Gold mine mining and cleaning device

Abstract

The invention relates to the technical field of gold mine mining and cleaning, in particular to a gold mine mining and cleaning device which comprises a bottom plate, two parallel supports are fixedly arranged on the bottom plate, a supporting unit is fixedly arranged on the bottom plate and comprises a bottom rod fixedly arranged on the bottom plate, a supporting plate is fixedly arranged on the bottom rod, and the supporting plate is fixedly arranged on the bottom rod. By arranging the cleaning unit, fine sand, mud and useless impurities can be separated and discharged through first filtering holes and second filtering holes in the outer circumferential faces of the first inner shell and the second inner shell in the cleaning process, and it is guaranteed that the fine impurities such as the mud and ore can be discharged in a separated mode in the cleaning process; and meanwhile, the knocking rod is used for knocking the discharging plate, and the situation that impurities adhere to the inner wall of the discharging plate, and consequently the follow-up ore cleaning work is affected is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gold mining cleaning, in particular to a gold mining cleaning device. Background Art

[0002] Gold mining refers to the process of exploration, development and mining of underground or surface gold deposits. The mining methods are divided into open-pit mining and underground mining according to the burial depth of the ore body and geological conditions. Open-pit mining is suitable for shallow ore bodies, and the ore is directly obtained by stripping the surface soil and rocks; underground mining is through digging shafts, tunnels, etc. to mine deep underground. The mined gold ore usually contains a large amount of impurities and surrounding rocks, and needs to be initially cleaned to remove surface soil and gravel.

[0003] After the gold sand particles are crushed, there may still be residual sludge on the surface, which needs further cleaning. Usually, water washing, screening and other methods are used to remove impurities and improve the purity of the gold sand particles. The ore cleaning device usually consists of a feed port, a cleaning tank, a spraying device and a discharge port. The ore enters the cleaning tank through the feed port, where physical or chemical reactions are carried out to remove impurities and dirt on the surface of the ore.

[0004] In the process of gold mining, ore types are mainly separated according to the occurrence state of gold, mineral composition and associated minerals. Pyrite belongs to a type that will appear in the mining process. Gold and pyrite are closely combined. This type of ore mixture is also called sulfide gold ore. And because of the high density and strong toughness of pyrite, the materials produced in the mining process of sulfide gold ore are mostly large pieces of irregular ore body sand particles, and the surface of the ore body sand particles is irregular and difficult to be fully cleaned. During the cleaning process, the sand particles are easy to pile up together, resulting in incomplete cleaning of the gold ore sand particles. Summary of the invention

[0005] Based on the above problems existing in the prior art, the problem to be solved by the present application is that it is difficult to carry out comprehensive cleaning according to the rules, and during the cleaning process, the sand particles are easily piled up together, resulting in incomplete cleaning of the gold ore sand particles.

[0006] The technical solution adopted by the present application to solve the technical problem is: a gold mining cleaning device, comprising a bottom plate, two mutually parallel brackets are fixedly arranged on the bottom plate, and a supporting unit is fixedly arranged on the bottom plate: A cleaning unit, the cleaning unit comprises an outer shell fixedly arranged between the two brackets, an inner shell 1 fixedly arranged in the outer shell, an inner shell 2 fixedly arranged in the inner shell 1, a positioning plate fixedly arranged in the inner shell 2, a connecting shaft rotatably arranged on the positioning plate, a crushing roller fixedly arranged on the outer circumferential surface of the connecting shaft, a gear ring fixedly arranged on the inner wall of the inner shell 2, a spiral blade 1 rotatably arranged between the outer shell and the inner shell 1, a spiral blade 2 rotatably arranged between the inner shell 1 and the outer shell, a connecting plate fixedly arranged between the spiral blade 1 and the spiral blade 2, and a spiral blade 3 fixedly arranged on the gear ring, the cleaning unit is used for classifying and cleaning gold ore sand particles.

