Feeding port opening and closing device of feeding device of die-casting machine

Abstract

The utility model provides a feeding port opening and closing device of a feeding device of a die-casting machine, which relates to the technical field of feeding of the die-casting machine and comprises a charging barrel, a feeding port is arranged at the end of the charging barrel, the feeding port is obliquely arranged, and the end face of the feeding port is an inclined plane. The end part of the charging barrel is connected with a mounting plate structure, a mounting seat is movably mounted on the mounting plate structure, a hydraulic cylinder is fixedly mounted on the top side of the mounting seat, the output end of the hydraulic cylinder is connected with a length-adjustable connecting rod assembly, and a rotatable sealing gate plate is arranged at the end part of the connecting rod assembly; in the process of sealing the feeding opening, materials flowing out of the feeding opening are blocked by the sealing gate plate and the baffle, the materials are prevented from falling off from the edge of the sealing gate plate, the materials enter the flow collecting shell under the action of the baffle, and then the materials are discharged through the discharging opening and enter the injection structure of the die-casting machine. And the situation of material waste is greatly avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure casting machine feeding technology field, specifically a kind of feeding opening opening and closing device of pressure casting machine feeding device. BACKGROUND

[0002] Liquid die forging equipment is generally worth pressure casting machine, pressure casting machine is the machine for pressure casting, including hot press chamber and cold press chamber two kinds, pressure casting machine under the action of pressure melt metal liquid pressure injection into mould and cool forming, after opening mould can obtain solid metal casting, generally used for zinc alloy, magnesium alloy etc. Low melting point material's casting production, pressure casting machine feeding device is the important component of pressure casting machine, for adding the material after melting to the compression structure inside of pressure casting machine. Feeding device melts material in the process of feeding, so that material is in the state of fluid and enters into the inside of pressure casting machine pressure injection structure through feeding opening, in order to control the amount of material entering into the inside of pressure casting machine pressure injection structure, feeding opening opening and closing device is needed to open and close feeding opening, hydraulic drive type opening and closing device belongs to one kind of pressure casting machine feeding opening opening and closing device.

[0003] Hydraulic drive type opening and closing device drives piston push rod using hydraulic system, piston push rod is connected with the gate or sealing cover of feeding opening, when hydraulic oil enters the rodless cavity of hydraulic cylinder, piston push rod extends, and pushes the gate or sealing cover to move to close feeding opening, on the contrary, hydraulic oil enters the rod cavity, and piston push rod retracts, and opens feeding opening, this mode can operate the opening and closing of feeding opening although, if feeding opening is in the state of inclination, material continues to flow out in the process of closing feeding opening, part of material flowing out of feeding opening is blocked by the gate or sealing cover, at this time, the flowing area of part of material flowing out in the process of closing the gate or sealing cover increases on the gate or sealing cover, and the part of material is prone to fall from the gate or sealing cover, so that material cannot accurately enter into the inside of pressure casting machine pressure injection structure, causing the waste of material, thus the feeding opening opening and closing device of pressure casting machine feeding device needs to be designed to solve the above technical problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of feeding opening opening and closing device of pressure casting machine feeding device, to solve the problems in prior art.

[0005] To achieve the above object, the embodiment of the utility model provides a kind of feeding opening opening and closing device of pressure casting machine feeding device, comprising:

[0006] Material cylinder;

[0007] Feeding opening, set in the end position of material cylinder, the feeding opening is used to discharge the material in the inside of material cylinder, the feeding opening is obliquely arranged, and the end surface of feeding opening is inclined surface;

[0008] The mounting plate structure is connected with the end of the barrel, and is located above the feeding port, and comprises an adjusting assembly, a locking and fixing structure and a clamping locking structure.

[0009] The mounting seat is movably mounted on the mounting plate structure, and a hydraulic cylinder is fixedly mounted on the top side of the mounting seat;

[0010] The sealing gate is arranged below the mounting plate structure and corresponds to the position of the feeding port, and is used for closing the feeding port. The bottom end of the sealing gate is connected with a flow collecting shell, the cross-sectional shape of the flow collecting shell is shovel-shaped, the flow collecting shell is used for collecting materials, the bottom end of the flow collecting shell is provided with a discharge port, and the flow collecting shell and the sealing gate are both fixedly connected with a baffle, which is used for shielding materials.

