Precision casting shell making machine

Abstract

The present application relates to the technical field of casting, in particular to a precision casting shell making machine, comprising a hoisting part. The hoisting part comprises a driving part and a hoisting mechanism, the hoisting mechanism is installed on the driving part, the hoisting mechanism comprises a shell, a basket, an induction assembly and two lifting rods. The two lifting rods are eccentrically arranged on the shell and can rotate with the shell. The basket comprises a main rod and two lifting arms, the main rod is connected with a fused mold; the lifting arms are connected with the hooks on the corresponding lifting rods. The induction assembly is installed on the shell. The precision casting shell making machine monitors the axial relative displacement of the lifting rods through the induction assembly, feeds back the eccentricity of the fused mold, and after casting the same batch of workpieces for multiple times, realizes position exchange through the rotation of the lifting rods and the shell, re-matches the high-wear-side lifting rod with the low-wear-side lifting arm, balances the wear degree of both sides, and prolongs the service life of the whole hoisting part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a precision casting shell making machine. BACKGROUND

[0002] Precision casting is the core process of obtaining high-precision and high-surface-finish castings. Compared with traditional sand casting, precision casting has smaller size error and better surface quality, and is widely used in fields such as aerospace, automobile manufacturing and precision instruments that require high precision of parts.

[0003] Precision casting includes various processes such as investment casting, ceramic mold casting and metal mold casting. Among them, investment casting (also known as lost wax casting) is one of the most widely used processes because it is suitable for complex structure castings and has high precision. The core process is as follows: a wax or other material is used to make a melting mold; a refractory coating is repeatedly applied on the surface of the melting mold, and refractory sand is scattered, and a mold shell is formed after hardening and drying; the internal melting mold is removed to form a mold cavity; the mold shell is baked to improve its strength and remove residual melting mold material; metal liquid is poured; after the metal liquid solidifies and cools, the shell is removed and the sand is cleaned to obtain the finished product, and if necessary, heat treatment, cold working or surface treatment is required.

[0004] In the shell making process of investment casting, the shell making machine is a key equipment for automatic coating and sanding. It drives the hanging basket loaded with wax mold group by a mechanical hand, completes the processes of refractory coating and refractory sand scattering according to the preset program, and greatly improves the shell making efficiency and consistency. However, during the operation of the existing shell making machine, the eccentricity of the melting mold mass will cause unavoidable relative movement at the connection part of the mechanical hand and the wax mold group hanging basket, and this relative movement will cause continuous wear at the connection part, which not only shortens the service life of the hanging basket and affects the stable use of the hanging basket, but also increases the scrap rate of shell making. SUMMARY

[0005] The present application provides a precision casting shell making machine to solve the problem that the existing precision casting shell making machine has relative movement at the connection part of the mechanical hand and the wax mold group hanging basket during use, which causes continuous wear at the connection part, affects the stable use of the hanging basket, and increases the scrap rate of shell making.

[0006] The application discloses a precision casting shell making machine which adopts the following technical scheme: a precision casting shell making machine comprises a hoisting part, a coating part and a sanding part; the hoisting part comprises a driving member and a hoisting mechanism, the hoisting mechanism is installed on the driving member, and the hoisting mechanism comprises a shell, a basket, a sensing assembly and two lifting rods; the shell is column-shaped, the shell is installed on the driving member, and the driving member is used for driving the shell to rotate about its own axis; the two lifting rods are eccentrically arranged on the shell and can rotate with the shell, the axis of the lifting rod is parallel to the axis of the shell, and the two lifting rods are symmetrically arranged about the central axis of the shell in the initial state; the lifting rod can move along the axis direction of the shell and can rotate about its own axis relative to the shell; the basket comprises a main rod and two lifting arms, the main rod is coaxially arranged with the shell, and a molten mold is connected to the main rod; the axis of the lifting arm is perpendicular to the axis of the main rod, and the two lifting arms are coaxially arranged and are both installed on the main rod; the lifting arm is arranged in one-to-one correspondence with the lifting rod, a lifting hook is arranged on the lifting rod, and the lifting arm is connected with the lifting hook on the lifting rod corresponding thereto; the sensing assembly is installed on the shell, relative movement of the two lifting rods in the axis direction thereof can drive the sensing assembly to act, and the sensing assembly is used for monitoring the relative displacement amount of the two lifting rods in the axis direction thereof; the coating part is used for coating the molten mold with refractory coating; and the sanding part is used for sanding the molten mold after coating with refractory sand.