[0007] Preferably, a support unit is fixedly arranged on the bottom plate, and the support unit includes a bottom rod fixedly arranged on the bottom plate, a support plate is fixedly arranged on the bottom rod, a cross plate is fixedly arranged on the support plate, a support frame is fixedly arranged on the cross plate, four support columns parallel to each other are fixedly arranged on the bottom plate, and each of the support columns is evenly distributed at each corner of the bottom plate, and an anti-slip pad is fixedly arranged on the bottom end of each of the support columns.

[0008] Preferably, a reinforcement plate is installed on the outer circumferential surface of the outer shell, a material baffle plate is fixedly provided on the outer circumferential surfaces of the inner shell one and the inner shell two, a material hopper for adding materials is fixedly provided in the inner shell two, and a material discharge plate is fixedly provided at the bottom end of the outer shell.

[0009] Preferably, a large gear is fixedly arranged on the connecting shaft, a servo motor is fixedly arranged on the bracket, a shaft body is fixedly arranged on the output end of the servo motor, a transmission gear 1 is fixedly arranged on the output end of the shaft body, a transmission gear 2 is fixedly arranged on the connecting shaft, and a reinforcement plate is fixedly arranged between the outer shell, the inner shell 1 and the inner shell 2.

[0010] Preferably, an adjusting gear 1 is on the outer circumference of the inner shell 1, an adjusting gear 2 is fixedly arranged on the outer circumference of the inner shell 2, a long shaft is rotatably arranged on the outer circumference of the spiral blade 1, a transmission gear 3 meshing with the adjusting gear 1 is fixedly arranged on the outer circumference of the long shaft, and a stirring plate is fixedly arranged on the outer circumference of the long shaft.

[0011] Preferably, a plurality of evenly arranged filter holes 1 are provided on the outer circumferential surface of the inner shell 1, and a filter hole 2 is provided on the outer circumferential surface of the inner shell 2, and the diameter of the filter hole 2 is greater than the diameter of the filter hole 1.

[0012] Preferably, a reducer is fixedly arranged on the transverse plate, a positioning frame is fixedly arranged on the transverse plate, and two rotating shafts parallel to each other are rotatably arranged on the positioning frame, and the output end of the reducer is fixedly connected to the rotating shaft.

[0013] Preferably, a disc 1 is fixedly provided on the horizontal plate, and the disc 1 is rotatably connected to the rotating shaft. A sliding groove is provided on the disc 1, and a slide plate is slidably provided in the sliding groove. A knocking rod is fixedly provided on the slide plate, and a spring is fixedly provided between the bottom end of the slide plate and the bottom end of the sliding groove. A disc 2 is fixedly provided on the outer circumferential surface of the rotating shaft, and a guide groove is provided on the disc 2. A limiting shaft is fixedly provided on the side wall of the slide plate, and the limiting shaft is slidably connected to the guide groove.

[0014] Preferably, the guide groove is composed of a straight groove and an arc groove, and the straight groove and the arc groove are connected to each other at their ends.

[0015] Preferably, pulleys are fixedly provided on the outer circumferential surfaces of the two rotating shafts, and the two pulleys are connected via a belt transmission.

[0016] The beneficial effect of the present application is that the present application provides a gold mining cleaning device, which, by setting a cleaning unit, can separate and discharge some fine sand, mud and useless impurities through filter holes one and filter holes two on the outer peripheral surfaces of inner shell one and inner shell two during the cleaning process, thereby ensuring that fine impurities such as mud can be separated and discharged from the ore during the cleaning process, thereby ensuring the overall cleanliness of the ore, and at the same time, using a knocking rod to knock the unloading plate to prevent impurities from adhering to the inner wall of the unloading plate and affecting subsequent ore cleaning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 It is a front view structural schematic diagram of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the structure of the cleaning unit of the present invention; Figure 6 It is a schematic diagram of the structure of the inner shell 1 and the inner shell 2 of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the local structure of the present invention.