[0011] The connecting rod assembly is connected with the output end of the hydraulic cylinder, and the sealing gate is rotatably connected with the connecting rod assembly, and the connecting rod assembly is used for adjusting the height of the sealing gate.

[0012] Preferably, the connecting rod assembly comprises an adjusting threaded rod, an adjusting nut and a hollow connecting rod, the adjusting threaded rod is connected with the output end of the hydraulic cylinder, the adjusting nut is threadedly connected with the adjusting threaded rod, the end of the hollow connecting rod is connected with the adjusting nut, and part of the adjusting threaded rod is located inside the hollow connecting rod.

[0013] Preferably, the mounting assembly is arranged between the sealing gate and the hollow connecting rod, the mounting assembly comprises a connecting hole one, a connecting block, a connecting hole two, a connecting threaded rod and a locking nut one, the connecting hole one is arranged on the hollow connecting rod, the connecting block is connected with the sealing gate, the connecting hole two is arranged on one side of the connecting block, the size of the connecting hole two is matched with the size of the connecting hole one, the connecting threaded rod is inserted into the connecting hole one and the connecting hole two, and the number of the locking nut one is two, and the two locking nuts are threadedly connected with the connecting threaded rod.

[0014] Preferably, the adjusting assembly is connected with the mounting seat, the adjusting assembly is used for adjusting the position of the mounting seat, the adjusting assembly comprises an adjusting plate, an adjusting sliding groove, an extension rod and a supporting block, the number of the adjusting plate is two, the two adjusting plates are symmetrically mounted at the end position of the barrel, the adjusting sliding groove is arranged on the top side of the adjusting plate, the extension rod is slidably connected with the adjusting sliding groove, the supporting block is fixedly connected with the end of the extension rod, the locking and fixing structure is arranged between the supporting block and the mounting seat, the locking and fixing structure is used for connecting the supporting block and the mounting seat, and the clamping locking structure is arranged between the adjusting plate and the extension rod, and the clamping locking structure is used for fixing the extension rod.

[0015] Preferably, the locking fixing structure comprises a positioning hole, a positioning threaded rod and a locking nut, the positioning hole is arranged on the support block, the positioning threaded rod is connected with the bottom side of the mounting seat, the positioning threaded rod is inserted into the positioning hole, and the locking nut is threadedly connected with the positioning threaded rod.

[0016] Preferably, the clamping locking structure comprises a limiting groove, a locking threaded rod and a locking nut three, the limiting groove is arranged on one side of the adjusting plate, the locking threaded rod is connected with the extension rod, and the locking nut three is threadedly connected with the locking threaded rod.

[0017] Preferably, the mounting seat and the extension rod are provided with a positioning assembly, the positioning assembly comprises a positioning hole and a positioning rod, the positioning hole is arranged on the extension rod, the positioning rod is connected with the mounting seat, and the positioning rod is inserted into the positioning hole.

[0018] Preferably, the bottom side of the mounting seat is provided with a through hole, the through hole and the center of the hollow connecting rod are located on the same vertical plane, and the diameter of the through hole is greater than the outer diameter of the hollow connecting rod.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] 1、In the process of closing the feeding opening, the material flowing out of the feeding opening is shielded by the sealing gate and the baffle, so that the material is prevented from falling from the edge of the sealing gate and is made to enter the inside of the current collecting shell under the action of the baffle, and then the material is discharged through the discharge port and enters the inside of the injection structure of the die casting machine, thereby greatly avoiding the waste of the material.

[0021] 2、The height of the sealing gate can be adjusted by the connecting rod assembly, the position of the mounting seat can be adjusted by the adjusting assembly, and then the position of the sealing gate is adjusted, so that the feeding opening opening and closing device of the die casting machine feeding device can adjust the sealing gate to a suitable position according to the length, inclination angle and angle of the inclined surface of the feeding opening, the sealing gate can better seal and shield the feeding opening, and the sealing effect of the feeding opening is better.

