A method for processing multiple holes in the web of a boom head

Abstract

A method for machining multiple holes in a boom head web comprises the following steps: Step 1: rough machining the pulley shaft mounting hole and the basic hole machining for the rope stop rod mounting hole on the middle web; Step 2: rough machining the pulley shaft mounting hole on the outer web; Step 3: welding the middle web and the outer web to the boom head using a mandrel and a spacer; Step 4: fine machining the pulley shaft mounting holes of the middle web and the outer web; Step 5: machining the rope stop rod mounting hole of the outer web; Step 6: measuring and calculating the eccentricity between each basic hole of the middle web and the rope stop rod mounting hole of the outer web; Step 7: manufacturing an eccentric sleeve based on the eccentricity and the diameter of the basic hole of the middle web; Step 8: inserting the eccentric sleeves one by one into the basic holes of the corresponding middle web. Therefore, this design can efficiently machine coaxial multiple holes with high coaxiality and small diameter on the boom head web.

Description

Technical Field

[0001] The invention relates to a multi-hole processing method, belongs to the technical field of crane component processing, and in particular to a multi-hole processing method for a boom head web. Background Art

[0002] The boom is an important component of crane equipment. Its head is equipped with multiple webs for installing pulleys in parallel. There are two groups of coaxial holes on the webs, one group is used to install the pulley shaft, and the other group is used to install the rope stop rod of the wire rope. The coaxiality of each group of holes in these two groups of holes is required to be high, and the hole spacing between the two groups of holes is required to be high. If the coaxiality cannot be guaranteed, it will affect the smooth installation of the pulley group and the rope stop rod; if the hole spacing is out of tolerance, it will cause the wire rope to be too tight (when the hole spacing is too small) or too loose (when the hole spacing is too large) when passing through the space area formed by the pulley rope groove and the rope stop rod; too tight will cause the wire rope to be squeezed and deformed, and may even get stuck or break; too loose will cause the wire rope to fall off or become tangled, etc., thereby affecting the normal operation of the crane. At present, the pulley shaft mounting hole and the rope stop rod mounting hole on the pulley web of the boom head are processed on a large CNC boring machine. However, due to the small diameter of the rope stop rod mounting hole, the boring bar of the large CNC boring machine cannot pass through directly. It is necessary to make a special transition slender tooling boring bar to assist in completing the processing. However, the rigidity of the transition slender tooling boring bar is poor and it is easy to shake during processing. Therefore, the feed rate of the tool must be as small as possible during the boring process, which results in extremely low boring processing efficiency, long processing cycle and high cost. At the same time, it also leads to poor aperture tolerance, position and coaxiality of the rope stop rod mounting hole, and the hole distance with the pulley shaft mounting hole is out of tolerance.

[0003] The Chinese patent application with application number 202111539224.6 and application date December 15, 2021, discloses a synchronous boring method for multi-hole arm structure parts. The laser tracker and wireless intelligent probe are used to accurately locate and mark the hole system required for fine processing of the structural parts. The boring equipment is then used to perform rough boring of the structural parts after concentric positioning. The laser tracker is then used for secondary precision re-measurement and fine-tuning during the process. Finally, the hole system is fine-processed, thereby realizing the use of equipment to complete the hole system processing of large arm structure parts. It has the advantages of reasonable process, simple operation, high processing accuracy and quality, and has a greater cost advantage than the large-scale special equipment processing method, but it still has the following defects:

[0004] This design cannot efficiently process coaxial multiple holes with high coaxiality and small diameter on the web of the boom head.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects and problems in the prior art that it is impossible to efficiently process coaxial multiple holes with high coaxiality and small diameter on the web of the boom head, and to provide a processing method that can efficiently process coaxial multiple holes with high coaxiality and small diameter on the web of the boom head.

