9 on the two sides; the eccentric transmission shaft subassembly 2 is a crank connecting rod mechanism, the middle position of a transmission shaft 24 is connected with two oppositely-arranged crank eccentric balance weight wheels 23 in series, and the transmission shaft 24 is connected with the crank eccentric balance weight wheels 23 through keys 27.

Description

Technical Field

[0001] The invention belongs to the technical field of reciprocating fluid delivery pumps, and in particular relates to a transmission housing and an eccentric transmission shaft assembly structure. Background Art

[0002] Reciprocating slurry diaphragm pumps are positive displacement pumps designed for long-distance transport of solid-liquid two-phase media. They are widely used in industries such as mining, metallurgy, and chemical engineering. Their power transmission principle is a crank-connecting rod mechanism. The motor drives the transmission crankshaft within the transmission housing through a reduction gear mechanism. The crankshaft's crankshaft rotates, causing the large end of the connecting rod, which is connected to the small end of the crosshead, to rotate. As the crankshaft rotates, the connecting rod pushes the crosshead through a slideway within the transmission housing, producing reciprocating linear motion.

[0003] The existing double-cylinder reciprocating slurry diaphragm pump has a complicated manufacturing process, high production cost, occupies a large space in the equipment cavity, and is difficult to repair and disassemble due to the complex characteristics of its crank-connecting rod transmission mechanism.

[0004] The transmission housing is the shell that carries and transmits power. Due to its large-scale trend, the load-bearing capacity needs to be improved, and the original structure needs to be improved and strengthened. In the process of large-scale expansion, it is necessary to consider not only the load-bearing capacity, but also the rationality of the structure and the convenience of processing, as well as cost control. The eccentric transmission shaft assembly is a crank-connecting rod mechanism of a double-cylinder double-acting diaphragm pump and is one of the key components of its transmission. The existing eccentric transmission shaft assembly adopts a split assembly type. The transmission shaft and the connecting sleeve are hinged and connected by locating pins. The eccentric wheels on both sides are assembled with the transmission shaft and the connecting sleeve. The overall structure is complex, the eccentric wheel casting is irregular and difficult to process, and the running stability after assembly is poor. In addition, the eccentric transmission shaft assembly needs to be adjusted at an angle and tested when it is hoisted and installed into the housing. It relies heavily on the experience and technical level of the assemblers. Summary of the Invention

[0005] The present invention aims at solving the above problems and provides a transmission housing and an eccentric transmission shaft assembly structure with good use effect.

[0006] To achieve the above object, the present invention adopts the following technical solution, which includes a transmission case 1, in which a crosshead 6, an eccentric transmission shaft 2 and a piston rod lubricating device 3 are provided. The crosshead 6 is connected to the piston rod 4 and the flange 5 on the front side, and the piston rod 4 passes through the piston rod lubricating device 3;

[0007] The small end of the connecting rod 21 on the front side of the eccentric transmission shaft assembly 2 is connected to the crosshead 6 through the pin bearing 7, and both sides of the transmission shaft 24 on the rear side of the eccentric transmission shaft assembly 2 are connected to the transmission box 1 through the support bearings 9 on both sides;

[0008] The eccentric transmission shaft portion 2 is a crank-connecting rod mechanism, and two opposed crank eccentric counterweight wheels 23 are connected in series at the middle position of the transmission shaft 24. The transmission shaft 24 is connected to the crank eccentric counterweight wheel 23 through a key 27, and the key 27 is provided for position fixation and torque transmission; the crank eccentric counterweight wheel 23 is provided with an eccentric wheel connecting bolt through-hole, and the eccentric wheel connecting bolt 26 is inserted into the eccentric wheel connecting bolt through-hole, and the two crank eccentric counterweight wheels 23 are pre-tightened and fixed by the eccentric wheel connecting bolt 26 and the nut.

[0009] As a preferred solution, the crank eccentric counterweight wheel 23 of the present invention is an eccentric full-circle structure, and the phase angle β° between the eccentric position m of the large end of the connecting rod 21 and the counterweight position n of the crank eccentric counterweight wheel 23 is 45°.

[0010] As another preferred solution, the diameters of the holes at both ends of the eccentric wheel connecting bolt through-holes of the present invention are larger than the diameter of the middle part, and a bearing sleeve 25 is installed on the transmission shaft 24 outside the crank eccentric counterweight wheel 23, and the transmission shaft 24 and the bearing sleeve 25 are interference connected.

[0011] As another preferred embodiment, the transmission box 1 described in the present invention includes two main body side panels 11, the upper rear portion of the main body side panel 11 has a side panel connecting groove, a transmission shaft connecting plate 12 is arranged in the side panel connecting groove, and a through hole is provided on the transmission shaft connecting plate 12 corresponding to the rear transmission shaft 24 of the eccentric transmission shaft portion 2.

[0012] As another preferred solution, the front side of the transmission shaft connecting plate 12 of the present invention is a V-shaped structure 121 , the main body side plate 11 is provided with a V-shaped groove corresponding to the V-shaped structure 121 , and the V-shaped structure 121 is butt-welded to the V-shaped groove.

[0013] As another preferred embodiment, an outer support rib 14 is provided between the outer lower portion of the transmission shaft connecting plate 12 and the bottom of the transmission box 1 , and an inner support rib 19 is provided between the inner side of the transmission shaft connecting plate 12 and the inner wall of the transmission box 1 .

[0014] As another preferred solution, the transmission shaft connecting plate 12 of the present invention is stretched by the box body stretching bolt 13 through a hydraulic nut stretcher to provide pre-tightening force.