[0018] In the figure: 1, bottom plate; 11, support column; 12, anti-skid pad; 2, bracket; 21, servo motor; 211, shaft; 2111, transmission gear 1; 212, connecting plate; 22, bottom rod; 23, support plate; 24, cross plate; 25, reducer; 26, positioning frame; 27, rotating shaft; 271, pulley; 2711, disc 1; 272, slide plate; 273, knock rod; 274, limit shaft; 275, spring; 276, disc 2; 277, guide groove; 3, support frame; 4 , outer shell; 41, material baffle; 42, material hopper; 43, reinforcement plate; 44, material discharge plate; 5, inner shell one; 51, adjustment gear one; 52, filter hole one; 6, inner shell two; 61, adjustment gear two; 62, positioning plate; 621, connecting shaft; 622, transmission gear two; 623, large gear; 63, crushing roller; 64, gear ring; 7, spiral blade one; 71, long shaft; 711, transmission gear three; 72, stirring plate; 8, spiral blade two; 81, filter hole two; 9, spiral blade three. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] Reference Figure 1-Figure 4 A gold mining cleaning device comprises a bottom plate 1, two brackets 2 parallel to each other are fixedly arranged on the bottom plate 1, a supporting unit is fixedly arranged on the bottom plate 1, the supporting unit comprises a bottom rod 22 fixedly arranged on the bottom plate 1, a supporting plate 23 is fixedly arranged on the bottom rod 22, a horizontal plate 24 is fixedly arranged on the supporting plate 23, and a supporting frame 3 is fixedly arranged on the horizontal plate 24; The cleaning unit includes an outer shell 4 rotatably arranged on the support frame 3, an inner shell 1 5 is fixedly arranged in the outer shell 4, an inner shell 2 6 is fixedly arranged in the inner shell 1 5, and the outer shell 4, the inner shell 1 5 and the inner shell 2 6 are coaxially arranged, a positioning plate 62 is fixedly arranged in the inner shell 2 6, a connecting shaft 621 is rotatably arranged on the positioning plate 62, a crushing roller 63 is fixedly arranged on the outer circumferential surface of the connecting shaft 621, a gear ring 64 is fixedly arranged on the inner wall of the inner shell 2 6, a large gear 623 matching the gear ring 64 is fixedly arranged on the connecting shaft 621, a servo motor 21 is fixedly arranged on the bracket 2, a shaft body 211 is fixedly arranged on the output end of the servo motor 21, a transmission gear 1 2111 is fixedly arranged on the output end of the shaft body 211, a transmission gear 2 622 meshing with the transmission gear 1 2111 is fixedly arranged on the connecting shaft 621, and a reinforcement plate 43 is fixedly arranged between the outer shell 4, the inner shell 1 5 and the inner shell 2 6.

[0022] Reference Figure 1-Figure 3 Four mutually parallel support columns 11 are fixedly arranged on the base plate 1, and each support column 11 is evenly arranged at each corner of the base plate 1. An anti-skid pad 12 is fixedly arranged on the bottom end of the support column 11. By arranging the support column 11 on the base plate 1, the support function of the entire device is realized. At the same time, each support column 11 is arranged at the corner of the base plate 1 so that each support column 11 can be evenly stressed during the support process, thereby avoiding damage to the support column 11 due to uneven stress during the support process. At the same time, the anti-skid pad 12 arranged at the bottom end of the support column 11 can increase the friction between the device and the ground, thereby avoiding the device from slipping during use.

[0023] Reference Figure 1-Figure 3 A reinforcement plate 43 is installed on the outer circumferential surface of the outer shell 4, and a baffle plate 41 is fixedly arranged on the outer circumferential surfaces of the inner shell 1 5 and the inner shell 2 6. A discharge hopper 42 for adding materials is fixedly arranged in the inner shell 2 6, and a discharge plate 44 is fixedly arranged at the bottom end of the outer shell 4. The reinforcement plate 43 is arranged between the inner shell 1 5 and the inner shell 2 6 to improve the overall stability of the device. At the same time, the baffle plates 41 on the inner shell 1 5 and the inner shell 2 6 are used to separate and collect the materials separated from each chamber to ensure that the cleaned ore will not be contaminated for the second time.