[0007] To achieve the above objectives, the technical solution of the present invention is: a method for processing a multi-hole web of a boom head includes the following steps:

[0008] The first step: the boom head web includes several middle webs and two outer webs; first, fix the middle webs in groups on a lathe, and then, according to the drawings, mark the position center lines of the pulley shaft mounting holes and the rope stop rod mounting holes on the middle webs fixed as one, and then, based on the position center lines of the pulley shaft mounting holes, perform rough machining of the pulley shaft mounting holes on the middle webs fixed as one; based on the position center lines of the rope stop rod mounting holes, perform basic hole machining of the rope stop rod mounting holes on the middle webs fixed as one, and after machining, remove the middle webs;

[0009] Step 2: First, fix the two outer webs as a group on the lathe, then according to the drawing, mark the center line of the pulley shaft mounting hole on the outer web, and then use the center line of the pulley shaft mounting hole on the outer web as a reference to perform rough machining of the pulley shaft mounting hole on the two outer webs fixed as a whole. After the machining is completed, remove the two outer webs;

[0010] Step 3: First, use several mandrels and several spacers to string together the multiple processed intermediate webs into one piece, then align the assembled intermediate webs with the boom head, and weld them one by one to the boom head until all the intermediate webs are welded, then remove the mandrels and spacers; then use several mandrels and several spacers to string together the two processed outer webs and the welded intermediate webs, and after determining the positions, weld the two outer webs to the outermost left and right sides of the intermediate webs respectively;

[0011] Step 4: First, using the roughly machined pulley shaft mounting hole as a reference, respectively carve the theoretical contour lines of the pulley shaft mounting hole on the outer end surfaces of the two outer webs according to the drawing. Then, using the carved center position line of the pulley shaft mounting hole and the theoretical contour line as a reference, complete the fine machining of the pulley shaft mounting holes on multiple pieces of the middle webs and the two outer webs in a single clamping process on the boring machine. Stop fine machining when the inner hole diameter of the pulley shaft mounting hole meets the requirements of the drawing.

[0012] Step 5: First, using the processed pulley shaft mounting hole as a reference and in combination with the drawing, respectively mark the center position line of the rope stop rod mounting hole and the outline line of the drawing on the outer end surfaces of the two outer webs, and then respectively use the center position line and outline line of the rope stop rod mounting hole on the carved outer web as a reference to machine the rope stop rod mounting holes on the two outer webs. After the machining is completed, stop machining the rope stop rod mounting holes on the outer webs;

[0013] Step 6: First, using the rope stop rod mounting holes on the two processed outer webs as a reference, measure the center position of the basic hole on each middle web one by one, and then calculate the measured distances between the center of the basic hole on each middle web and the center of the rope stop rod mounting holes on the two outer webs based on the measured center positions of the basic hole on the middle web and the center positions of the rope stop rod mounting holes on the two outer webs; finally, compare the center distances one by one with their theoretical distance values ​​to obtain the eccentricity of the basic hole on each middle web relative to the rope stop rod mounting hole on the outer web;

[0014] Step 7: According to the eccentricity of the basic hole on each intermediate web relative to the rope retaining rod mounting hole on the outer web, and the aperture of each basic hole, respectively make an eccentric sleeve adapted to each intermediate web;

[0015] Step 8: Install the eccentric sleeve into the corresponding base hole of the middle web.

[0016] In the first step, the rough machining of the pulley shaft mounting holes on the plurality of intermediate webs fixed as one piece comprises: turning the positions of the pulley shaft mounting holes on the plurality of intermediate webs fixed as one piece on a lathe until the single-side machining allowance of the pulley shaft mounting holes on the plurality of intermediate webs reaches 4.5-10 mm, and then stopping the rough machining of the pulley shaft mounting holes on the intermediate webs;

[0017] In the first step, the basic hole machining of the rope stop rod mounting holes on the plurality of intermediate webs fixed as one piece comprises: lathing the positions of the rope stop rod mounting holes on the plurality of intermediate webs fixed as one piece on a lathe until the diameter of the machined holes is 8-10 mm larger than the theoretical diameter of the rope stop rod mounting holes as shown in the drawings, and then stopping the machining, wherein the machined holes are basic holes;

[0018] In the second step, the rough machining of the pulley shaft mounting holes on the two outer webs fixed as one refers to: turning the positions of the pulley shaft mounting holes on the two outer webs fixed as one on a lathe until the single-sided machining allowance of the pulley shaft mounting holes on the two outer webs fixed as one reaches 4.5-10 mm, and then stopping the rough machining of the pulley shaft mounting holes on the outer webs.

[0019] In the fourth step, completing the fine processing of the pulley shaft mounting holes on the multiple intermediate webs and the two outer webs during one clamping process on the boring machine means: during one clamping process on the boring machine, the boring bar is passed through the pulley shaft mounting holes that have been roughly processed on the multiple intermediate webs and the two outer webs, and the boring machine drives the boring bar to rotate at a position close to the pulley shaft mounting holes to fine process the pulley shaft mounting holes on the multiple intermediate webs and the two outer webs.