[0015] As another preferred embodiment, a transverse partition 16 with partition holes is provided at the front of the transmission case 1 of the present invention. The front side of the partition 16 is the piston rod lubrication box X, the middle part of the transmission case 1 behind the partition 16 is the crosshead sliding box Y, and the rear part of the transmission case 1 is the crankcase Z.

[0016] A longitudinal middle plate 15 is provided in the front middle portion of the transmission box 1 , and the middle plate 15 separates the piston rod lubrication box X and the crosshead sliding box Y into two chambers on both sides.

[0017] As another preferred embodiment, a crosshead sliding box rib plate 17 is provided on the inner wall of the transmission case 1 at the front end of the crankcase Z of the present invention, and a front side rib plate 18 is provided on the inner wall of the front end of the transmission case 1. The crosshead sliding box rib plate 17 and the front side rib plate 18 can improve the structural strength.

[0018] As another preferred embodiment, the crosshead sliding box rib plate 17 of the present invention includes a crosshead sliding box rib plate arranged in the middle and crosshead sliding box rib plates on both sides; the upper end or lower end of the middle crosshead sliding box rib plate is connected to the upper inner wall or the lower inner wall of the transmission box 1, and the side wall of the middle crosshead sliding box rib plate is connected to the middle plate 15; the upper end or lower end of the crosshead sliding box rib plates on both sides is connected to the upper inner wall or the lower inner wall of the transmission box 1, and the side walls of the crosshead sliding box rib plates on both sides are connected to the inner walls on both sides of the transmission box 1.

[0019] As another preferred solution, the front end of the front rib plate 18 of the present invention is connected to the front inner wall of the transmission case 1 , and the side wall of the front rib plate 18 is connected to the middle plate 15 .

[0020] As another preferred embodiment, the counterweight position n of the present invention is horizontal and vertical, the eccentric position m is set to the upper left 45° position, the vertical 12 o'clock direction is point a, the horizontal right 3 o'clock direction is point b, the vertical lower 6 o'clock direction is point c, and the horizontal left 9 o'clock direction is point d;

[0021] The key 27 is a single key or a double key; the single key groove is located at point c, and the double key groove is located at points b and d.

[0022] As another preferred embodiment, when the rotating parts of the eccentric transmission shaft assembly 2 of the present invention are counterweight balanced, the connecting rod 21 only considers the weight of the large end, and the size and position characteristics of the counterweight position n of the crank eccentric counterweight wheel 23 and the eccentric position m of the large end of the connecting rod 21 are set by three-dimensional software, so that the center of gravity position w of the rotating part of the eccentric transmission shaft assembly 2 coincides with the center line axis of the transmission shaft 24, and the assembly origin coordinate system set on the axis of the transmission shaft 24 coincides with the Y axis and Z axis of the center of gravity position w coordinate system.

[0023] As another preferred embodiment, when the eccentric transmission shaft assembly 2 of the present invention is installed in the transmission box 1, the lifting hole g of the crank eccentric counterweight wheel 23 is utilized, and the position of the lifting hole g is set to the point b and point d in the horizontal direction of the center line of the main shaft hole of the crank eccentric counterweight wheel 23 counterweight position n. The eccentric transmission shaft assembly 2 is installed in the transmission box 1 as a whole through the lifting tool A and the lifting balance tool B, the crosshead 6 is pushed to the front end of the crosshead sliding box Y, the small end of the connecting rod 21 is placed on the lower slide plate 8 (the lower slide plate 8 and the transmission box 1 are bolted together), and an insulator is placed between the lower slide plate 8 and the small end of the connecting rod 21. The center of gravity position w of the rotating part of the eccentric transmission shaft assembly 2 is vertical to the lifting hole g.

[0024] As another preferred embodiment, the piston rod lubrication device 3 of the present invention is assembled at the position of the partition 16 of the transmission box 1. The piston rod lubrication device 3 includes a seat plate 31, a pressure plate 33 and a sealing sleeve device 32. The seat plate 31 is positioned on the partition 16. The seat plate 31 is connected to the pressure plate 33 by a bolt 34. The sealing sleeve device 32 is embedded on the seat plate 31, and the piston rod 4 passes through the sealing sleeve device 32.

[0025] Secondly, the sealing sleeve device 32 of the present invention includes a sealing guide sleeve 321, a dust ring 322 and a sealing ring 323. The outer size of the sealing guide sleeve 321 is larger than the inner size of the sealing guide sleeve 321. The outer side of the sealing guide sleeve 321 is bolted and fixed to the seat plate 31. The inner side of the sealing guide sleeve 321 is placed in the central slot hole of the seat plate 31, and the inner end surface of the outer side of the sealing guide sleeve 321 is connected to the outer end surface of the outer periphery of the central slot hole of the seat plate 31; the outer end of the sealing guide sleeve 321 is provided with a stepped 324 dust ring 322 placement groove with a diameter gradually increasing from the outside to the inside, and the inner end of the sealing guide sleeve 321 is provided with a sealing ring 323 placement groove. A first lubrication hole 328 is provided on the seat plate 31 above the second lubrication hole 325, which is inclined from the outside to the inside. The upper end of the first lubrication hole 328 is a lubricating oil inlet i, and the lower end of the first lubrication hole 328 is connected to the oil exclusion space 327, and the oil exclusion space 327 surrounds the piston rod 4.

[0026] In addition, a second lubrication hole 325 connected to the piston rod 4 is provided in the middle of the sealing guide sleeve 321 of the present invention, and an oil drain hole 326 connected to the second lubrication hole 325 and arranged obliquely from the outside to the inside is provided on the seat plate 31 below the second lubrication hole 325; the oil drain space 327 is located on the inner side of the sealing ring 323.

[0027] The present invention has beneficial effects.