[0024] Reference Figure 5-Figure 7A spiral blade 17 is rotatably arranged between the outer shell 4 and the inner shell 15, a spiral blade 28 is rotatably arranged between the inner shell 15 and the outer shell 4, and a connecting plate 212 is fixedly arranged between the spiral blade 17 and the spiral blade 28. By setting the spiral blade 17 between the outer shell 4 and the inner shell 15, the spiral blade 3 9 is fixedly arranged on the gear ring 64, so that when the device is in operation, the spiral blade 17 and the spiral blade 28 can push the material in the corresponding chamber so that it can be discharged to the discharge port of the device, and the rotation direction of the spiral blade 3 9 is set opposite to the rotation direction of the spiral blade 17 and the spiral blade 28, so that the ore passing through the lower hopper 42 can be pushed into the interior of the inner shell 2 6 through the spiral blade 3 9, and the ore crushed in the inner shell 2 6 can be pushed outward through the spiral blade 28 in the chamber between the inner shell 2 6 and the inner shell 15.

[0025] Reference Figure 2-Figure 4 , an adjusting gear 51 is arranged on the outer circumference of the inner shell 5, an adjusting gear 2 61 is fixedly arranged on the outer circumference of the inner shell 2 6, a long shaft 71 is rotatably arranged on the outer circumference of the spiral blade 7, a transmission gear 3 711 meshing with the adjusting gear 51 is fixedly arranged on the outer circumference of the long shaft 71, and a stirring plate 72 is fixedly arranged on the outer circumference of the long shaft 71. By means of the adjusting gear 51 arranged on the outer circumference of the inner shell 5 and the adjusting gear 2 61 on the inner shell 2 6, the spiral blade 7 can drive the transmission gear 3 711 to mesh and rotate with the adjusting gear 51 during rotation, thereby driving the stirring plate 72 fixedly arranged on the outer circumference of the long shaft 71 to rotate, so that the material in the chamber can be stirred, and the material can be separated more evenly.

[0026] Reference Figure 5-Figure 7 A plurality of evenly distributed filter holes 52 are provided on the outer circumferential surface of the inner shell 1 5, a filter hole 81 is provided on the outer circumferential surface of the inner shell 2 6, and the diameter of the filter hole 81 is larger than the diameter of the filter hole 52. By setting the filter holes 52 and the filter holes 81 on the inner shell 1 5 and the inner shell 2 6, the separation and processing of materials of different sizes in the cleaning process is realized.

[0027] Reference Figure 1 and Figure 8A reducer 25 is fixedly arranged on the horizontal plate 24, a positioning frame 26 is fixedly arranged on the horizontal plate 24, and two rotating shafts 27 parallel to each other are rotatably arranged on the positioning frame 26, the output end of the reducer 25 is fixedly connected with the rotating shaft 27, a disc 1 2711 is fixedly arranged on the horizontal plate 24, and the disc 1 2711 is rotatably connected with the rotating shaft 27, a sliding groove is provided on the disc 1 2711, a slide plate 272 is slidably provided in the sliding groove, a knocking rod 273 is fixedly arranged on the slide plate 272, a spring 275 is fixedly arranged between the bottom end of the slide plate 272 and the bottom end of the sliding groove, a disc 2 276 is fixedly arranged on the outer circumference of the rotating shaft 27, a guide groove 277 is provided on the disc 276, and the side wall of the slide plate 272 A slide plate 272 is fixedly provided on the upper side and a limit shaft 274 is fixedly provided thereon, and the limit shaft 274 is slidably connected to the guide groove 277. When the staff starts the reducer 25, the rotating shaft 27 fixedly provided on the output end of the reducer 25 rotates, and the rotating rotating shaft 27 can drive the disk 276 fixedly connected thereto to rotate, and through the guide groove 277 provided on the disk 276, when the limit shaft 274 slides in the arc groove in the guide groove 277, the limit shaft 274 compresses the spring 275 and controls the knocking rod 273 to contract, and when the limit shaft 274 slides to the linear groove, the elastic force generated by the spring 275 can push the knocking rod 273 to restore, and the knocking rod 273 knocks the blanking plate 44.