[0007] Further, two first hydraulic cylinders are arranged in the shell, the first hydraulic cylinders are arranged in one-to-one correspondence with the lifting rods, the lifting rods are arranged at the output ends of the first hydraulic cylinders and extend out of the shell along the axis direction thereof, and the lifting rod can rotate relative to the first hydraulic cylinder and can synchronously move with the output end of the first hydraulic cylinder.

[0008] Further, the sensing assembly comprises a sensing hydraulic cylinder, the sensing hydraulic cylinder is installed in the shell, the sensing hydraulic cylinder comprises a first cylinder body and a sensing plate, the sensing plate is installed in the first cylinder body and is in sliding sealing with the first cylinder body, the sensing plate divides the first cylinder body into a first chamber and a second chamber, and the first chamber and the second chamber are both filled with hydraulic oil; the first hydraulic cylinder comprises a second cylinder body and a piston rod, the piston rod is in sliding sealing with the second cylinder body, and the first chamber and the second chamber are in communication with the chambers in which the piston rods of the two first hydraulic cylinders are located, respectively; a position sensor is arranged in the first chamber or the second chamber, the position sensor can monitor the position of the sensing plate and convert the position into an available output signal to be transmitted to an externally connected control system.

[0009] Further, the lifting rod is connected with the output end of the first hydraulic cylinder through a rotating column, the rotating column is coaxially arranged with the lifting rod, an annular protrusion is coaxially and fixedly arranged on the outer peripheral wall surface of the rotating column, and the output end of the first hydraulic cylinder is provided with an annular groove for rotating cooperation with the annular protrusion.

[0010] Further, the first hydraulic cylinder comprises a second cylinder body and a piston rod, the piston rod comprises a plate part and a rod part fixedly connected with the plate part, the plate part is in sliding sealing with the second cylinder body, the plate part separates the second cylinder body into two independent chambers, the two chambers are filled with hydraulic oil, the rod part penetrates one of the two chambers and extends out of the second cylinder body, and the chamber in which the rod part is located is referred to as an adjusting chamber.

[0011] Further, the first cylinder body is provided with a first communication port and a second communication port for communicating with the first chamber, and the first cylinder body is also provided with a third communication port and a fourth communication port for communicating with the second chamber; the adjusting chambers of the two first hydraulic cylinders are respectively communicated with the first communication port and the third communication port, and the second communication port and the fourth communication port are respectively connected with external oil lines.

[0012] Further, the hoisting mechanism further comprises a top rod, the top rod is installed on the shell and coaxial with the shell, the top rod can move along the axial direction of the shell and can rotate synchronously with the shell, the top rod is located on the side of the main rod close to the shell in the axial direction of the shell, two abutting balls are arranged on the end of the top rod close to the main rod in the axial direction of the top rod, and an abutting surface for abutting with the abutting balls is arranged on the main rod, and the abutting surface is an inclined surface.

[0013] Further, a second hydraulic cylinder is arranged in the shell, and the top rod is arranged at the output end of the second hydraulic cylinder and extends out of the shell in the axial direction of the top rod.

[0014] Further, the hoisting mechanism further comprises a transmission member, the transmission member is used for driving the two lifting rods to rotate around their own axes.

[0015] Further, the driving member is a mechanical arm.

[0016] The beneficial effects of the present application are: the precision casting shell forming machine of the present application is provided with a hoisting part, a coating part and a sanding part, which cooperate during casting, the axial relative displacement of the lifting rod is monitored by the sensing assembly, the eccentricity of the investment mold is fed back, and after casting the same batch of workpieces for multiple times, the position exchange is realized through the self-rotation of the lifting rod and the shell, the high-wear side lifting rod and the low-wear side lifting arm can be matched again, the wear degree of the two sides is balanced, the single lifting rod is prevented from being scrapped in advance due to excessive wear, and the service life of the whole hoisting part is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 A schematic diagram of the overall structure of an embodiment of a precision casting shell making machine of the present invention;

[0019] Figure 2 A state diagram of the lifting portion of an embodiment of a precision casting shell making machine of the present invention after lifting a mold;

[0020] Figure 3 A state diagram of the lifting mechanism of an embodiment of a precision casting shell making machine of the present invention before lifting a mold;

[0021] Figure 4 A state diagram of the lifting mechanism of an embodiment of a precision casting shell making machine of the present invention after lifting a mold;

[0022] Figure 5 A schematic diagram of the partial structure of an embodiment of a precision casting shell making machine of the present invention;