[0028] This invention addresses the trend toward larger-scale transmissions for twin-cylinder reciprocating slurry diaphragm pumps. By combining a novel transmission case design optimization with a series-mounted eccentric drive shaft assembly, and adding a piston rod lubrication device, it creates a power transmission system suitable for large-scale applications with high load ratios. Taking into account the design, processing, assembly, and cost optimization inherent in large-scale applications, this invention provides a transmission case and eccentric drive shaft assembly assembly with high structural strength and load-bearing capacity. It also offers a convenient assembly and hoisting method, reducing costs and increasing efficiency, and addressing the issue of relying on experience and personnel skills during the hoisting and assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0030] Figure 1 It is an overall three-dimensional structural diagram of the transmission part of the present invention.

[0031] Figure 2 It is a top sectional view of the entire transmission part of the present invention.

[0032] Figure 3 It is a schematic structural diagram of a transmission case of the present invention.

[0033] Figure 4 It is a three-dimensional sectional view of a transmission case of the present invention.

[0034] Figure 5 It is a three-dimensional structural diagram of the eccentric transmission shaft of the present invention.

[0035] Figure 6 It is a top sectional view of the eccentric transmission shaft of the present invention.

[0036] Figure 7 It is a schematic diagram of the crank eccentric counterweight wheel of the present invention.

[0037] Figure 8 It is a schematic diagram of the three-dimensional center of gravity balancing and the position of the eyelet holes of the rotating part of the eccentric transmission shaft assembly of the present invention.

[0038] Figure 9 It is a three-dimensional partial cross-sectional schematic diagram of the eccentric transmission shaft portion of the present invention when it is installed in the box body.

[0039] Figure 10 It is a three-dimensional partial sectional front view of the eccentric transmission shaft portion of the present invention when it is installed in the box.

[0040] Figure 11 It is a structural schematic diagram of the piston rod lubrication device of the present invention.

[0041] Markings in the figure: 1 is the transmission box, 2 is the eccentric transmission shaft assembly, 3 is the piston rod lubrication device, 4 is the piston rod, 5 is the flange, 6 is the crosshead, 7 is the pin bearing, 8 is the slide plate, and 9 is the support bearings on both sides.

[0042] Markings in the figure: X represents the piston rod lubrication box, Y represents the crosshead sliding box, and Z represents the crankcase.

[0043] Markings in the figure: 11 is the side plate, 12 is the transmission shaft connecting plate, 13 is the box body tension bolt, 14 is the outer supporting rib of the thick plate, 15 is the middle plate, 16 is the partition plate, 17 is the crosshead sliding box rib, 18 is the front side rib, and 19 is the inner supporting rib of the thick plate.

[0044] In the figure, reference numerals 21 are connecting rods, 22 are crank eccentric weight wheel bearings, 23 are crank eccentric weight wheel bearings, 24 are transmission shafts, 25 are bearing retaining sleeves, 26 are eccentric wheel connecting bolts, and 27 are keys.

[0045] Markings in the figure: Represents the center of gravity of the rotating part of the eccentric drive shaft.

[0046] In the figure, m represents the eccentric position of the large end of the connecting rod 21, n represents the counterweight position of the crank eccentric counterweight wheel, and β° represents the angle between the eccentric position and the eccentric position. Represents the lifting hole.

[0047] Markings in the figure: The dot represents the 12 o'clock direction. The dots represent 3 directions. The dot represents the 6 o'clock direction, The dot represents the 9 o'clock direction.

[0048] Markings in the figure: The dots represent lifting tools. Stands for lifting and balancing tool.

[0049] In the figure, reference numerals 31 denote a seat plate, 32 denotes a sealing sleeve device, 33 denotes a pressure plate, 34 denotes a bolt, 321 denotes a sealing guide sleeve, 322 denotes a dust ring, and 323 denotes a sealing ring.

[0050] Marked in the figure: port i represents the lubricating oil inlet of the piston rod lubrication device. DETAILED DESCRIPTION

[0051] As shown in the figure, the present invention includes a transmission box 1, in which a slide plate 8, a crosshead 6, an eccentric transmission shaft assembly 2 and a piston rod lubricating device 3 are provided. The front side of the crosshead 6 is connected to the piston rod 4 and the flange 5 (here is a conventional connection structure of the crosshead 6, the piston rod 4 and the flange 5, the crosshead 6 is bolted to the flange 5, and the end of the piston rod 4 is threadedly connected to the inner side of the flange 5). The piston rod 4 passes through the piston rod lubricating device 3;

[0052] The small end of the connecting rod 21 on the front side of the eccentric transmission shaft portion 2 is connected to the crosshead 6 through a pin bearing 7 (the pin bearing 7 can adopt a four-row roller bearing with a pin, and the pin is directly inserted into the holes on both sides of the crosshead 6, and the conical surface is matched). The two sides of the rear transmission shaft 24 of the eccentric transmission shaft portion 2 are connected to the transmission box 1 through support bearings 9 on both sides.

[0053] The transmission box 1 includes two main body side panels 11, and the upper rear portion of the main body side panels 11 has a side panel connecting groove, in which a transmission shaft connecting plate 12 is arranged. The transmission shaft connecting plate 12 is provided with a through hole corresponding to the rear transmission shaft 24 of the eccentric transmission shaft portion 2.

[0054] The transmission shaft connecting plate 12 can be made of thick steel plates with a thickness of 150-200 mm. The main body side plates 11 can be made of thin steel plates with a thickness of 20-30 mm. Using thick steel plates at the connection point to the transmission shaft (i.e., the transmission shaft connecting plate 12), rather than using thick steel plates for the entire transmission case 1, reduces the amount of overall structural processing, avoids material waste, and is cost-effective. The main body side plates 11 and the transmission shaft connecting plate 12 can be welded together.