[0028] Reference Figure 6-Figure 8 The guide groove 277 is composed of a straight groove and an arc groove, and the ends of the straight groove and the arc groove are connected to each other. By setting the guide groove 277 to be composed of a straight groove and an arc groove, the knocking frequency of the knocking rod 273 can be controlled.

[0029] Reference Figure 1 and Figure 8 , pulleys 271 are fixedly arranged on the outer circumferences of the two rotating shafts 27, and the two pulleys 271 are connected by belt transmission. The pulleys 271 and belts arranged between the two rotating shafts 27 ensure that the two rotating shafts 27 can rotate synchronously, and the blanking plates 44 on both sides of the shell 4 can be knocked to prevent impurities from adhering to the inner wall of the blanking plates 44.

[0030] The specific scheme is as follows: when the staff uses the device, they first move the device to a suitable position, and through the support column 11 set on the bottom plate 1, the support function of the entire device is realized to ensure the stability of the entire device, and the ore to be cleaned is poured into the lower hopper 42 of the device, and the servo motor 21 is started. The rotating servo motor 21 can drive the shaft body 211 fixedly connected thereto to rotate, and the rotating shaft body 211 can control the rotation of the crushing roller 63 through the connecting plate 212 and the transmission gear 2 622. The rotating crushing roller 63 can perform secondary crushing processing on some ores with larger particles. The ores after crushing and cleaning will enter different chambers due to the different particle sizes. The spiral blade 1 7 and the spiral blade 2 8 can push the materials in the corresponding chambers so that they can be discharged toward the discharge port of the device. During the rotation process, the spiral blade 1 7 can drive the transmission gear 2 622 to rotate. The wheel three 711 meshes with the adjusting gear one 51 and rotates, thereby driving the stirring plate 72 fixedly arranged on the outer peripheral surface of the long shaft 71 to rotate, so that it can stir the materials in the chamber and ensure that the materials can be separated more evenly. When the reducer 25 is started in the process of discharging impurities from the outer shell 4, the rotating shaft 27 fixedly arranged on the output end of the reducer 25 rotates. The rotating rotating shaft 27 can drive the disk two 276 fixedly connected thereto to rotate, and through the guide groove 277 provided on the disk two 276, when the limit shaft 274 slides in the arc groove in the guide groove 277, the limit shaft 274 compresses the spring 275 and controls the knocking rod 273 to contract. When the limit shaft 274 slides to the straight groove, the elastic force generated by the spring 275 can push the knocking rod 273 to restore, and the knocking rod 273 knocks the blanking plate 44 to prevent impurities from adhering to the inner wall of the blanking plate 44.

[0031] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary, and within the spirit of the present invention, the technical features in the above embodiments or in different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0032] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gold mining cleaning device, comprising a bottom plate (1), on which two mutually parallel brackets (2) are fixedly arranged, and on which a supporting unit is fixedly arranged, characterized in that: Also includes: A cleaning unit, the cleaning unit comprising an outer shell (4) fixedly arranged between two brackets (2), an inner shell 1 (5) fixedly arranged in the outer shell (4), an inner shell 2 (6) fixedly arranged in the inner shell 1 (5), a positioning plate (62) fixedly arranged in the inner shell 2 (6), a connecting shaft (621) rotatably arranged on the positioning plate (62), a crushing roller (63) fixedly arranged on the outer peripheral surface of the connecting shaft (621), a toothed ring (64) fixedly arranged on the inner wall of the inner shell 2 (6), a spiral blade 1 (7) rotatably arranged between the outer shell (4) and the inner shell 1 (5), a spiral blade 2 (8) rotatably arranged between the inner shell 1 (5) and the outer shell (4), a connecting plate (212) fixedly arranged between the spiral blade 1 (7) and the spiral blade 2 (8), and a spiral blade 3 (9) fixedly arranged on the toothed ring (64), the cleaning unit is used for classifying and cleaning gold ore grains.