[0022] 3、The installation and dismounting of the sealing gate are convenient by the mounting assembly, the installation and dismounting of the mounting seat are convenient by the locking fixing structure and the positioning assembly, then the operation of assembling the feeding opening opening and closing device of the die casting machine feeding device is convenient, the overall volume of the feeding opening opening and closing device of the die casting machine feeding device can be reduced by the detachable mode, and the feeding opening opening and closing device of the die casting machine feeding device is convenient to transport and store. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the utility model.

[0024] Figure 2 It is end structure schematic view of the utility model barrel;

[0025] Figure 3 It is first visual angle structure schematic view of the utility model mounting seat;

[0026] Figure 4 It is second visual angle structure schematic view of the utility model mounting seat;

[0027] Figure 5 It is the connection structure schematic view of the utility model sealing gate and hollow connecting rod;

[0028] Figure 6 It is structure schematic view of the utility model hollow connecting rod;

[0029] Figure 7 It is structure schematic view of the utility model sealing gate;

[0030] Figure 8 It is the utility model Figure 1 It is enlarged structure schematic view of A place in the utility model.

[0031] In the figure: 10, barrel; 11, feeding opening; 12, adjusting plate; 121, limit slot; 13, adjusting sliding slot; 14, extension rod; 141, positioning hole; 15, support block; 151, positioning perforation; 16, locking threaded rod; 17, locking nut three; 20, mounting plate structure; 30, mounting seat; 31, positioning threaded rod; 32, locking nut two; 33, positioning rod; 34, through hole; 40, hydraulic cylinder; 50, connecting rod assembly; 51, adjusting threaded rod; 52, adjusting nut; 53, hollow connecting rod; 531, connecting perforation one; 60, sealing gate; 61, current collection shell; 62, discharge port; 63, baffle; 64, connecting block; 641, connecting perforation two; 65, connecting threaded rod; 66, locking nut one. DETAILED DESCRIPTION

[0032] The utility model will be further described below in conjunction with the drawings.

[0033] As Figures 1 to 8As shown, a feeding opening opening and closing device of a feeding device of a die casting machine, which comprises a feeding cylinder 10, an end of the feeding cylinder 10 is provided with a feeding opening 11, the feeding opening 11 is obliquely arranged and the end face of the feeding opening 11 is a slope, the end of the feeding cylinder 10 is connected with a mounting plate structure 20, a mounting seat 30 is movably mounted on the mounting plate structure 20, a hydraulic cylinder 40 is fixedly mounted on the top side of the mounting seat 30, an adjustable length connecting rod assembly 50 is connected with the output end of the hydraulic cylinder 40, a rotatable sealing gate 60 is arranged at the end of the connecting rod assembly 50, the sealing gate 60 is located below the mounting plate structure 20, the connecting rod assembly 50 is used for adjusting the height of the sealing gate 60, the bottom end of the sealing gate 60 is connected with a flow collecting shell 61, the cross-sectional shape of the flow collecting shell 61 is a spade shape, the flow collecting shell 61 is used for collecting materials and making the materials accurately enter the inside of the injection structure of the die casting machine, a discharging opening 62 is arranged at the bottom end of the flow collecting shell 61, the flow collecting shell 61 and one side of the sealing gate 60 are fixedly connected with a baffle 63, the baffle 63 is used for avoiding the materials from separating from the flow collecting shell 61 and the sealing gate 60.

[0034] In the process that the hydraulic cylinder 40 drives the connecting rod assembly 50 to move downward and close the feeding opening 11, the materials flowing out of the feeding opening 11 are shielded by the sealing gate 60 and the baffle 63, the materials are prevented from falling from the edge of the sealing gate 60, and the materials enter the inside of the flow collecting shell 61 under the action of the baffle 63, then the materials are discharged through the discharging opening 62 and enter the inside of the injection structure of the die casting machine, thereby the waste of the materials is avoided.

[0035] The connecting rod assembly 50 comprises an adjusting threaded rod 51 connected with the output end of the hydraulic cylinder 40, an adjusting nut 52 is threadedly connected with the outer surface of the adjusting threaded rod 51, a hollow connecting rod 53 is fixedly connected with one side of the adjusting nut 52, and the sealing gate 60 is rotatably connected with the hollow connecting rod 53.