[0055] The transmission case 1 is the entire shell, and all processes are completed by welding. The slide plate 8 and the crosshead 6 are installed. The front side of the crosshead 6 is fixedly connected with the piston rod 4 and the flange 5. The piston rod 4 passes through the piston rod lubrication device 3. The eccentric transmission shaft is installed as a whole through the lifting tool and lifting and balancing tools according to Figure 8 、 Figure 9 As shown, it is installed in the transmission box 1, the small end of the front connecting rod 21 of the eccentric transmission shaft 2 is connected to the crosshead 6 through the pin bearing 7, and the two sides of the rear transmission shaft 24 are fixed to the transmission box 1 by setting support bearings 9 on both sides.

[0056] The front side of the transmission shaft connecting plate 12 is a V-shaped structure 121, and the main body side plate 11 is provided with a V-shaped groove corresponding to the V-shaped structure 121. The V-shaped structure 121 and the V-shaped groove are butt-welded. The V-shaped structure 121 and the V-shaped groove are butt-welded, and the weld joint is strong and durable. The transmission shaft connecting plate 12 and the main body side plate 11 can be welded by open-cut welding (i.e., the V-shaped structure 121 and the V-shaped groove) on both sides. The transmission case 1 is a welded case body, and all steel plates can be connected by welding. Except for the V-shaped structure 121, the other steel plates can be welded by surfacing or fillet welding.

[0057] An outer support rib 14 is provided between the lower outer portion of the transmission shaft connecting plate 12 and the bottom of the transmission case 1, and an inner support rib 19 is provided between the inner side of the transmission shaft connecting plate 12 and the inner wall of the transmission case 1. The transmission shaft connecting plate 12 is scientifically arranged by the outer support rib 14 and the inner support rib 19 according to the laws of mechanics to enhance the structural strength.

[0058] The transmission case of the present invention utilizes a square structure of two thick plates (i.e., the drive shaft connecting plates 12) and a V-shaped weld design to significantly enhance the rigidity of the connection between the transmission case and the crankshaft. Furthermore, structural strength is enhanced by providing ribbed plates on the inner and outer sides of the thick plates, as well as upper and lower ribbed plates at the junction of the crankcase and crosshead sliding case. The resulting transmission case boasts superior strength, rigidity, and load-bearing capacity, making it suitable for use in powertrains with high load ratios. Compared to traditional castings, it is also lighter and less expensive.

[0059] The transmission shaft connecting plate 12 is preloaded by the housing tension bolts 13, which are stretched via a hydraulic nut tensioner to ensure housing stability during transmission operation. The installation of the housing tension bolts 13 and related components on the transmission shaft connecting plate 12 is conventional in the art, as described in Patent CN204200555U, a diaphragm pump power end housing, and Patent CN202591924U, an intermediate bearing cap removal tool.

[0060] A transverse partition 16 with partition holes is provided in the front of the transmission box 1. The front side of the partition 16 is the piston rod lubrication box X, the middle part of the transmission box 1 behind the partition 16 is the crosshead sliding box Y, and the rear part of the transmission box 1 is the crankcase Z.

[0061] A longitudinal intermediate plate 15 is installed in the front center of the transmission case 1. This plate separates the piston rod lubrication box X and the crosshead slide box Y into two chambers. The transmission section of the diaphragm pump embodiment of the present invention has a dual-cylinder structure, thus adopting a dual-chamber design. Furthermore, the isolation of the two chambers and the addition of the intermediate plate 15 enhance the strength of the welded structure.

[0062] A crosshead sliding box rib plate 17 is provided on the inner wall of the transmission case 1 at the front end of the crankcase Z, and a front side rib plate 18 is provided on the inner wall of the front end of the transmission case 1. Crosshead sliding box rib plate 17 and front side rib plate 18 are provided to improve structural strength.

[0063] The transmission case 1 is equipped with an intermediate plate 15, dividing the entire structure into two chambers. A partition 16 is then installed to separate the overall structure into three functional modules: the piston rod lubrication box X, the crosshead slide box Y, and the crankcase Z. The transmission case now has a monolithic frame structure. The addition of the crosshead slide box ribs 17 and the front side ribs 18 enhances the overall structural strength and load-bearing capacity, adapting to the trend toward larger units. The partition 16 ensures that the partition hole and the upper and lower arc surfaces of the crosshead slideway are bored in the same process, ensuring coaxiality and precision.

[0064] The transmission box is equipped with a crankcase, a crosshead sliding box, and a piston rod lubrication box. The crosshead sliding box and the piston rod lubrication box are separated by a partition. The thick plates on both sides of the crankcase are stretched by special tools through the box body tension bolts to give pre-tightening force to ensure the stability of the box during the operation of the transmission part.

[0065] The present invention adds a piston rod lubrication box and a partition, and arranges a piston rod lubrication device on the partition, which not only enhances the overall strength, but also increases the tooling through the partition position during the processing process, so that the piston rod lubrication device positioning through hole and the upper and lower arc surfaces of the crosshead slide are bored in the same process, ensuring coaxiality and increasing the precision of the transmission.

[0066] The crosshead sliding box rib plate 17 includes a crosshead sliding box rib plate arranged in the middle and crosshead sliding box rib plates on both sides; the upper end or lower end of the middle crosshead sliding box rib plate is connected to the upper inner wall or the lower inner wall of the transmission box 1, and the side wall of the middle crosshead sliding box rib plate is connected to the middle plate 15; the upper end or lower end of the crosshead sliding box rib plate on both sides is connected to the upper inner wall or the lower inner wall of the transmission box 1, and the side walls of the crosshead sliding box rib plates on both sides are connected to the inner walls on both sides of the transmission box 1.