[0023] Figure 6 A Figure 5 Enlarged view of A in the middle;

[0024] Figure 7 A Figure 5 Enlarged view of B in the middle;

[0025] Figure 8 A sectional view of the partial structure of an embodiment of a precision casting shell making machine of the present invention;

[0026] Figure 9 A sectional view of the induction hydraulic cylinder of an embodiment of a precision casting shell making machine of the present invention;

[0027] Figure 10 A state diagram of the lifting mechanism of an embodiment of a precision casting shell making machine of the present invention after lifting a mold with a hole;

[0028] Figure 11 A state diagram of the lifting mechanism of an embodiment of a precision casting shell making machine of the present invention after lifting a mold with a hole, with the basket deflected.

[0029] In the figure: 100, hoisting part; 110, driving piece; 120, shell; 130, basket; 131, main rod; 132, hoisting arm; 133, hoisting block; 140, hoisting rod; 141, hoisting hook; 142, rotating column; 150, first hydraulic cylinder; 151, second cylinder body; 152, piston rod; 160, inductive hydraulic cylinder; 161, first cylinder body; 162, inductive plate; 163, first chamber; 164, second chamber; 165, first communication port; 166, second communication port; 167, third communication port; 168, fourth communication port; 169, partition plate; 170, top rod; 171, abutting ball; 180, second hydraulic cylinder; 190, transmission piece; 191, motor; 192, main gear; 193, driven gear; 200, coating part; 300, sanding part; 400, investment mold. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] An embodiment of the precision casting shell forming machine of the present application is shown in Figures 1 to 11

[0032] ​A precision casting shell-making machine includes a lifting section 100, a coating section 200, and a sand-spreading section 300. The lifting section 100 includes a drive member 110 and a lifting mechanism mounted on the drive member 110. The lifting mechanism includes a shell 120, a basket 130, a sensing component, and two lifting rods 140. The shell 120 is cylindrical and mounted on the drive member 110, which drives the shell 120 to rotate about its own axis. The two lifting rods 140 are eccentrically arranged on the shell 120 and can rotate with the shell 120. The axes of the lifting rods 140 are parallel to the axis of the shell 120. Initially, the two lifting rods 140 are symmetrically arranged about the central axis of the shell 120. The lifting rods 140 can move relative to the shell 120 along their axial direction and can rotate relative to the shell 120 about their own axis. The suspended platform 130 includes a main rod 131 and two booms 132. The main rod 131 is coaxially arranged with the housing 120, and a casting mold 400 is connected to the main rod 131 via a lifting block 133. The axis of the boom 132 is perpendicular to the axis of the main rod 131. The two booms 132 are coaxially arranged and fixedly installed on the main rod 131, making the suspended platform 130 have a cross-shaped structure. Each boom 132 corresponds to a lifting rod 140, and each lifting rod 140 is equipped with a hook 141. The boom 132 is connected to the hook 141 on its corresponding lifting rod 140. A sensing component is installed on the housing 120. Relative movement of the two lifting rods 140 along their axial direction triggers the sensing component to operate. The sensing component monitors the relative displacement of the two lifting rods 140 along their axial direction. A coating section 200 is used to coat the casting mold 400 installed on the main rod 131 with a refractory coating. The sand-spreading section 300 is used to spread refractory sand onto the coated investment mold 400. Both the coating section 200 and the sand-spreading section 300 are prior art and will not be described in detail here.

[0033] Furthermore, the drive component 110 is a robotic arm. In use, the robotic arm controls the housing 120 to rotate around its own axis.

[0034] In this embodiment, by setting up a lifting section 100, a coating section 200, and a sand-spraying section 300 in coordination, during casting, the investment mold 400 is first installed on the main rod 131 of the lifting basket 130, and then the lifting arm 132 is lifted using the hook 141. See [link to documentation]. Figure 3 As shown, at this time, the boom 140 and the jib 132 are perpendicular to each other.

[0035] Then, the drive unit 110 controls the housing 120 to rotate the boom 140, causing the hook 141 to rotate 90° relative to the boom 132. Then, the drive unit 110 controls the housing 120 again, causing the boom 140 and the basket 130 to rise, completing the hoisting of the investment mold 400. (See below) Figure 4 As shown.

