CN217370367U - Trolley running mechanism of casting machine - Google Patents

Abstract

The utility model aims to solve the problem of the prior art that the trolley produces frictional resistance with the track when the casting machine trolley moves on straight track, make the trolley easily produce the card pause and arch up not enough, provide a casting machine trolley operation mechanism, adopt the utility model discloses casting machine trolley operation mechanism, owing to make the trolley move on the straight rail of downward sloping, consequently, the gravity of trolley is decomposed into the component of two directions, a component is parallel unanimous with the direction of moving ahead of trolley with the straight rail, as the power of going ahead, a component forms frictional resistance and the opposite direction that the trolley goes ahead with straight rail is perpendicular, and the running resistance of trolley on straight rail has reduced, and the power of moving under the circumstances of the drive power that does not increase drive arrangement increases to some extent, makes the trolley move more smoothly, can effectively reduce jamming, more energy-conservation.

Description

Trolley running mechanism of casting machine

Technical Field

The utility model belongs to the technical field of metal and alloy metal continuous casting, especially, relate to casting machine platform truck running gear.

Background

A continuous casting machine is a device for cold casting molten metal alloy onto a mold and producing a block material after cooling and solidification in the metal smelting industry, and a trolley continuously runs on a running track. In the prior art, a method that a head wheel is adopted to pull a trolley to move forwards and a rear trolley pushes a front trolley to move forwards is adopted to enable the trolley to move from the head of a continuous casting machine to the tail of the continuous casting machine on an annular track and then move from the tail to the head of the continuous casting machine; in addition, because the trolley runs on a straight track and generates friction force between the tracks, the trolley may be blocked when running on the track, the front wheels of the trolley are lifted to form arch between the trolleys due to the fact that the trolley behind is blocked to move forwards, the trolley runs unsmoothly, and molten metal is poured out to cause that the casting operation cannot be performed smoothly. Therefore, the common solution is to increase the driving power of the head wheel and the advancing driving force of the trolley, or adopt the way of arranging the pressing rail on the upper part of the rail, but the methods have large energy consumption and complex structure, are inconvenient to replace the trolley and are not economical.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a casting machine platform truck operation when going on straight track and track production frictional resistance to prior art casting machine platform truck, make the platform truck easily produce the card pause the not enough of arching, provide a casting machine platform truck operating device.

The utility model aims at realizing through the following technical scheme:

a trolley running mechanism of a casting machine comprises annular tracks which are arranged in parallel in pairs and are used for running the trolley, wherein each annular track consists of an upper straight track, a lower straight track, a head bent track and a tail bent track, at least one pair of straight tracks in the upper straight track and the lower straight track are obliquely arranged, so that the trolley runs on the straight tracks which are obliquely inclined downwards, the maximum inclination angle of each straight track is smaller than or equal to the angle of overflow of molten metal in the downward inclination direction of a front-edge mould of a mould cavity when the molten metal is cast into the mould cavity and/or the angle of overflow from the mould cavity in the downward inclination direction of the mould in the mould cavity after the mould cavity is filled with the molten metal and before the molten metal is cooled;

the head curved rail and the tail curved rail are both U-shaped, the head curved rail comprises an upper straight rail section, a head corner arc section upper part, a head middle arc section, a head corner arc section lower part and a head curved rail lower straight rail section which are sequentially arranged, the upper straight rail section of the head curved rail is in tangent connection with the upper end of the head corner arc section, the upper end of the head middle arc section is connected with the upper end of the head corner arc section through a connecting straight rail, the lower end of the head middle arc section is in tangent connection with the upper end of the head corner arc section, and the lower end of the head corner arc section is in tangent connection with the lower straight rail section of the head curved rail; the tail curved rail comprises an upper straight rail section, an upper tail corner arc section, a middle tail arc section, a lower tail corner arc section and a lower straight rail section of the tail curved rail, which are sequentially arranged, wherein the upper straight rail section of the tail curved rail is in tangent connection with the upper end of the tail corner arc section, the upper end of the middle tail arc section is in tangent connection with the upper end of the tail corner arc section, the lower end of the middle tail arc section is in tangent connection with the lower straight rail section of the tail curved rail, the lower end of the tail corner arc section is in tangent connection with the lower straight rail section of the head curved rail, the upper straight rail section of the head curved rail is connected with the head end of the upper straight rail, the lower straight rail section of the head curved rail is connected with the head end of the lower straight rail, and the upper straight rail section of the tail curved rail is connected with the tail end of the upper straight rail, the lower straight rail section of the tail bent rail is connected with the tail end of the lower straight rail;