[0067] The front end of the front rib plate 18 is connected to the front inner wall of the transmission case 1 , and the side wall of the front rib plate 18 is connected to the middle plate 15 .

[0068] The eccentric transmission shaft portion 2 is a crank-connecting rod mechanism, and two opposed crank eccentric counterweight wheels 23 are connected in series at the middle position of the transmission shaft 24. The transmission shaft 24 is connected to the crank eccentric counterweight wheel 23 through a key 27, and the key 27 is provided for position fixation and torque transmission; the crank eccentric counterweight wheel 23 is provided with an eccentric wheel connecting bolt through-hole, and the apertures at both ends of the eccentric wheel connecting bolt through-hole are larger than the aperture in the middle part. The eccentric wheel connecting bolt 26 is inserted into the eccentric wheel connecting bolt through-hole, and the two crank eccentric counterweight wheels 23 are pre-tightened and fixed by the eccentric wheel connecting bolt 26 and the nut. A bearing sleeve 25 is installed on the transmission shaft 24 outside the crank eccentric counterweight wheel 23, and the transmission shaft 24 and the bearing sleeve 25 are interference fit.

[0069] The crank eccentric counterweight wheel 23 is an eccentric full-circle structure, and the phase angle β° between the eccentric position m of the large end of the connecting rod 21 and the counterweight position n of the crank eccentric counterweight wheel 23 is 45°.

[0070] For a crank eccentric counterweight pulley with an eccentric full-circle structure, see the patent CN218564163U, "A Two-Phase Series Combined Eccentric Drive Shaft." The eccentric position m is a full-circle structure, while the counterweight position n is a full-circle structure. The distance between the centers of the two is the eccentric distance. The eccentric position m is where the large end of the connecting rod 21 is mounted, while the counterweight position n can be equipped with a key 27. The phase angle β° between the two is 45°.

[0071] The counterweight position n is in the horizontal vertical direction, the eccentric position m is set to the upper left 45° position, the vertical 12 o'clock direction is point a, the horizontal right 3 o'clock direction is point b, the vertical lower 6 o'clock direction is point c, and the horizontal left 9 o'clock direction is point d;

[0072] The key 27 is a single key or a double key; the single key groove is located at point c, and the double key groove is located at points b and d.

[0073] The eccentric transmission shaft 2 is a crank-connecting rod mechanism, and two opposed crank eccentric counterweight wheels 23 are connected in series in the middle position of the transmission shaft 24. A key 27 is provided for position fixation and torque transmission, and the eccentric wheel connecting bolt 26 is used for pre-tightening and fixing. A bearing sleeve 25 is installed on the outside of the crank eccentric counterweight wheel 23 for interference connection.

[0074] The crank eccentric counterweight wheel 23 is an eccentric full-circle regular structure, and its functions include connecting the eccentric position of the large end of the connecting rod 21. and the counterweight position of the connecting transmission shaft key 27 Eccentric position and counterweight position The phase angle β° is 45°. Figure 7 As shown, the counterweight position Horizontal and vertical directions, eccentric position Set to the upper left 45° position, at this time the vertical 12 o'clock direction is Point, the horizontal right 3 o'clock direction is Point, the 6 o'clock direction vertically below is Point, the horizontal left 9 o'clock direction is Furthermore, in order to ensure that the phase angle of the two opposed crank eccentric weight wheels 23 is 90° after assembly, the position of the key needs to be determined according to the number, and the position of the single keyway is set at point; double keyway position is set at Dot and point.

[0075] The eccentric drive shaft assembly of the present invention optimizes structural and process costs while enhancing the strength of the drive shaft through the circular design and positioning of the eccentric and counterweight positions of the crank eccentric counterweight wheel. Furthermore, it facilitates assembly and reduces the space occupied by the crankcase. By setting the location of the lifting holes and using a lifting tool, the entire assembly can be conveniently and quickly hoisted into the case without interference, saving time and effort and resolving the current constraints of relying on the experience and technical level of the assembly personnel.

[0076] When the rotating parts of the eccentric transmission shaft assembly 2 are counterweight balanced, the connecting rod 21 only considers the weight of the large end. The size and position characteristics of the counterweight position n of the crank eccentric counterweight wheel 23 and the eccentric position m of the large end of the connecting rod 21 are set through three-dimensional software (SOLIDWORKS three-dimensional software can be used), so that the center of gravity position w of the rotating part of the eccentric transmission shaft assembly 2 coincides with the center line axis of the transmission shaft 24, and the assembly origin coordinate system set on the axis of the transmission shaft 24 coincides with the Y axis and Z axis of the center of gravity position w coordinate system.

[0077] The specific steps for setting up the 3D software can be found in "A Simple Eccentric Wheel Counterweight Method" by Ji Xiaodong, Wang Xia, and Wu Wei in Heavy Machinery (bimonthly since 1953), 2010 Supplement 2 (Issue 298), 2010(s2), p. 252.

[0078] The rotating parts of the eccentric transmission shaft assembly 2 are all the parts in the eccentric transmission shaft assembly 2, including serial numbers 21, 22, 23, 24, 25, 26, and 27. It should be noted that when the serial number 21 connecting rod is used as the counterweight balance for the rotating parts, only the large end weight of the connecting rod 21 is considered, and the rest are removed and not considered. Figure 8 shown.