[0020] In the fifth step, the rope stop rod mounting holes on the two outer webs are processed separately, and after the processing is completed, the processing of the rope stop rod mounting holes on the outer webs is stopped, which means: first, the rope stop rod mounting hole on one outer web is processed by boring, and when the diameter of the rope stop rod mounting hole on one outer web reaches the requirements of the drawing, the processing of the rope stop rod mounting hole on this outer web is stopped, and then the rope stop rod mounting hole on the other outer web is processed by boring, and when the diameter of the rope stop rod mounting hole on the other outer web reaches the requirements of the drawing, the processing of the rope stop rod mounting hole on the other outer web is stopped.

[0021] In the third step, the mandrel includes a first mandrel and a second mandrel, the diameter of the first mandrel matches the aperture of the basic hole, and the diameter of the first mandrel is 0.5-1.5 mm smaller than the aperture of the basic hole;

[0022] The diameter of the second mandrel matches the diameter of the pulley shaft mounting hole, and the diameter of the second mandrel is 0.5-1.5 mm smaller than the diameter of the pulley shaft mounting hole;

[0023] The number of the spacers is the same as the number of intervals between the middle webs, and the axial length of the spacers is the same as the distance between two adjacent middle webs required by the drawings.

[0024] In the third step, the step of first assembling the multiple processed intermediate webs into one piece by using a plurality of mandrels and a plurality of spacers means that: first, a matching first mandrel is sequentially passed through the basic holes and spacers on all the intermediate webs, the spacers are placed at the basic holes of the intermediate webs and sandwiched between adjacent intermediate webs, and at the same time, a matching second mandrel is sequentially passed through the pulley shaft mounting holes of all the intermediate webs;

[0025] In the third step, the use of several core shafts and several spacers to string together the two processed outer webs and the welded middle webs means: spot welding several spacers on adjacent middle webs, and at the same time, passing the second core shaft through the pulley shaft mounting holes of the outer web on the left, all the middle webs, and the outer web on the right in turn.

[0026] In the sixth step, the distances between the center of the basic hole on each middle web and the center of the rope stop rod mounting hole on the outer web obtained by the measurement are calculated one by one, which means: taking the rope stop rod mounting hole of the outer web as a reference, drawing a cross center line, and measuring the distances from four symmetrical points of the basic hole of the middle web to the rope stop rod mounting hole, the distances from two longitudinally symmetrical points to the rope stop rod mounting hole are L1 and L2 respectively, and the distances from two transversely symmetrical points to the rope stop rod mounting hole are L3 and L4 respectively;

[0027] In the sixth step, the center distances are finally compared with their theoretical distance values ​​one by one to obtain the eccentricity of the basic hole on each middle web relative to the rope stop rod mounting hole on the outer web: the vertical distance between the basic hole of the middle web and the center of the rope stop rod mounting hole of the outer web is (L1-L2) / 2, the horizontal distance between the basic hole of the middle web and the center of the rope stop rod mounting hole of the outer web is (L3-L4) / 2, and the eccentricity

[0028] In the seventh step, the eccentric sleeve includes an inner hole and an outer circular surface of the eccentric sleeve;

[0029] The eccentricity of the inner hole of the eccentric sleeve is equal to the eccentricity of the basic hole on the corresponding middle web relative to the rope stop rod mounting hole on the outer web, and the diameter and tolerance of the inner hole of the eccentric sleeve are the same as the diameter and tolerance of the rope stop rod mounting hole required by the drawing;

[0030] The outer circular surface matches the aperture of the basic hole on the corresponding middle web.

[0031] In the eighth step, the eccentric sleeve is embedded into the basic hole of the corresponding intermediate web, which means that the eccentric sleeve and the basic hole of the corresponding intermediate web are interference fit, and the theoretical cooling time of the eccentric sleeve is calculated according to the interference fit between the outer cylindrical surface and the basic hole, and then the eccentric sleeve is cooled according to the theoretical cooling time, and then the cooled eccentric sleeves are embedded one by one into the basic hole of the corresponding intermediate web. When the eccentric sleeve returns to normal temperature, the eccentric sleeve and the basic hole of the intermediate web are interference fit.