[0036] If the mold 400 is not eccentric, the boom 132 and the jib 140 are in a balanced state, neither the jib 140 nor the boom 132 moves, and the sensing assembly does not act. If the mold 400 is eccentric, the mold 400 exerts inconsistent forces on the corresponding jib 140 through the boom 132, the jib 140 and the boom 132 will be unbalanced, the two jibs 140 will produce relative displacement in the axial direction, at this time the sensing assembly is started, and the relative displacement of the two jibs 140 in the axial direction is monitored by the sensing assembly. Subsequently, the basket 130 and the mold 400 are transferred to the coating part 200, the shell 120 is driven by the driving member 110 to rotate around its own axis, and the refractory coating is coated; then the mold 400 is transferred to the sanding part 300, and the coated mold 400 is coated with refractory sand, and the coating and sanding process is repeated until the shell is prepared.

[0037] Moreover, the unbalance of the jib 140 and the boom 132 will cause the wear between the two jibs 140 and the corresponding booms 132 to be inconsistent. That is, after one casting, the wear on the heavier side is greater than that on the lighter side. For the convenience of description, the two jibs 140 are respectively referred to as a first rod and a second rod, and the two booms 132 are respectively referred to as a first arm and a second arm, and in the initial state, the first rod is connected with the first arm, and the second rod is connected with the second arm. If the first rod moves relative to the second rod after connecting the mold 400, it can be considered that the first rod side is heavier, the second rod side is lighter, and the wear between the first rod and the first arm is relatively greater.

[0038] When casting the same batch of workpieces, after casting for a period of time, the basket 130 is first disassembled, then the two jibs 140 are respectively driven to rotate 180°, the hooks 141 of the first rod and the second rod are made to face away from the boom 132, and the first rod and the second rod are driven by the driving member 110 to revolve 180°, so that the first rod and the second rod are exchanged in position, and the positions of the two booms 132 remain unchanged. When used next time, the first rod will be connected with the second arm, and the second rod will be connected with the first arm, so that if the wear between the first rod and the first arm is greater in the initial state, the wear between the second rod and the first arm will be greater after exchange. The high-wear-side jib 140 is re-matched with the low-wear-side boom 132, the wear degree of both sides is balanced, and the service life of the entire lifting part 100 is prolonged.

[0039] In a further embodiment, two first hydraulic cylinders 150 are arranged in the shell 120, the first hydraulic cylinders 150 are arranged one-to-one corresponding to the jibs 140, and the jibs 140 are arranged at the output ends of the first hydraulic cylinders 150 and extend out of the shell 120 along the axial direction thereof. The jib 140 can rotate relative to the first hydraulic cylinder 150 and can move synchronously with the output end of the first hydraulic cylinder 150.

[0040] In a further embodiment, the sensing assembly comprises a sensing hydraulic cylinder 160 mounted in the housing 120, the sensing hydraulic cylinder 160 comprising a first cylinder body 161 and a sensing plate 162 mounted in the first cylinder body 161 and slidingly sealed with the first cylinder body 161, the sensing plate 162 separating the first cylinder body 161 into a first chamber 163 and a second chamber 164, both the first chamber 163 and the second chamber 164 being filled with hydraulic oil. The first hydraulic cylinder 150 comprises a second cylinder body 151 and a piston rod 152 slidingly sealed with the second cylinder body 151. The first chamber 163 and the second chamber 164 are respectively communicated with the chambers in which the piston rod 152 of the two first hydraulic cylinders 150 is located. A position sensor is arranged in the first chamber 163 or the second chamber 164, the position sensor being capable of monitoring the position of the sensing plate 162 and converting into an available output signal transmitted to an externally connected control system.

[0041] The boom 140 is connected with the output end of the first hydraulic cylinder 150 through a rotating column 142, the rotating column 142 is coaxially arranged with the boom 140, an annular protrusion is coaxially and fixedly arranged on the outer peripheral wall surface of the rotating column 142, and the output end of the first hydraulic cylinder 150 is provided with an annular groove for rotating cooperation with the annular protrusion. The rotating column 142 is connected with the boom 140 through a pin shaft.

[0042] Specifically, the piston rod 152 comprises a plate part and a rod part fixedly connected with the plate part, the plate part is slidingly sealed with the second cylinder body 151, the plate part separates the second cylinder body 151 into two independent chambers, both the chambers are filled with hydraulic oil. The rod part penetrates through one of the chambers and extends out of the second cylinder body 151, the chamber in which the rod part is located is called an adjusting chamber, the first chamber 163 and the second chamber 164 are respectively communicated with the adjusting chambers arranged correspondingly.