when the upper straight rail is obliquely arranged, the head bent rail inclines downwards towards the tail bent rail, the upper straight rail section of the head bent rail and the upper straight rail section of the tail bent rail are obliquely arranged, the inclination direction is consistent with the inclination direction of the upper straight rail, when the lower straight rail is obliquely arranged, the tail bent rail inclines downwards towards the head bent rail, the lower straight rail section of the head bent rail and the lower straight rail section of the tail bent rail are obliquely arranged, and the inclination direction is consistent with the inclination direction of the lower straight rail;

the upper straight rail and the lower straight rail are both obliquely arranged;

the inclination angle of the upper straight rail and the lower straight rail is less than or equal to 10 degrees and more than or equal to 0 degree or less than or equal to 3 degrees and more than 0 degree;

the arc center on the head corner arc segment is arranged close to the outer side in the horizontal direction relative to the arc center below the head corner arc segment, the distance from the arc center below the head corner arc segment to the center connecting line of the head and tail wheels in the vertical direction is smaller than the distance from the arc center below the head corner arc segment to the center connecting line of the head and tail wheels, and the head middle arc is symmetrically arranged relative to the center connection of the head and tail wheels; the arc center on the tail corner arc section is arranged close to the outer side of the arc center below the tail corner arc section in the horizontal direction, the distance from the arc center to the connecting line of the centers of the head and tail wheels in the vertical direction is smaller than the distance from the arc center to the connecting line of the centers of the head and tail wheels below the head corner arc section, and the arc section in the middle of the tail circle is a circular arc section; the arc length of the arc above the connecting line of the centers of the head and tail wheels is longer than that of the arc below the connecting line;

the center of the shaft hole of the head wheel is concentric with the arc center of the middle arc section of the head curved rail, the center of the shaft hole of the tail wheel is concentric with the arc center of the middle arc section of the tail curved rail, the tooth pitches of the head wheel and the tail wheel are the same, the number of teeth of the head wheel is greater than that of the tail wheel, the difference of the number of teeth of the head wheel and the tail wheel is greater than or equal to 1, the tangent line on the pitch circles of the head wheel and the tail wheel is parallel to the upper straight rail, and the lower tangent line of the pitch circles of the head wheel and the tail wheel is parallel to the lower straight rail;

the pitch circle diameter of the head wheel is 2068.04mm, the pitch circle diameter of the tail wheel is 1827.7mm, and the number of teeth of the head wheel is

The utility model has the advantages that:

the method for smoothly running the trolley for the continuous casting machine adopts the utility model, because the trolley runs on the straight rail which is inclined downwards, the gravity of the trolley is decomposed into component forces in two directions, one component force is parallel to the straight rail and is consistent with the advancing direction of the trolley, and as the power of advancing, one component force forms friction resistance which is vertical to the straight rail and is opposite to the advancing direction of the trolley, compared with the friction resistance when the trolley runs on the horizontal straight rail, the power of advancing is increased, therefore, the running resistance of the trolley on the straight rail is reduced, the power of running under the condition of not increasing the driving force of a driving device is increased, the running of the trolley is smoother, the clamping stagnation can be effectively reduced, the energy is saved, because the trolley inclines forwards and has the trend of gliding, the jointing between the trolley molds is tighter and more reliable, the casting liquid can be prevented from leaking, when the trolley runs on the upper straight rail along the upper straight rail which is inclined downwards, because the upper straight rail has a certain downward gradient, the molten metal flows more smoothly during pouring, the uniformity distribution of the molten metal is facilitated, and the ingot mold is more uniform.

By adopting the trolley running mechanism of the casting machine of the utility model, at least one pair of straight rails in the upper straight rail and the lower straight rail is arranged along the running direction of the trolley in a downward inclination way, therefore, the gravity of the trolley running on the straight rails is decomposed into two component forces, one component force is along the running direction of the trolley, the other component force is vertical to the running direction of the trolley, the vertical component force is vertical to the straight rails to form friction resistance, therefore, the trolley running on the straight rails arranged in an inclined way is added with a forward power which is internal, the friction resistance is formed by the component force of the gravity, the friction resistance is reduced, the resistance borne by the trolley on the whole is reduced, the running of the trolley on the straight rails inclined in the forward running direction is smoother, the trolley all inclines towards the running direction during running can make the metal solution present a forward flowing trend, and prevent the metal solution from flowing backwards, the trolleys are inclined towards the running direction during running, so that the trolleys can be attached more tightly and reliably, and the molten metal is prevented from leaking out in the running process of the trolleys. The utility model discloses a structure can improve the operation power of platform truck under the condition that does not increase power take off, still can reduce the required power take off of platform truck operation, consequently can the energy saving.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a track for a trolley for a continuous casting machine according to the present invention;

FIG. 2 is a schematic structural view of the embodiment of the present invention after the track is provided with the trolley, the head wheel and the tail wheel;

fig. 3 is a schematic top view of fig. 1.