[0079] The eccentric transmission shaft assembly 2, the center of gravity of the rotating part is located on the center axis of the transmission shaft 24, to achieve a self-balancing state. Considering that the rest of the connecting rod except the big end in the rotating part moves in an arc and does not rotate, only the weight of the big end of the connecting rod is considered when balancing the counterweight. The counterweight position of the crank eccentric counterweight wheel is set by three-dimensional software. and eccentric position The size and position characteristics of the rotating part are realized to achieve the balance of the rotating part (i.e. the center of gravity position The axis of the transmission shaft is basically coincident with the centerline axis), thereby achieving a self-balancing state. At this time, the coordinate system of the assembly origin set on the axis of the transmission shaft 24 and the center of gravity position The Y-axis and Z-axis of the coordinate system basically coincide, and the X-axis size does not affect the rotational balance and is not considered.

[0080] When the eccentric transmission shaft assembly 2 is installed in the transmission box 1, the lifting hole of the crank eccentric counterweight wheel 23 needs to be used. Lifting hole The position of the crank eccentric counterweight wheel 23 is set to the counterweight position The horizontal direction of the spindle hole center line Dot and Point. Eccentric drive shaft assembly 2 as a whole through the lifting tool and lifting and balancing tools Install the transmission box 1, at this time, the crosshead 6 is pushed to the front end of the crosshead sliding box Y, and the small end of the connecting rod 21 is placed on the lower slide plate 8. A soft object such as a rag is placed between the lower slide plate 8 and the small end of the connecting rod 21 to prevent friction from damaging the slide. Figure 9 As shown, the center of gravity of the eccentric transmission shaft 2 is With lifting hole In vertical direction, when the eccentric transmission shaft part 2 is installed vertically, all parts do not interfere with each other. This method is the optimal solution for assembly.

[0081] The eccentric transmission shaft of the present invention is installed, and the crank eccentric counterweight wheel is an eccentric full-circle regular structure, and its functions include an eccentric position connecting the big end of the connecting rod and a counterweight position connecting the transmission shaft key. The phase angle between the eccentric position and the counterweight position is 45°, ensuring that when the two crank eccentric counterweight wheels are installed opposite each other, the phase angle is 90°.

[0082] The main shaft and the crank eccentric counterweight wheel of the present invention transmit torque dually through interference fit and key connection. The setting of the key position is required to ensure that the phase angle of the two opposing crank eccentric counterweight wheels is 90°. The number of keys can be 1 or 2. The single keyway position is set in the vertical direction of the crank eccentric counterweight wheel counterweight position (6 o'clock direction); the double keyway position is set in the horizontal direction of the crank eccentric counterweight wheel counterweight position (3 o'clock and 9 o'clock directions).

[0083] When the two crank eccentric counterweights of the present invention are mounted opposite each other, they are pre-tightened and secured by n eccentric wheel connecting bolts to ensure operational stability. Bearing retaining sleeves are installed on the outer sides of the two crank eccentric counterweights to form an interference fit, which not only increases the strength of the transmission shaft, but also adjusts the axial dimension and positions the support bearings on both sides of the transmission unit.

[0084] The eccentric transmission shaft assembly of the present invention has a center of gravity position of the rotating part located on the centerline axis of the transmission shaft, thereby achieving a self-balancing state. Considering that the rest of the connecting rod in the rotating part except the big end performs arc motion rather than rotational motion, only the weight of the big end of the connecting rod is considered when performing counterweight balancing. At this time, the size, shape, position and dimensions of the counterweight position and eccentric position of the crank eccentric counterweight wheel are changed through three-dimensional software to achieve the balancing of the rotating part of the eccentric transmission shaft assembly (that is, the center of gravity position basically coincides with the centerline axis of the transmission shaft), thereby achieving a self-balancing state.

[0085] The eccentric transmission shaft assembly of the present invention is provided with two lifting holes, which are arranged in the horizontal direction (3 o'clock and 9 o'clock directions) of the crank eccentric counterweight wheel counterweight position through the center line of the transmission shaft. The position is required to be vertically above the center of gravity of the assembly to ensure that the connecting rods on both sides are respectively located above and below the horizontal line position of the front end of the assembly during lifting. At this time, it is most convenient to install the entire assembly into the transmission box without interfering with the transmission box opening and the crosshead slide plate.

[0086] The eccentric drive shaft assembly includes a drive shaft, crank eccentric counterweight, connecting rod, bearing sleeve, eccentric connecting bolts, and key. The crank eccentric counterweight is assembled in series on the drive shaft, with the left and right sides fitted together using bearing sleeves for interference fit and axial dimension adjustment. The two crank eccentric counterweights are pre-tightened using eccentric connecting bolts, and a key is provided between the crank eccentric counterweight and the drive shaft to transmit torque. The eccentric drive shaft assembly is equipped with lifting holes to ensure the overall stability of the assembly during lifting, allowing for quick and easy installation into the transmission housing.

[0087] When the eccentric transmission shaft assembly 2 is installed in the transmission box 1, the lifting hole g of the crank eccentric counterweight wheel 23 is used. The position of the lifting hole g is set to the point b and point d in the horizontal direction of the center line of the main shaft hole of the crank eccentric counterweight wheel 23 counterweight position n. The eccentric transmission shaft assembly 2 is installed in the transmission box 1 as a whole through the lifting tool A and the lifting balance tool B. The crosshead 6 is pushed to the front end of the crosshead sliding box Y, and the small end of the connecting rod 21 is placed on the lower slide plate 8 (the lower slide plate 8 and the transmission box 1 are bolted together). An insulator is placed between the lower slide plate 8 and the small end of the connecting rod 21. The center of gravity position w of the rotating part of the eccentric transmission shaft assembly 2 is vertical to the lifting hole g.