[0043] In use, when the mold 400 itself has eccentricity, the two hangers 140 are relatively displaced in the axial direction thereof, and the hanger 140 on the heavier side pulls the piston rod 152 of the first hydraulic cylinder 150 corresponding thereto, and the hydraulic oil in the adjusting chamber of the first hydraulic cylinder 150 is extruded into the first chamber 163 or the second chamber 164. Assuming that the hydraulic oil is extruded into the first chamber 163, the volume of the hydraulic oil in the first chamber 163 increases, and the inductive plate 162 is driven to move, and the hydraulic oil in the second chamber 164 is extruded into the adjusting chamber of the first hydraulic cylinder 150 corresponding to the hanger 140 on the lighter side, so that the two hangers 132 are adjusted to be inclined, that is, the hanger basket 130 drives the mold 400 to be deflected. At this time, the position sensor monitors the position of the inductive plate 162 and transmits it to the control system, and the position of the inductive plate 162 is recorded by the control system, so that it can be judged which side of the hanger 140 has a larger displacement according to the direction of movement of the inductive plate 162, and which side of the mold 400 has a larger eccentricity when casting the same batch of workpieces can be obtained. After casting several times, the position exchange is realized by the self-rotation of the hanger 140 and the shell 120, and the hanger 140 on the high-wear side is matched with the hanger 132 on the low-wear side again, so that the wear degree of the two sides is balanced.

[0044] In a further embodiment, the hoisting mechanism further comprises a top rod 170, which is coaxially arranged on the shell 120 and can move along the axial direction of the shell 120 and rotate synchronously with the shell 120. The top rod 170 is located on the side of the main rod 131 close to the shell 120 in the axial direction of the shell 120, and two abutting balls 171 are arranged on the end of the top rod 170 close to the main rod 131 in the axial direction thereof. The main rod 131 is provided with an abutting surface for abutting with the abutting balls 171, and the abutting surface is an inclined surface.

[0045] The second hydraulic cylinder 180 is arranged in the shell 120, and the top rod 170 is arranged on the output end of the second hydraulic cylinder 180 and extends out of the shell 120 in the axial direction thereof, and the top rod 170 is arranged on the output end of the second hydraulic cylinder 180 through the rotating column 142.

[0046] In this embodiment, the top rod 170 is arranged, and after the hanger 140 lifts the hanger arm 132, the second hydraulic cylinder 180 is started to drive the top rod 170 to move to the side close to the main rod 131 in the axial direction thereof, so that the abutting balls 171 can abut against the abutting surface, and then the abutting surface applies pressure to the main rod 131, so that the hanger arm 132 can be pressed against the hanger 140 and locked.

[0047] In a further embodiment, the hoisting mechanism further comprises a transmission member 190 for driving the two hangers 140 to rotate around their own axes, respectively.

[0048] The transmission member 190 comprises a motor 191, a main gear 192 and two driven gears 193. The motor 191 is fixedly installed in the housing 120, the main gear 192 is installed on the output shaft of the motor 191, and the driven gears 193 are coaxially arranged with the corresponding hoisting rods 140 and are in key groove cooperation with the corresponding hoisting rods 140, so that the hoisting rods 140 can move relative to the corresponding driven gears 193 and the hoisting rods 140 can rotate synchronously with the corresponding driven gears 193. The two driven gears 193 are in mesh with the main gear 192.

[0049] When it is required to rotate the two hoisting rods 140 around their own axes, the basket 130 is first disassembled, and then the motor 191 is started. The rotation of the main gear 192 driven by the motor 191 will drive the rotation of the driven gears 193 in mesh with the main gear 192, and the rotation of the driven gears 193 will drive the rotation of the corresponding hoisting rods 140.

[0050] In a further embodiment, the first cylinder body 161 is provided with a first communication port 165 and a second communication port 166 for communicating with the first chamber 163. The first cylinder body 161 is also provided with a third communication port 167 and a fourth communication port 168 for communicating with the second chamber 164. The adjusting chambers of the two first hydraulic cylinders 150 are respectively in communication with the first communication port 165 and the third communication port 167, and the second communication port 166 and the fourth communication port 168 are respectively connected with external oil lines. The first communication port 165 and the third communication port 167 are coaxially arranged, and the second communication port 166 and the fourth communication port 168 are coaxially arranged.

[0051] The induction plate 162 is in H-shaped structure. The first cylinder body 161 is provided with two partitions 169, one of which is used to separate the first chamber 163 so that the first communication port 165 and the second communication port 166 are not in communication with each other, and the other is used to separate the second chamber 164 so that the third communication port 167 and the fourth communication port 168 are not in communication with each other.