[0036] The position of the hollow connecting rod 53 can be adjusted by rotating the position of the adjusting nut 52, and then the distance between the sealing gate 60 and the feeding opening 11 can be adjusted, the sealing gate 60 is adjusted to a suitable position according to the length, the inclination angle and the inclination angle of the slope of the feeding opening 11, so that the sealing gate 60 can better seal and shield the feeding opening 11.

[0037] It should be noted that part of the adjusting threaded rod 51 is located in the inside of the hollow connecting rod 53, and the maximum diameter of the adjusting threaded rod 51 is smaller than the inner diameter of the hollow connecting rod 53, so that the hollow connecting rod 53 can be smoothly rotated and moved without interference with the adjusting threaded rod 51.

[0038] The mounting assembly is arranged between the sealing gate plate 60 and the hollow connecting rod 53, and comprises a connecting hole one 531 arranged on the hollow connecting rod 53 and a connecting block 64 connected with the sealing gate plate 60. The connecting block 64 is in a U shape, and the outer diameter of the hollow connecting rod 53 is matched with the width of the inner size of the connecting block 64, so that the hollow connecting rod 53 can avoid left and right movement of the connecting block 64 after entering the inside of the connecting block 64. A connecting hole two 641 is arranged on the connecting block 64, and a connecting threaded rod 65 is inserted into the connecting hole one 531 and the connecting hole two 641. Two locking nuts one 66 are threadedly connected to the outer surface of the connecting threaded rod 65.

[0039] When connecting the sealing gate plate 60 and the hollow connecting rod 53, first, the connecting block 64 is sleeved on the outer surface of the hollow connecting rod 53, and the centers of the connecting hole one 531 and the connecting hole two 641 are matched. Then, the connecting threaded rod 65 passes through the inside of the connecting hole one 531 and the connecting hole two 641. Then, the locking nut one 66 is connected with the connecting threaded rod 65, and the locking nut one 66 is attached to the connecting block 64, thereby completing the operation of connecting the sealing gate plate 60 and the hollow connecting rod 53. The operation of installing the sealing gate plate 60 is relatively simple, and the sealing gate plate 60 can be easily removed and cleaned or replaced, thereby avoiding the situation that the material adhered to the sealing gate plate 60 causes the feeding opening 11 to be not tightly closed.

[0040] It should be noted that after the locking nut one 66 is rotated, the connecting block 64 can still rotate around the center direction of the connecting threaded rod 65, so as to ensure the connection stability of the sealing gate plate 60 and the hollow connecting rod 53 while the sealing gate plate 60 smoothly rotates and seals the feeding opening 11.

[0041] The adjusting assembly is arranged on the mounting plate structure 20 and connected with the mounting seat 30. The adjusting assembly is used for adjusting the position of the mounting seat 30. The adjusting assembly comprises two adjusting plates 12 connected with the barrel 10. The top side of each adjusting plate 12 is provided with an adjusting sliding groove 13. The inside of each adjusting sliding groove 13 is slidably connected with an extension rod 14. The end of each extension rod 14 is fixedly connected with a support block 15 connected with the mounting seat 30. A locking and fixing structure is arranged between the support block 15 and the mounting seat 30. The locking and fixing structure is used for connecting the support block 15 and the mounting seat 30. A clamping and locking structure is arranged between the adjusting plate 12 and the extension rod 14. The clamping and locking structure is used for fixing the extension rod 14.

[0042] The locking and fixing structure comprises positioning holes 151 formed on the two supporting blocks 15 and two positioning threaded rods 31 connected with the mounting seat 30, the positioning threaded rods 31 are inserted into the inside of the positioning holes 151, the positioning threaded rods 31 are in one-to-one correspondence with the positioning holes 151, and the outer surfaces of the two positioning threaded rods 31 are threadedly connected with locking nuts 32.