Description of reference numerals:

100-head bending rail; 101-head curved rail fixing frame; 102-upper straight rail section of head curved rail; 103-on the head corner arc segment; 104-middle arc section of head; 105-under the head corner arc segment; 106-lower straight rail section of head bend rail; 107- -connecting the straight rails; 108-arc center on head corner arc segment; 109-arc center under the arc segment of the head corner;

200-tail bending rail; 201-tail curved rail fixing frame; 202-upper straight rail section of tail curved rail; 203-on the tail corner arc segment; 204-tail middle arc section; 205-under the tail corner arc segment; 206-lower straight rail section of tail curved rail;

300-straight rail; 301-upper straight rail; 302-lower straight rail;

401-nose wheel pitch circle; 402-head wheel; 403-tail wheel; 404-trolley; 405-tangent line of pitch circle on head and tail wheel; 406-tangent line of lower pitch circle of head and tail wheel; 407-center connecting line of head and tail wheel

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

The utility model discloses a following method makes the smooth and easy operation of platform truck: the straight rail 300 is obliquely arranged from the head part of the casting machine to the tail part of the casting machine, so that the trolley 404 runs along the downhill on the oblique straight rail 300, the friction force between the trolley and the straight rail is reduced, the power for the trolley to move forwards is increased by the gravity of the trolley, the phenomenon that the trolley is blocked is improved on the premise of not increasing the driving force of a head wheel, the power output for the trolley to move forwards is reduced, the rear trolley and the front trolley are prevented from being extruded and arched, the running blockage is caused, and the trolley runs smoothly. The inclination angle of the straight rail is preferably less than or equal to 10 degrees and greater than 0 degree, so that the phenomenon of vehicle sliding caused by overlarge inclination angle is prevented, and the pressure of the tail wheel mechanism is increased. The method is most suitable for the continuous casting machine with larger center distance between head and tail wheel holes between the head wheel 402 and the tail wheel 403. Adopt the utility model discloses a method, because the platform truck moves ahead on the downward track of slope, its gravity is divided into the component force of two directions, one is perpendicular and the downward component force of horizontal plane, it produces frictional force, another is that forward component force produces forward power, consequently obtained the inherent power that moves ahead when making the frictional force between platform truck and track reduce, alright reduce the card pause that produces owing to frictional resistance under the drive power's of not increasing the head pulley, prevent that back car from taking place the jam and the arch camber that the extrusion produced with the front truck, make the platform truck move smoothly. And the trolley is positioned on the inclined track, so that the whole trolley is also inclined forwards, and the front trolley pushes the rear trolley to move forwards in the running process of the trolley, so that the trolley running on the straight track forms a whole with the head part from high to low to the tail part, and the metal liquid can not flow backwards. According to the specific situation, the upper straight rail 301 can be independently obliquely arranged and downwards inclined from the head part of the casting machine to the tail part of the casting machine, the trolley can prevent the casting liquid from flowing backwards when carrying the molten metal and forwards, and the lower straight rail 302 can also be independently obliquely arranged and downwards inclined from the tail part of the casting machine to the head part of the casting machine, so that the blockage caused by insufficient power of the trolley can be relieved.

The method of the invention can be implemented using a caster trolley running mechanism as shown in fig. 1 to 2. For convenience, the running mechanism of the casting machine trolley is referred to as a structure for smooth running of the trolley.