[0052] In the casting of the pipe-shaped investment casting mold 400 shown in Figure 2 When the pipe-shaped investment casting mold 400 shown in Figure 2When the pipe-shaped mold 400 shown in FIG. 1 has eccentricity, if the two hangers 140 are relatively moved along the axial direction, the hydraulic oil in the adjusting chamber of one of the first hydraulic cylinders 150 will be squeezed into the first chamber 163 through the first communication port 165, which will cause the inductive plate 162 to move, and the movement of the inductive plate 162 will cause the second communication port 166 to be passively sucked by the external oil circuit. Moreover, the movement of the inductive plate 162 will cause the oil in the second chamber 164 to be squeezed out through the third communication port 167 and the fourth communication port 168, and the oil squeezed out through the third communication port 167 will return to the adjusting chamber of the other first hydraulic cylinder 150, and the oil squeezed out through the fourth communication port 168 will enter the external oil circuit connected thereto.

[0053] If Figure 2 When the pipe-shaped mold 400 shown in FIG. 1 has a large size in the horizontal direction, when the mechanical arm drives the whole lifting mechanism to rotate, the linear speed of the portion close to the rotation axis is smaller than that of the portion far from the rotation axis, which will cause poor uniformity of the coating of the whole mold 400. When the mold 400 has eccentricity and the two hangers 140 are relatively moved along the axial direction, the hanger basket 130 will drive the mold 400 on it to deflect to a certain extent, which will enable the linear speed of the portion close to the rotation axis to be increased when the mechanical arm drives the whole lifting mechanism and the mold 400 to rotate, and the adverse effect of the large difference in linear speed on the coating will be weakened.

[0054] At this time, the hydraulic oil can also be introduced into the third communication port 167 or the fourth communication port 168 through the external pipeline to actively control the sliding of the inductive plate 162, and the inductive plate 162 and the two first hydraulic cylinders 150 are cooperated to reversely drive the two hangers 140 to relatively move along the axial direction, increase the relative displacement of the two hangers 140, and further reduce the adverse effect of the linear speed of the portion close to the rotation axis being smaller than that of the portion far from the rotation axis on the coating of the mold 400.

[0055] Alternatively, when the mold 400 shown in FIG. 2 is cast, if the mold 400 has eccentricity, the adjustment will also be performed according to the above process during lifting. Figure 10 When the mold 400 shown in FIG. 2 is cast, if the mold 400 has eccentricity, the adjustment will also be performed according to the above process during lifting. Moreover, since it is difficult for the refractory coating to enter the deep position of the hole during normal coating of the hole-shaped valve body-shaped mold 400, the uniformity of the coating is poor. Therefore, during use, the hydraulic oil can be introduced into the third communication port 167 or the fourth communication port 168 through the external pipeline to actively control the sliding of the inductive plate 162, and the inductive plate 162 and the two first hydraulic cylinders 150 are cooperated to reversely drive the two hangers 140 to relatively move along the axial direction, increase the relative displacement of the two hangers 140, and actively deflect the whole hanger basket 130 and the hole-shaped valve body-shaped mold 400, so that the inclination of the hole of the hole-shaped valve body-shaped mold 400 is increased.Figure 11 As shown, when the mechanical arm drives the whole lifting mechanism and the hole valve body-shaped investment casting mold 400 to rotate, the hole valve body-shaped investment casting mold 400 will revolve around the axis of the shell 120 along a circular trajectory, improving the speed of the refractory coating passing through the surface of the hole valve body-shaped investment casting mold 400, increasing the coating probability of the refractory coating and the hole of the hole valve body-shaped investment casting mold 400, and further improving the uniformity of coating. After the whole hanging basket 130 and the investment casting mold 400 are deflected in one direction and coated, hydraulic oil can be introduced into the third communication port 167 or the fourth communication port 168 through the external pipeline again, so that the whole hanging basket 130 and the hole valve body-shaped investment casting mold 400 are deflected in the other direction and coated again, so that the refractory material can fully contact both ends of the hole valve body-shaped investment casting mold 400, further improving the uniformity of coating and the forming quality of the hole valve body-shaped investment casting mold 400.

[0056] In combination with the above embodiment, the specific working process is as follows:

[0057] During casting, the investment casting mold 400 is first installed on the main rod 131 of the hanging basket 130, and then the mechanical hand is operated to lift the lifting arm 132 by the lifting hook 141, as shown in Figure 3 At this time, the lifting rod 140 and the lifting arm 132 are perpendicular to each other.