[0043] When the mounting seat 30 is fixed, the positioning threaded rods 31 are inserted into the inside of the positioning holes 151, the mounting seat 30 is overlapped on the adjusting plate 12, the locking nuts 32 are threadedly connected with the positioning threaded rods 31, and the locking nuts 32 are tightly attached to the bottom side of the adjusting plate 12, so that the mounting seat 30 is fixed, and the fixing operation of the mounting seat 30 is relatively simple.

[0044] The clamping and locking structure comprises a limiting groove 121 formed on one side of the adjusting plate 12 and a locking threaded rod 16 connected with the extension rod 14, the locking threaded rod 16 passes through the inside of the limiting groove 121 and is slidably connected with the limiting groove 121, and the outer surface of the locking threaded rod 16 is threadedly connected with a locking nut 17.

[0045] When the position of the supporting block 15 is adjusted, the supporting block 15 drives the extension rod 14 to move, in the moving process of the extension rod 14, the locking threaded rod 16 drives the locking nut 17 to move along the direction of the limiting groove 121, when the extension rod 14 moves to a suitable position, the locking nut 17 is rotated to be tightly attached to the adjusting plate 12, so that the extension rod 14 is fixed, the extension rod 14 and the supporting block 15 are fixed at a suitable position, the position of the mounting seat 30 can be adjusted by adjusting the positions of the supporting block 15 and the extension rod 14, the distance between the sealing shutter 60 and the feeding opening 11 can be adjusted, the sealing shutter 60 can be adjusted to a suitable position according to the length of the feeding opening 11, so that the sealing shutter 60 can better shield and seal the feeding opening 11.

[0046] It should be noted that the width of the mounting seat 30 is greater than the maximum distance between the two adjusting plates 12, so that the mounting seat 30 can be stably overlapped on the adjusting plate 12, and the minimum distance between the two adjusting plates 12 is greater than the outer diameter of the hollow connecting rod 53, so that the hollow connecting rod 53 can be smoothly moved without interference with the adjusting plate 12.

[0047] The mounting seat 30 and the extension rod 14 are provided with a positioning assembly, the positioning assembly comprises a positioning hole 141 formed on the extension rod 14 and a positioning rod 33 connected with the mounting seat 30, and the positioning rod 33 is inserted into the inside of the positioning hole 141.

[0048] After the positioning threaded rod 31 is inserted into the inside of the positioning through hole 151, the positioning rod 33 is inserted into the inside of the positioning hole 141, the mounting seat 30 is positioned by the positioning rod 33 and the positioning hole 141, and the stability of the mounting seat 30 can be ensured.

[0049] The bottom side of the mounting seat 30 is provided with a through hole 34, the center position of the through hole 34 and the hollow connecting rod 53 are in the same vertical plane, and the diameter of the through hole 34 is greater than the outer diameter of the hollow connecting rod 53, so that the hollow connecting rod 53 can smoothly pass through the inside of the through hole 34 and move.

[0050] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to embrace all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0051] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A gating device for a feed opening of a feed apparatus of a die casting machine, characterized in that, The utility model relates to a material feeding device, which comprises the following components: a material cylinder (10); a feeding opening (11) arranged at the end of the material cylinder (10), which is used to discharge the material in the material cylinder (10), and the feeding opening (11) is arranged obliquely and the end surface of the feeding opening (11) is beveled; a mounting plate structure (20) connected to the end of the material cylinder (10), which is located above the feeding opening (11), and the mounting plate structure (20) comprises an adjusting assembly, a locking and fixing structure, and a clamping and locking structure; a mounting seat (30) movably mounted on the mounting plate structure (20), and a hydraulic cylinder (40) is fixedly mounted on the top side of the mounting seat (30); a sealing gate (60) arranged below the mounting plate structure (20) and corresponding to the position of the feeding opening (11), which is used to close the feeding opening (11), and the bottom end of the sealing gate (60) is connected with a flow collecting shell (61), the cross-sectional shape of the flow collecting shell (61) is shovel-shaped, which is used to collect the material, the bottom end of the flow collecting shell (61) is provided with a discharge opening (62), and the flow collecting shell (61) and one side of the sealing gate (60) are fixedly connected with a baffle (63), which is used to shield the material; a connecting rod assembly (50) connected to the output end of the hydraulic cylinder (40), and the sealing gate (60) is rotationally connected with the connecting rod assembly (50), which is used to adjust the height of the sealing gate (60).