As shown in fig. 1, the structure of the embodiment of the present invention for smooth operation of the trolley includes a rail. The rail comprises an upper straight rail 301, a lower straight rail 302, a head bending rail 100 and a tail bending rail 200, wherein the head bending rail is connected with the head ends of the upper straight rail and the lower straight rail, the two ends of the head bending rail are respectively connected with the tail ends of the upper straight rail and the lower straight rail, and the two ends of the tail bending rail are respectively connected with the tail ends of the upper straight rail and the lower straight rail to form a circular running rail for the trolley to move forward. Wherein at least one straight rail of the upper straight rail and the lower straight rail is obliquely arranged to enable the trolley to move forwards on the track of the lower slope, when the upper straight rail is obliquely arranged, the head end of the upper straight rail is obliquely downwards inclined towards the tail end of the upper straight rail, when the lower straight rail is obliquely arranged, the tail end of the lower straight rail is obliquely downwards inclined towards the head end of the lower straight rail, so that the trolley is arranged on the track which is obliquely downwards inclined when moving forwards on the straight rail, in general, the trolley moves on the lower slope, thus, the self weight of the trolley is divided into two component forces, one component force is vertical to the straight rail and generates friction force with the straight rail, and the other component force is forward force to form power for pushing the trolley to move forwards, therefore, the oblique straight rail can reduce the friction force between the trolley and the straight rail and can reduce the power for moving forwards of the trolley, thereby not only saving the power output, but also reducing the resistance for moving forwards of the trolley, effectively prevent arching and pause that the platform truck stopped and led to the fact, prevent that the front truck from hindering the back plantago, can not make the platform workshop form the arch, make the smooth and easy continuous operation of platform truck on straight rail. When the upper straight rail and the lower straight rail are obliquely arranged, the inclination angles of the upper straight rail and the lower straight rail can be consistent or inconsistent, and when the upper straight rail and the lower straight rail are obliquely arranged, the trolley runs from the head to the tail and from the tail to the head, namely, runs on the whole straight rail and is positioned on the downward inclined rail, so that the power output for driving the trolley to move forwards can be further saved, and the blocking can be effectively reduced on all the straight rails. The inclination angle of the straight rail needs to be proper and cannot be too large, otherwise, the inclination angle of the die cavity is too large, molten metal overflows along the downward inclination direction of the straight rail in the casting process, the die cavity cannot be filled with the molten metal, or the molten metal overflows outwards from the die cavity along the inclination direction of the straight rail because the molten metal is not cooled in the process that the trolley moves forwards, therefore, the maximum inclination angle of the straight rail needs to ensure that the molten metal cannot overflow along the downward inclination direction of the straight rail when the molten metal is cast or after the die cavity is filled, and when the trolley moves on the straight rail before cooling. The inclination angle of the straight rail is generally 10 degrees or less and 0 degree or more. Preferably, the angle is less than or equal to 3 degrees and greater than 0 degree, so that the trolley can run more smoothly by combining the self weight of the trolley and the length of the track.