[0088] One lifting hole, g, is located at point b on one crank eccentric counterweight 23, and the other lifting hole, g, is located at point d on the other crank eccentric counterweight 23. This two-point lifting ensures stable operation, with the crank eccentric counterweights 23 mounted opposite each other, and the two lifting points aligned. Points b and d are fully threaded during machining. After the opposing mounting, due to reversed mounting and angles, one lifting point is b and the other is d, with both holes on one side.

[0089] Lifting tool A can be a workshop-grade lifting rope or wire rope. Lifting and balancing tool B can be a round steel rod. Lifting tool A is hung on lifting and balancing tool B, with its lower end connected to lifting hole g. The lifting equipment drives lifting and balancing tool B upward.

[0090] The piston rod lubrication device 3 is assembled at the partition 16 position of the transmission box 1. The piston rod lubrication device 3 includes a seat plate 31, a pressure plate 33 and a sealing sleeve device 32. The seat plate 31 is positioned on the partition 16. The seat plate 31 is connected to the pressure plate 33 through a bolt 34. The sealing sleeve device 32 is embedded on the seat plate 31, and the piston rod 4 passes through the sealing sleeve device 32.

[0091] The sealing sleeve device 32 includes a sealing guide sleeve 321, a dust ring 322 and a sealing ring 323. The outer size of the sealing guide sleeve 321 is larger than the inner size of the sealing guide sleeve 321. The outer side of the sealing guide sleeve 321 is bolted and fixed to the seat plate 31. The inner side of the sealing guide sleeve 321 is placed in the central slot of the seat plate 31. The inner end surface of the outer side of the sealing guide sleeve 321 is connected to the outer end surface of the outer periphery of the central slot of the seat plate 31; the outer end of the sealing guide sleeve 321 is provided with a stepped 324 dust ring 322 placement groove with a diameter gradually increasing from the outside to the inside, and the inner end of the sealing guide sleeve 321 is provided with a sealing ring 323 placement groove. A first lubrication hole 328 is provided on the seat plate 31 above the second lubrication hole 325, which is inclined from the outside to the inside. The upper end of the first lubrication hole 328 is a lubricating oil inlet i, and the lower end of the first lubrication hole 328 is connected to the oil exclusion space 327, and the oil exclusion space 327 surrounds the piston rod 4.

[0092] A second lubrication hole 325 communicating with the piston rod 4 is provided in the middle of the sealing guide sleeve 321 , and an oil drain hole 326 communicating with the second lubrication hole 325 and arranged obliquely from the outside to the inside is provided on the seat plate 31 below the second lubrication hole 325 ; the oil drain space 327 is located inside the sealing ring 323 .

[0093] The stepped dust ring 324 can remove dust from the surface of the piston rod 4 without damaging the oil film on the piston rod 4, which is beneficial to the lubrication of the seal, has a good sealing effect, and is adaptable to different working environments and conditions, including different pressures, temperatures and movement speeds.

[0094] Lubricating oil enters from port i, flows directly to the surface of piston rod 4 and drain oil space 327, drain oil space 327 is the transmission box space (ie, area Y). Under normal circumstances, lubricating flushing oil enters from port i, falls to piston rod 4 and then falls into the transmission box.

[0095] Dust seal 322 and sealing ring 323 act as a seal to prevent the lubricating and flushing oil from port i from entering area X of the transmission case, and to prevent oil or dust from area X from entering area Y of the transmission case. If the seal fails or is not tight, some of the lubricating and flushing oil from port i will follow the movement of piston rod 4 and enter the gap between seat plate 31 and sealing guide sleeve 321. Second lubrication holes 325 (four second lubrication holes 325 can be provided around piston rod 4) collect the excess lubricating and flushing oil into the gap between sealing guide sleeve 321 and seat plate 31, where it is then discharged into the transmission case through oil drain hole 326 (similar to oil drain space 327).

[0096] Both dust ring 322 and sealing ring 323 can be Merkel seals. The internal piston rod 4 constantly moves back and forth linearly. To prevent heat and wear caused by friction during the movement of the piston rod 4, an outer lubrication hole (port i) is machined on the seat plate 31. This hole is connected to the hydraulic oil tank via a pipeline. The hydraulic oil is then delivered to the outer lubrication hole (port i) through the pipeline. The lubricating oil flows to the outer surface of the piston rod 4, carrying the hydraulic oil with it during its linear movement, thus reducing wear.

[0097] The transmission shaft is installed as a whole into the transmission box. Bearings are set on both sides of the thick plates on both sides of the transmission box for support. The big end of the connecting rod is fixed on the crank eccentric counterweight wheel bearing. The small end of the connecting rod is connected to the crosshead through a pin bearing. The crosshead is connected to the piston rod through a flange. A piston rod lubrication device is set between the piston rod and the transmission box.

[0098] The overall structure of the transmission part of the present invention is provided with a piston rod lubrication device, which is installed at the position of the transmission box partition to isolate the crosshead sliding box from the piston rod lubrication box. The piston rod lubrication device includes a seat plate, a sealing sleeve device, a pressure plate, and a bolt. The piston rod passes through the center hole of the sealing sleeve device. The sealing sleeve device is provided with a sealing guide sleeve, a dust ring, and a sealing ring, which plays a role in supporting and sealing the piston rod during operation. The seat plate is a circular structure, which is placed on the transmission box partition and is integrated with the transmission box through the pressure plate and bolts. The seat plate is provided with a flushing oil hole. By connecting the flushing lubricating oil, it is ensured that there is always flowing lubricating oil between the piston rod and the sealing guide sleeve, which plays a role in cooling and lubricating. The lubricating oil is isolated from the crosshead sliding box by the partition.