[0032] Cooling the eccentric sleeves according to the theoretical cooling time and then fitting the cooled eccentric sleeves into the basic holes of the corresponding intermediate webs one by one means: placing the eccentric sleeves into a heat preservation box filled with coolant to cool them, taking out the eccentric sleeves after the cooling time is reached, and fitting them into the basic holes of the corresponding intermediate webs;

[0033] The interference fit between the outer cylindrical surface of the eccentric sleeve and the basic hole is 0.02-0.04 mm.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. A method for processing multiple holes in the web of a boom head, comprising the following steps: the first step: performing rough machining of the pulley shaft mounting hole and the basic hole machining of the rope stop rod mounting hole on the middle web fixed as one, the second step: performing rough machining of the pulley shaft mounting hole on the outer web fixed as one, the third step: using a mandrel and a spacer to weld the middle web and the outer web to the boom head respectively, the fourth step: performing fine machining of the pulley shaft mounting holes of multiple middle webs and two outer webs, the fifth step: machining the rope stop rod mounting holes of the outer web, the sixth step: measuring and calculating the basic hole of each middle web and the outer web stop hole. The eccentricity of the rope rod mounting hole, the seventh step: make an eccentric sleeve according to the eccentricity and the aperture of the basic hole on the middle web, the eighth step: embed the eccentric sleeves one by one into the basic hole of the corresponding middle web, in the first and second steps, turn the position of the pulley shaft mounting hole of the middle web or the outer web on a lathe until the single-sided machining allowance of the pulley shaft mounting hole reaches 4.5-10mm, stop the rough machining of the pulley shaft mounting hole, turn the position of the rope rod mounting hole on the middle web on a lathe until the diameter of the basic hole is 8-10mm larger than the theoretical diameter of the drawing, and stop machining, in the fourth step, During the last clamping process of the boring machine, the boring machine drives the boring bar to rotate to fine-machine the pulley shaft mounting holes on the multiple intermediate webs and the two outer webs. In the fifth step, the rope stop rod mounting hole on one outer web is first machined by boring. When the diameter of the rope stop rod mounting hole on this side reaches the requirements of the drawing, the machining of the rope stop rod mounting hole on this outer web is stopped. Then the rope stop rod mounting hole on the other outer web is machined by boring. When the diameter of the rope stop rod mounting hole on the other side reaches the requirements of the drawing, the machining of the rope stop rod mounting hole on the other outer web is stopped. When applied, multiple intermediate webs are rough-machined in groups on a lathe before welding. The pulley shaft mounting holes on the web and the two outer webs and the basic holes for the rope stop rod mounting holes on the middle web are then fine-machined on a boring machine for the pulley shaft mounting holes of the multiple middle webs and the two outer webs, and then the rope stop rod mounting holes of the outer webs are machined on a boring machine. Because the lathe has a fast turning speed and high group processing efficiency, and the boring machine processing can improve the accuracy of the aperture, the lathe and the boring machine are combined to improve the processing efficiency, shorten the processing cycle, and thus reduce the processing cost. At the same time, due to the use of a mandrel and a spacer during welding, the pulley shaft mounting holes of all webs and the rope stop rod mounting holes of the middle web have high coaxiality. Therefore, the present invention can not only process rope stop rod mounting holes with high coaxiality and precise aperture, but also greatly improve the processing efficiency and reduce the processing cost.

[0036] 2. In a method for processing a multi-hole web of a boom head, in the third step, the mandrel includes a first mandrel and a second mandrel, the diameter of the first mandrel matches the aperture of the basic hole, the diameter of the second mandrel matches the aperture of the pulley shaft mounting hole, the number of the spacers is the same as the number of intervals of the intermediate webs, the axial length of the spacers is the same as the spacing between two adjacent intermediate webs required by the drawing, first, the matching first mandrel is passed through the basic holes and spacers on all the intermediate webs in sequence, the spacers are placed at the basic holes of the intermediate webs, and clamped between adjacent intermediate webs, and at the same time, the matching second mandrel is passed through the basic holes and spacers on all the intermediate webs in sequence. After the pulley shaft mounting hole is completed by welding the middle web, several spacers are spot-welded on the adjacent middle webs. At the same time, the second spindle is sequentially passed through the pulley shaft mounting holes of the outer web on the left, all the middle webs, and the outer web on the right to complete the welding of the outer webs. When used, several spindles and several spacers are first used to string together multiple middle webs and weld them one by one to the boom head. Then, several spindles and several spacers are used again to weld the two outer webs to the outermost sides of the middle web of the boom head. The use of spindles can ensure the coaxiality of the base holes of the pulley shaft mounting hole and the rope stop rod mounting hole, and the use of spacers can ensure the spacing between multiple adjacent middle webs. Therefore, the present invention can not only ensure the coaxiality of the rope stop rod mounting hole and the pulley shaft mounting hole, but also ensure the spacing between adjacent middle webs.