In order to ensure that the trolley can smoothly run on the track, the joints of the straight rails and the head bent rails and the tail bent rails are smoothly connected, namely the upper straight rails and the lower straight rails are smoothly connected with the head bent rails and the tail bent rails. Therefore, the head curved rail 100 and the tail curved rail 200 are preferably formed by combining a plurality of circular arcs and straight lines and are in a U shape, wherein the head curved rail comprises a head middle circular arc section 104, a head corner circular arc section upper 103, a head corner circular arc section lower 105, a head curved rail upper straight rail section 102 and a head curved rail lower straight rail section 106, the head corner circular arc section upper and the head corner circular arc section lower are respectively positioned at two sides of the head middle circular arc section and are tangentially connected with the head middle circular arc section through a connecting straight rail 107, the head corner circular arc section upper 103 is tangentially connected with the head end of the upper straight rail 301 through the head curved rail upper straight rail section 102, the head curved rail lower is tangentially connected with the head end of the lower straight rail through the head curved rail lower straight rail section, the head curved rail upper straight rail section and/or the head curved rail lower straight rail section are both obliquely arranged inwards, that is to say, the head curved rail upper straight rail section and/or the head curved rail lower straight rail section are both arranged towards the opening direction The tail curved rail is inclined towards the central line direction of the rail, wherein the tail curved rail comprises a tail middle circular arc section 204, a tail corner circular arc section upper 203, a tail corner circular arc section lower 205, a tail curved rail upper straight rail section 202 and a tail curved rail lower straight rail section 206, the upper part of the tail corner circular arc section and the lower part of the tail corner circular arc section are respectively positioned at two sides of the tail middle circular arc section and are tangentially connected with the tail middle circular arc section through straight rails, the tail corner circular arc section and the tail middle circular arc section are all inner circular arcs, the tail corner circular arc section is tangentially connected with the head end of the upper straight rail through the upper straight rail section of the tail curved rail, the tail corner circular arc section is tangentially connected with the head end of the lower straight rail through the lower part of the tail straight rail, the upper straight rail section of the tail curved rail and/or the lower straight rail section of the tail curved rail are inclined towards the inner side, namely the upper straight rail section of the tail curved rail and/or the lower straight rail section of the tail curved rail is inclined towards the tail opening direction towards the central line direction far away from the central line direction of the rail, the inclination angles of the upper straight rail section of the head bent rail and the upper straight rail section of the tail bent rail are consistent with the inclination angle of the upper straight rail and are respectively a1, and the inclination angles of the lower straight rail section of the head bent rail and the lower straight rail section of the tail bent rail are consistent with the inclination angle of the lower straight rail and are respectively a 2. The head curved rail and the tail curved rail are both formed by arranging an inner curved rail and an outer curved rail in parallel. In order to ensure that the trolley runs smoothly and quickly on the head curved rail and the tail curved rail, the arc center of the head middle arc section is superposed with the center of the shaft hole of the head wheel 402 and is symmetrically arranged about the central connecting line 407 of the head wheel and the tail wheel, the arc center 108 on the head corner arc section is positioned above the central connecting line of the head wheel and the tail wheel, the arc center 109 under the head corner arc section is positioned below the central connecting line of the head wheel and the tail wheel and is staggered in the horizontal direction, the arc center 108 on the head corner arc section is positioned outside in the horizontal direction, the arc center of the head corner arc section is positioned inside the arc center of the head corner arc section 109, the distance from the arc center on the head corner arc section to the head wheel central connecting line and the distance from the arc center under the head corner arc section to the central connecting line of the head wheel and the tail wheel are larger than the distance from the arc center under the head corner arc section to the central connecting line of the head wheel, the arc center of the tail wheel is superposed with the central hole center of the tail wheel, the arc center of the tail middle arc section is superposed with the tail wheel, the tail wheel central connecting line, and the length of the tail wheel above the central connecting line is larger than the central connecting line of the head wheel, the arc length of the arc above the central connecting line of the head and tail wheels is 1.5-2.5 times of the arc length of the arc below the connecting line, the arc radius on the arc section of the tail corner is larger than that of the arc below the arc section of the tail corner, the arc center on the arc section of the tail corner in the horizontal direction is close to the inner side, the arc center below the arc section of the tail corner in the horizontal direction is close to the outer side, the distance from the arc center on the arc section of the tail corner to the central connecting line of the head and tail wheels in the vertical direction is smaller than that from the arc center below the arc section of the tail corner to the central connecting line of the head and tail wheels, the head curved rail adopting the multi-section structure has the advantage that the tail curved rail adopting the multi-section structure can ensure that the trolley runs under the interaction of the clamping wheels and the star wheels, the trolley wheels can more smoothly pass along the head curved rail and the tail curved rail, and the continuous running of the casting trolley is prevented from being influenced by the clamping stagnation of the trolley.

The centers of the shaft holes of the head wheel and the tail wheel are arranged at the same height, namely the center connecting line of the holes of the head wheel and the tail wheel is horizontally arranged, the pitch circle diameter of the head wheel is larger than that of the tail wheel, the upper straight rail is parallel to the upper pitch circle tangent line of the head wheel and the tail wheel, and the lower straight rail is parallel to the lower pitch circle tangent line of the head wheel and the tail wheel.

Preferably, the inclination angles of the upper straight rail and the lower straight rail are the same, the modules of the head wheel and the tail wheel are the same, the number of teeth of the head wheel is greater than that of the tail wheel, and the difference between the number of teeth is at least 1 tooth. For example, the pitch circle diameter of the head wheel is 2068.04mm, the pitch circle diameter of the tail wheel is 1827.7mm, the number of teeth of the head wheel is 17 teeth, the number of teeth of the tail wheel is 15 teeth, the upper straight rail and the lower straight rail incline by 0.16 degrees respectively, and the inclination angles of the upper straight rail and the lower straight rail can be adjusted according to the center distance between the head wheel and the tail wheel. When in use, the head curved rail is fixedly arranged on the head curved rail fixing frame 101, and the tail curved rail is fixedly arranged on the tail curved rail fixing frame.

The method and the structure of the utility model are particularly suitable for the continuous casting machine which can make each trolley behind push the trolley in front to move forward by stirring the clamping shaft of each trolley through the head wheel.