[0058] Then, the mechanical hand controls the shell 120 to drive the lifting rod 140 to rotate, so that the lifting hook 141 rotates 90° relative to the lifting arm 132, and then the mechanical hand controls the shell 120 to drive the lifting rod 140 and the hanging basket 130 to rise, completing the hoisting of the investment casting mold 400, as shown in Figure 4 .

[0059] After lifting the lifting arm 132 by the lifting rod 140, the second hydraulic cylinder 180 is started to drive the top rod 170 to move along its axis direction to the side close to the main rod 131, so that the abutting ball 171 can abut against the abutting surface, and then the abutting surface applies pressure to the main rod 131, so that the lifting arm 132 can be pressed with the lifting rod 140, and the locking is maintained.

[0060] If the mold 400 is not eccentric, the boom 132 and the rod 140 are in a balanced state, neither the boom 132 nor the rod 140 moves, and the sensing component does not operate. When the mold 400 is eccentric, causing relative displacement of the two rods 140 along their axial direction, the heavier rod 140 will pull the piston rod 152 of the corresponding first hydraulic cylinder 150, squeezing the hydraulic oil in the adjustment chamber corresponding to the first hydraulic cylinder 150 into the first chamber 163 or the second chamber 164. Assuming the hydraulic oil is squeezed into the first chamber 163, the volume of the hydraulic oil in the first chamber 163 increases, causing the sensing plate 162 to move, squeezing the hydraulic oil in the second chamber 164 into the adjustment chamber of the first hydraulic cylinder 150 corresponding to the lighter rod 140, thereby causing the two booms 132 to tilt after adjustment, that is, the basket 130 drives the mold 400 on it to deflect. At this time, the position sensor will monitor the position of the sensing plate 162 and transmit it to the control system. The control system records the position of the sensing plate 162, so that it can determine which side of the lifting rod 140 has a larger displacement based on the direction of movement of the sensing plate 162. In this way, it can be determined which side of the investment mold 400 has a larger eccentricity when casting the same batch of workpieces.

[0061] For ease of explanation, the two booms 140 are referred to as the first boom and the second boom, and the two arms 132 are referred to as the first arm and the second arm, respectively. In the initial state, the first boom is connected to the first arm, and the second boom is connected to the second arm. If the first boom moves relative to the second boom after the casting mold 400 is connected, it can be assumed that the first boom side is heavier and the second boom side is lighter, resulting in greater wear between the first boom and the first arm. After several castings, the basket 130 is first disassembled, and then the two booms 140 are driven to rotate 180°, so that the hooks 141 of the first boom and the hooks 141 of the second boom face away from the boom 132. Then, the drive unit 110 drives the first boom and the second boom to rotate 180°, so that the first boom and the second boom exchange positions, while the positions of the two booms 132 remain unchanged. In the next use, the first boom will be connected to the second boom, and the second boom will be connected to the first boom. This way, if the wear between the first boom and the first boom is greater in the initial state, after the exchange, the wear between the second boom and the first boom will be greater. The boom 140 with the high wear side is rematched with the boom 132 with the low wear side, balancing the wear on both sides and extending the service life of the entire lifting part 100.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision investment shell forming machine characterized by: The device comprises a lifting part (100), a coating part (200) and a sanding part (300); the lifting part (100) comprises a driving member (110) and a lifting mechanism, the lifting mechanism is installed on the driving member (110), and the lifting mechanism comprises a shell (120), a basket (130), a sensing assembly and two lifting rods (140); the shell (120) is column-shaped, the shell (120) is installed on the driving member (110), and the driving member (110) is used for driving the shell (120) to rotate about its own axis; the two lifting rods (140) are eccentrically arranged on the shell (120) and can rotate with the shell (120), the axis of the lifting rod (140) is parallel to the axis of the shell (120), and the two lifting rods (140) are symmetrically arranged about the central axis of the shell (120) in an initial state; the lifting rod (140) can move along the axis direction of the shell (120) and rotate about its own axis relative to the shell (120); the basket (130) comprises a main rod (131) and two lifting arms (132), the main rod (131) is coaxially arranged with the shell (120), and a mold (400) is connected to the main rod (131); the axis of the lifting arm (132) is perpendicular to the axis of the main rod (131), the two lifting arms (132) are coaxially arranged and are both installed on the main rod (131); the lifting arm (132) is correspondingly arranged with the lifting rod (140), a lifting hook (141) is arranged on the lifting rod (140), and the lifting arm (132) is connected with the lifting hook (141) on the lifting rod (140) corresponding thereto; the sensing assembly is installed on the shell (120), relative movement of the two lifting rods (140) in the axis direction thereof can drive the sensing assembly to act, and the sensing assembly is used for monitoring the relative displacement amount of the two lifting rods (140) in the axis direction thereof; the coating part (200) is used for coating the mold (400) with refractory coating; the sanding part (300) is used for sanding the coated mold (400) with refractory sand; two first hydraulic cylinders (150) are arranged in the shell (120), the first hydraulic cylinder (150) is correspondingly arranged with the lifting rod (140), the lifting rod (140) is arranged at the output end of the first hydraulic cylinder (150) and extends out of the shell (120) in the axis direction thereof; the lifting rod (140) can rotate relative to the first hydraulic cylinder (150) and can synchronously move with the output end of the first hydraulic cylinder (150); the sensing assembly comprises a sensing hydraulic cylinder (160), the sensing hydraulic cylinder (160) is installed in the shell (120), the sensing hydraulic cylinder (160) comprises a first cylinder body (161) and a sensing plate (162), the sensing plate (162) is installed in the first cylinder body (161) and is in sliding sealing with the first cylinder body (161), the sensing plate (162) divides the first cylinder body (161) into a first chamber (163) and a second chamber (164), and the first chamber (163) and the second chamber (164) are both filled with hydraulic oil.The first hydraulic cylinder (150) comprises a second cylinder body (151) and a piston rod (152), the piston rod (152) is in sliding sealing with the second cylinder body (151), and a first chamber (163) and a second chamber (164) are respectively communicated with chambers in which the piston rods (152) of the two first hydraulic cylinders (150) are located; a position sensor is arranged in the first chamber (163) or the second chamber (164), the position sensor can monitor the position of a sensing plate (162) and convert the position into an available output signal transmitted to an externally connected control system.