[0037] 3. In a method for processing a multi-hole web of a boom head, in the sixth step, with the outer web rope stop rod mounting hole as a reference, a cross center line is drawn to measure the distances from the four symmetrical points of the basic hole of the middle web to the rope stop rod mounting hole. The distances from the two longitudinally symmetrical points to the rope stop rod mounting hole are L1 and L2 respectively, and the distances from the two transversely symmetrical points to the rope stop rod mounting hole are L3 and L4 respectively. The vertical distance between the basic hole of the middle web and the center of the rope stop rod mounting hole of the outer web is (L1-L2) / 2, the horizontal distance between the basic hole of the middle web and the center of the rope stop rod mounting hole of the outer web is (L3-L4) / 2, and the eccentricity is In the seventh step, the eccentric sleeve includes an eccentric sleeve inner hole and an outer circular surface; the eccentricity of the eccentric sleeve inner hole is equal to the eccentricity of the basic hole on the matching middle web relative to the rope stop rod mounting hole on the outer web, the diameter and tolerance of the eccentric sleeve inner hole are the same as the diameter and tolerance of the rope stop rod mounting hole required by the drawing, the outer circular surface matches the aperture of the basic hole on the matching middle web, the eccentric sleeve and the basic hole of the matching middle web adopt interference fit, and the cooled eccentric sleeves are embedded one by one into the matching middle web. In the basic hole of the web, the interference fit between the outer cylindrical surface of the eccentric sleeve and the basic hole is 0.02-0.04mm. When used, an eccentric sleeve for the basic hole on the middle web is manufactured according to the basic hole diameter of the rope stop rod mounting hole and the measured eccentricity of the basic hole on the middle web relative to the rope stop rod mounting holes on the two outer webs. By cooling the eccentric sleeve and then inserting it into the basic hole on the middle web, the coaxiality of the rope stop rod mounting hole and the hole spacing between the rope stop rod mounting hole and the pulley shaft mounting hole are made to meet the requirements. Therefore, the present invention not only ensures the coaxiality of the rope stop rod mounting hole, but also ensures the hole spacing requirements between the rope stop rod mounting hole and the pulley shaft mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the processing method of the present invention.

[0039] Figure 2 It is a schematic diagram of the web structure of the boom head in the present invention.

[0040] Figure 3 It is a schematic diagram of the single-piece web structure of the boom head in the present invention.

[0041] Figure 4 It is a schematic diagram of the fixing of multiple intermediate webs in groups in the present invention.

[0042] Figure 5 It is a schematic diagram of the assembly and welding of multiple intermediate webs in the present invention.

[0043] Figure 6 It is a schematic diagram of multiple intermediate webs installed in the eccentric sleeve in the present invention.

[0044] Figure 7 It is a schematic diagram of the arm support in the present invention.

[0045] Figure 8 It is a side view of the arm D in the present invention.

[0046] Figure 9 It is a side view of a single web in the present invention.

[0047] Figure 10 It is a schematic diagram of the eccentric sleeve in the present invention.

[0048] Figure 11It is a schematic diagram of the relationship between the outer web rope retaining rod mounting hole and the middle web base hole in the present invention.

[0049] In the figure: middle web 1, first spindle 11, second spindle 12, spacer 13, outer web 2, eccentric sleeve inner hole 21, outer cylindrical surface 22, eccentric sleeve 23, pulley shaft mounting hole 3, rope stop rod mounting hole 4, foundation hole 41. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] See also Figure 1 — Figure 11 A method for processing a multi-hole web of a boom head includes the following steps:

[0052] Step 1: The boom head web includes several middle webs 1 and two outer webs 2; first, fix the middle webs 1 in groups on a lathe, and then, according to the drawing, mark the position center lines of the pulley shaft mounting holes 3 and the rope stop rod mounting holes 4 on the middle webs 1 fixed as one, and then, based on the position center lines of the pulley shaft mounting holes 3, perform rough machining of the pulley shaft mounting holes 3 on the middle webs 1 fixed as one; and based on the position center lines of the rope stop rod mounting holes 4, perform basic hole 41 machining on the rope stop rod mounting holes 4 on the middle webs 1 fixed as one, and after machining, remove the middle webs 1;

[0053] Step 2: First, fix the two outer webs 2 as a group on the lathe, and then, according to the drawing, mark the center line of the pulley shaft mounting hole 3 on the outer web 2. Then, based on the center line of the pulley shaft mounting hole 3 on the outer web 2, perform rough machining of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one. After the machining is completed, remove the two outer webs 2.