2. A gold mining cleaning device according to claim 1, characterized in that: The support unit comprises a bottom rod (22) fixedly arranged on the bottom plate (1), a support plate (23) fixedly arranged on the bottom rod (22), a cross plate (24) fixedly arranged on the support plate (23), a support frame (3) fixedly arranged on the cross plate (24), four mutually parallel support columns (11) fixedly arranged on the bottom plate (1), and each of the support columns (11) is evenly distributed at each corner of the bottom plate (1), and an anti-slip pad (12) is fixedly arranged on the bottom end of each of the support columns (11).

3. A gold mining cleaning device according to claim 1, characterized in that: A reinforcing plate (43) is installed on the outer circumference of the outer shell (4), a material blocking plate (41) is fixedly arranged on the outer circumference of the inner shell 1 (5) and the inner shell 2 (6), a material discharge hopper (42) for adding materials is fixedly arranged in the inner shell 2 (6), and a material discharge plate (44) is fixedly arranged at the bottom end of the outer shell (4).

4. A gold mining cleaning device according to claim 1, characterized in that: A large gear (623) is fixedly arranged on the connecting shaft (621), a servo motor (21) is fixedly arranged on the bracket (2), a shaft body (211) is fixedly arranged on the output end of the servo motor (21), a transmission gear 1 (2111) is fixedly arranged on the output end of the shaft body (211), a transmission gear 2 (622) is fixedly arranged on the connecting shaft (621), and a reinforcement plate (43) is fixedly arranged between the outer shell (4), the inner shell 1 (5) and the inner shell 2 (6).

5. A gold mining cleaning device according to claim 4, characterized in that: An adjusting gear 1 (51) is disposed on the outer circumference of the inner shell 1 (5); an adjusting gear 2 (61) is fixedly disposed on the outer circumference of the inner shell 2 (6); a long shaft (71) is rotatably disposed on the outer circumference of the spiral blade 1 (7); a transmission gear 3 (711) meshing with the adjusting gear 1 (51) is fixedly disposed on the outer circumference of the long shaft (71); and a stirring plate (72) is fixedly disposed on the outer circumference of the long shaft (71).

6. A gold mining cleaning device according to claim 1, characterized in that: The outer circumference of the inner shell one (5) is provided with a plurality of evenly arranged filter holes one (52), the outer circumference of the inner shell two (6) is provided with filter holes two (81), and the diameter of the filter holes two (81) is greater than the diameter of the filter holes one (52).

7. A gold mining cleaning device according to claim 2, characterized in that: A reducer (25) is fixedly arranged on the transverse plate (24), a positioning frame (26) is fixedly arranged on the transverse plate (24), and two rotating shafts (27) parallel to each other are rotatably arranged on the positioning frame (26), and an output end of the reducer (25) is fixedly connected to the rotating shaft (27).

8. A gold mining cleaning device according to claim 7, characterized in that: A disc 1 (2711) is fixedly arranged on the horizontal plate (24), and the disc 1 (2711) is rotatably connected to the rotating shaft (27). A sliding groove is provided on the disc 1 (2711), and a slide plate (272) is slidably arranged in the sliding groove. A knocking rod (273) is fixedly arranged on the slide plate (272), and a spring (275) is fixedly arranged between the bottom end of the slide plate (272) and the bottom end of the sliding groove. A disc 2 (276) is fixedly arranged on the outer circumference of the rotating shaft (27), and a guide groove (277) is provided on the disc 2 (276). A limit shaft (274) is fixedly arranged on the side wall of the slide plate (272), and the limit shaft (274) is slidably connected to the guide groove (277).

9. A gold mining cleaning device according to claim 8, characterized in that: The guide groove (277) is composed of a straight groove and an arc groove, and the straight groove and the arc groove are connected to each other at their ends.

10. A gold mining cleaning device according to claim 7, characterized in that: Belt pulleys (271) are fixedly arranged on the outer circumferential surfaces of the two rotating shafts (27), and the two belt pulleys (271) are connected via a belt transmission.

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