2. The opening and closing device for the feed opening of the feed device of the die casting machine according to claim 1, characterized in that: The connecting rod assembly (50) comprises an adjusting threaded rod (51), an adjusting nut (52), and a hollow connecting rod (53), the adjusting threaded rod (51) is connected to the output end of the hydraulic cylinder (40), the adjusting nut (52) is threadedly connected with the adjusting threaded rod (51), the end of the hollow connecting rod (53) is connected with the adjusting nut (52), and part of the adjusting threaded rod (51) is located in the hollow connecting rod (53).

3. The opening and closing device for the feed opening of the feed device of the die casting machine according to claim 2, characterized in that: An installation assembly is arranged between the sealing gate (60) and the hollow connecting rod (53), which comprises a connecting hole one (531), a connecting block (64), a connecting hole two (641), a connecting threaded rod (65), and a locking nut one (66), the connecting hole one (531) is arranged on the hollow connecting rod (53), the connecting block (64) is connected with the sealing gate (60), the connecting hole two (641) is arranged on one side of the connecting block (64), and the size of the connecting hole two (641) is matched with the size of the connecting hole one (531), the connecting threaded rod (65) is inserted into the connecting hole one (531) and the connecting hole two (641), and the number of the locking nut one (66) is two, and the two locking nut ones (66) are threadedly connected with the connecting threaded rod (65).

4. The opening and closing device for the feed opening of the feed apparatus of the die casting machine according to claim 2, characterized in that: The adjusting assembly is connected with the mounting base (30), the adjusting assembly is used for adjusting the position of the mounting base (30), the adjusting assembly comprises an adjusting plate (12), an adjusting sliding groove (13), an extension rod (14) and a supporting block (15), the number of the adjusting plate (12) is two, the two adjusting plates (12) are symmetrically installed at the end position of the barrel (10), the adjusting sliding groove (13) is opened at the top side of the adjusting plate (12), the extension rod (14) is in sliding connection with the adjusting sliding groove (13), the supporting block (15) is fixedly connected with the end of the extension rod (14), the locking fixing structure is arranged between the supporting block (15) and the mounting base (30), the locking fixing structure is used for connecting the supporting block (15) and the mounting base (30), and the clamping locking structure is arranged between the adjusting plate (12) and the extension rod (14), and the clamping locking structure is used for fixing the extension rod (14).

5. The opening and closing device for the filling opening of a filling device of a die casting machine according to claim 4, characterized in that: The locking fixing structure comprises a positioning through hole (151), a positioning threaded rod (31) and a locking nut two (32), the positioning through hole (151) is opened on the supporting block (15), the positioning threaded rod (31) is connected with the bottom side of the mounting base (30), the positioning threaded rod (31) is inserted into the inside of the positioning through hole (151), and the locking nut two (32) is in threaded connection with the positioning threaded rod (31).

6. The opening and closing device for the filling opening of a filling device of a die casting machine according to claim 5, characterized in that: The clamping locking structure comprises a limiting groove (121), a locking threaded rod (16) and a locking nut three (17), the limiting groove (121) is opened on one side of the adjusting plate (12), the locking threaded rod (16) is connected with the extension rod (14), and the locking nut three (17) is in threaded connection with the locking threaded rod (16).

7. The opening and closing device for the filling opening of a filling device of a die casting machine according to claim 5, characterized in that: The mounting base (30) is provided with a positioning assembly between the extension rod (14), the positioning assembly comprises a positioning hole (141) and a positioning rod (33), the positioning hole (141) is opened on the extension rod (14), and the positioning rod (33) is connected with the mounting base (30) and is inserted into the inside of the positioning hole (141).

8. The opening and closing device for the feed opening of a feed device of a die casting machine according to claim 7, characterized in that: The bottom side of the mounting base (30) is provided with a through hole (34), the through hole (34) and the center position of the hollow connecting rod (53) are located on the same vertical plane, and the diameter of the through hole (34) is greater than the outer diameter of the hollow connecting rod (53).

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