Claims (8)

1. The trolley running mechanism of the casting machine comprises annular rails which are arranged in parallel in pairs and used for running of the trolley, wherein each annular rail comprises an upper straight rail, a lower straight rail, a head bent rail and a tail bent rail.

2. The caster trolley mechanism of claim 1, wherein the nose curved track and the tail curved track are both U-shaped, the nose curved track includes an upper straight track section, a head corner arc section upper, a head middle arc section, a head corner arc section lower, and a head curved track lower straight track section, which are sequentially arranged, the upper straight track section of the nose curved track is tangentially connected to an upper end of the head corner arc section, an upper end of the head middle arc section is connected to an upper end of the head corner arc section through a connecting straight track, a lower end of the head middle arc section is tangentially connected to an upper end of the head corner arc section lower, and a lower end of the head corner arc section is tangentially connected to a lower straight track section of the nose curved track; the tail curved rail comprises an upper straight rail section, an upper tail corner arc section, a middle tail arc section, a lower tail corner arc section and a lower straight rail section of the tail curved rail, which are sequentially arranged, wherein the upper straight rail section of the tail curved rail is in tangent connection with the upper end of the tail corner arc section, the upper end of the middle tail arc section is in tangent connection with the upper end of the tail corner arc section, the lower end of the middle tail arc section is in tangent connection with the lower straight rail section of the tail curved rail, the lower end of the tail corner arc section is in tangent connection with the lower straight rail section of the head curved rail, the upper straight rail section of the head curved rail is connected with the head end of the upper straight rail, the lower straight rail section of the head curved rail is connected with the head end of the lower straight rail, and the upper straight rail section of the tail curved rail is connected with the tail end of the upper straight rail, the lower straight rail section of the tail bent rail is connected with the tail end of the lower straight rail.

3. The trolley running mechanism for casting machines according to claim 2, wherein when the upper straight rail is inclined, the upper straight rail is inclined downward from the head curved rail toward the tail curved rail, the upper straight rail section of the head curved rail and the upper straight rail section of the tail curved rail are both inclined, and the inclination direction is the same as the inclination direction of the upper straight rail, and when the lower straight rail is inclined, the lower straight rail section of the head curved rail and the lower straight rail section of the tail curved rail are both inclined downward from the tail curved rail toward the head curved rail, and the inclination direction is the same as the inclination direction of the lower straight rail.

4. The caster trolley mechanism of claim 3 wherein the upper and lower straight rails are inclined.

5. The caster trolley mechanism of claim 1 wherein the angle of inclination of each of the upper and lower straight rails is 10 degrees or less and 0 degrees or more or 3 degrees or less and 0 degrees or more.

6. The caster trolley running mechanism of claim 1, wherein the arc center of the head corner arc segment is disposed horizontally outward relative to the arc center of the head corner arc segment, the distance from the vertical line to the center of the head-tail wheel is smaller than the distance from the arc center of the head corner arc segment to the center of the head-tail wheel, and the head middle arc is symmetrically disposed relative to the center of the head-tail wheel; the arc center on the tail corner arc section is arranged close to the outer side in the horizontal direction relative to the arc center below the tail corner arc section, the distance from the arc center to the center connecting line of the head and tail wheels in the vertical direction is smaller than the distance from the arc center to the center connecting line of the head and tail wheels below the head corner arc section, the arc above the center connecting line of the head and tail wheels is larger than the arc length of the arc below the head and tail wheels.

7. The trolley running mechanism for casting machines according to claim 2, wherein the center of the shaft hole of the head wheel is concentric with the arc center of the middle arc segment of the head curved rail, the center of the shaft hole of the tail wheel is concentric with the arc center of the middle arc segment of the tail curved rail, the pitch of the head wheel and the tail wheel is the same, the number of teeth of the head wheel is greater than that of the tail wheel, the difference between the number of teeth of the head wheel and the number of teeth of the tail wheel is greater than or equal to 1, the tangent line on the pitch circles of the head wheel and the tail wheel is parallel to the upper straight rail, and the tangent line on the pitch circles of the head wheel and the tail wheel is parallel to the lower straight rail.

8. The caster trolley operating mechanism of claim 2 wherein the nose wheel has a pitch diameter of 2068.04mm, the tail wheel has a pitch diameter of 1827.7mm, the nose wheel has 17 teeth, the tail wheel has 15 teeth, and the upper and lower straight rails are each inclined at 0.16 degrees.

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