[0099] An embodiment of the present invention relates to a transmission part of a double-cylinder, double-acting reciprocating slurry diaphragm pump, which adopts a new type of housing and eccentric shaft assembly structure to form a typical crank-connecting rod mechanism transmission part. Compared with the existing technology, it has low manufacturing cost, stable mechanical performance, large load-bearing capacity, and easy disassembly and maintenance.

[0100] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the scope of protection of the present invention.

Claims

1. A transmission housing and an eccentric transmission shaft assembly structure, comprising a transmission housing (1), a crosshead (6), an eccentric transmission shaft assembly (2) and a piston rod lubricating device (3) arranged in the transmission housing (1), characterized in that The front side of the crosshead (6) is connected to the piston rod (4) and the flange (5), and the piston rod (4) passes through the piston rod lubricating device (3); The small end of the front connecting rod (21) of the eccentric transmission shaft assembly (2) is connected to the crosshead (6) through a pin bearing (7), and both sides of the rear transmission shaft (24) of the eccentric transmission shaft assembly (2) are connected to the transmission box (1) through support bearings (9) on both sides. The eccentric transmission shaft assembly (2) is a crank-connecting rod mechanism. Two opposed crank eccentric counterweight wheels (23) are connected in series at the middle position of the transmission shaft (24). The transmission shaft (24) is connected to the crank eccentric counterweight wheel (23) through a key (27). The key (27) is provided for position fixing and torque transmission. An eccentric wheel connecting bolt through-hole is provided on the crank eccentric counterweight wheel (23). The eccentric wheel connecting bolt (26) penetrates into the eccentric wheel connecting bolt through-hole. The two crank eccentric counterweight wheels (23) are pre-tightened and fixed by the eccentric wheel connecting bolt (26) and a nut.

2. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that The crank eccentric counterweight wheel (23) is an eccentric full-circle structure, and the phase angle β° between the eccentric position m of the large end of the connecting rod (21) and the counterweight position n of the crank eccentric counterweight wheel (23) is 45°.

3. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that The transmission box (1) comprises two main body side plates (11), the rear upper portion of the main body side plates (11) is provided with a side plate connecting groove, a transmission shaft connecting plate (12) is arranged in the side plate connecting groove, and a through hole is provided on the transmission shaft connecting plate (12) corresponding to the rear transmission shaft (24) of the eccentric transmission shaft portion (2).

4. The transmission housing and eccentric transmission shaft assembly structure according to claim 3, characterized in that The front side of the transmission shaft connecting plate (12) is a V-shaped structure (121), the main body side plate (11) is provided with a V-shaped groove corresponding to the V-shaped structure (121), and the V-shaped structure (121) and the V-shaped groove are butt-welded.

5. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that A transverse partition (16) with partition holes is provided in the front of the transmission box (1), the front side of the partition (16) is a piston rod lubrication box (X), the middle part of the transmission box (1) behind the partition (16) is a crosshead sliding box (Y), and the rear part of the transmission box (1) is a crankcase (Z); A longitudinal middle plate (15) is provided in the front middle portion of the transmission box (1), and the middle plate (15) separates the piston rod lubrication box (X) and the crosshead sliding box (Y) into two double chambers on both sides.

6. The transmission housing and eccentric transmission shaft assembly structure according to claim 5, characterized in that The front end of the front side rib plate (18) is connected to the front end inner wall of the transmission box (1), and the side wall of the front side rib plate (18) is connected to the middle plate (15).

7. The transmission housing and eccentric transmission shaft assembly structure according to claim 2, characterized in that The counterweight position n is in the horizontal vertical direction, the eccentric position m is set to the upper left 45° position, the vertical 12 o'clock direction is point a, the horizontal right 3 o'clock direction is point b, the vertical lower 6 o'clock direction is point c, and the horizontal left 9 o'clock direction is point d; The key (27) is a single key or a double key; the single key groove is located at point c, and the double key groove is located at points b and d.

8. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that When the rotating part of the eccentric transmission shaft assembly (2) is counterweighted and balanced, the connecting rod (21) only considers the weight of the large end, and the size and position characteristics of the counterweight position n of the crank eccentric counterweight wheel (23) and the eccentric position m of the large end of the connecting rod (21) are set by three-dimensional software, so that the center of gravity position w of the rotating part of the eccentric transmission shaft assembly (2) coincides with the center line axis of the transmission shaft (24), and the assembly origin coordinate system set on the axis of the transmission shaft (24) coincides with the Y axis and Z axis of the center of gravity position w coordinate system.

9. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that When the eccentric transmission shaft assembly (2) is installed in the transmission box (1), the lifting hole g of the crank eccentric counterweight wheel (23) is used, and the position of the lifting hole g is set to the point b and the point d in the horizontal direction of the center line of the main shaft hole of the crank eccentric counterweight wheel (23) counterweight position n; the eccentric transmission shaft assembly (2) is installed in the transmission box (1) as a whole through the lifting tool, the crosshead (6) is pushed to the front end of the crosshead sliding box Y, the small end of the connecting rod (21) is placed on the lower side slide plate (8), and an insulator is placed between the lower side slide plate (8) and the small end of the connecting rod (21); the center of gravity position w of the rotating part of the eccentric transmission shaft assembly (2) is in a vertical direction with the lifting hole g.

10. The transmission housing and eccentric transmission shaft assembly structure according to claim 1, characterized in that The piston rod lubricating device (3) is assembled at the position of the partition (16) of the transmission box (1). The piston rod lubricating device (3) includes a seat plate (31), a pressure plate (33) and a sealing sleeve device (32). The seat plate (31) is positioned on the partition (16). The seat plate (31) is connected to the pressure plate (33) through bolts (34). The sealing sleeve device (32) is embedded on the seat plate (31), and the piston rod (4) passes through the sealing sleeve device (32).

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