2. A precision investment shell forming machine according to claim 1 wherein: The boom (140) is connected with the output end of the first hydraulic cylinder (150) through a rotating column (142), the rotating column (142) is coaxially arranged with the boom (140), and an annular protrusion is coaxially and fixedly arranged on the outer peripheral wall surface of the rotating column (142), and the output end of the first hydraulic cylinder (150) is provided with an annular groove for rotating cooperation with the annular protrusion.

3. A precision shell making machine as claimed in claim 1 wherein: The piston rod (152) comprises a plate portion and a rod portion fixedly connected with the plate portion, the plate portion is in sliding sealing with the second cylinder body (151), the plate portion divides the second cylinder body (151) into two independent chambers, the two chambers are filled with hydraulic oil, the rod portion penetrates through one of the chambers and extends out of the second cylinder body (151), the chamber in which the rod portion is located is referred to as an adjusting chamber, and the first chamber (163) and the second chamber (164) are respectively communicated with the adjusting chambers corresponding thereto.

4. A precision shell making machine according to claim 3 wherein: The first cylinder body (161) is provided with a first communication port (165) and a second communication port (166) for communicating with the first chamber (163), and the first cylinder body (161) is also provided with a third communication port (167) and a fourth communication port (168) for communicating with the second chamber (164); the adjusting chambers on the two first hydraulic cylinders (150) are respectively communicated with the first communication port (165) and the third communication port (167), and the second communication port (166) and the fourth communication port (168) are respectively connected with external oil lines.

5. A precision shell making machine as claimed in claim 1 wherein: The hoisting mechanism further comprises a top rod (170) which is coaxially arranged on the housing (120) and can move along the axis of the housing (120) and rotate synchronously with the housing (120), the top rod (170) is located on the side of the main rod (131) close to the housing (120) in the axis direction of the housing (120), and two abutting balls (171) are arranged on the end of the top rod (170) close to the main rod (131) in the axis direction, and an abutting surface for abutting with the abutting balls (171) is arranged on the main rod (131), and the abutting surface is an inclined surface.

6. A precision investment shell forming machine according to claim 5 wherein: The housing (120) is provided with a second hydraulic cylinder (180), and the top rod (170) is arranged at the output end of the second hydraulic cylinder (180) and extends out of the housing (120) in the axis direction.

7. A precision shell making machine as defined in claim 1 wherein: The hoisting mechanism further comprises a transmission member (190) for driving the two booms (140) to rotate around their own axes.

8. A precision shell making machine as defined in claim 1 wherein: The driving member (110) is a mechanical arm.

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