[0054] Step 3: First, use a number of mandrels and a number of spacers 13 to string together the multiple processed intermediate webs 1, then align the assembled intermediate webs 1 with the boom head, and weld them one by one to the boom head until all the intermediate webs 1 are welded, then remove the mandrels and spacers 13; then use a number of mandrels and a number of spacers 13 to string together the two processed outer webs 2 and the welded intermediate webs 1, and after determining the positions, weld the two outer webs 2 to the outermost left and right sides of the intermediate web 1 respectively;

[0055] Step 4: First, using the roughly machined pulley shaft mounting hole 3 as a reference, respectively carve the theoretical contour lines of the pulley shaft mounting hole 3 on the outer end surfaces of the two outer webs 2 according to the drawing. Then, using the carved center position line of the pulley shaft mounting hole 3 and the theoretical contour line as a reference, complete the fine machining of the pulley shaft mounting holes 3 on multiple pieces of the intermediate webs 1 and the two outer webs 2 in a single clamping process on the boring machine. Stop fine machining when the inner hole diameter of the pulley shaft mounting hole 3 meets the requirements of the drawing.

[0056] Step 5: First, using the processed pulley shaft mounting hole 3 as a reference and in combination with the drawing, respectively mark the center position line and the outline line of the drawing on the outer end surface of the two outer webs 2, and then respectively use the center position line and outline line of the rope stop rod mounting hole 4 on the carved outer web 2 as a reference to respectively machine the rope stop rod mounting holes 4 on the two outer webs 2. After the machining is completed, stop machining the rope stop rod mounting holes 4 on the outer webs 2;

[0057] Step 6: First, using the rope stop rod mounting holes 4 on the two processed outer webs 2 as a reference, measure the center position of the basic hole 41 on each intermediate web 1 one by one, and then calculate the measured distances between the center of the basic hole 41 on each intermediate web 1 and the center of the rope stop rod mounting holes 4 on the two outer webs 2 according to the measured center positions of the basic hole 41 on the intermediate web 1 and the center positions of the rope stop rod mounting holes 4 on the two outer webs 2; finally, compare the center distances one by one with their theoretical distance values ​​to obtain the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2;

[0058] Step 7: According to the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope retaining rod mounting hole 4 on the outer web 2, and the aperture of each basic hole 41, respectively make an eccentric sleeve 23 adapted to each intermediate web 1;

[0059] Step 8: Insert the eccentric sleeve 23 into the corresponding basic hole 41 of the middle web 1 .

[0060] In the first step, the rough machining of the pulley shaft mounting holes 3 on the plurality of the intermediate webs 1 fixed as one body comprises: turning the positions of the pulley shaft mounting holes 3 on the plurality of the intermediate webs 1 fixed as one body on a lathe until the single-side machining allowance of the pulley shaft mounting holes 3 on the plurality of the intermediate webs 1 reaches 4.5-10 mm, and then stopping the rough machining of the pulley shaft mounting holes 3 on the intermediate webs 1;

[0061] In the first step, machining the basic holes 41 of the rope stopper rod mounting holes 4 on the plurality of intermediate webs 1 fixed as one body comprises: lathing the positions of the rope stopper rod mounting holes 4 on the plurality of intermediate webs 1 fixed as one body on a lathe until the diameter of the machined holes is 8-10 mm larger than the theoretical diameter of the rope stopper rod mounting holes 4 as shown in the drawings, and then stopping machining. The machined holes are the basic holes 41.

[0062] In the second step, the rough machining of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one is to turn the position of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one on a lathe until the single-sided machining allowance of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one reaches 4.5-10 mm, and then stop the rough machining of the pulley shaft mounting hole 3 on the outer web 2.

[0063] In the fourth step, completing the fine processing of the pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2 during one clamping process on the boring machine means: during one clamping process on the boring machine, the boring bar is passed through the rough-machined pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2, and at a position close to the pulley shaft mounting holes 3, the boring machine drives the boring bar to rotate to fine-process the pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2.

[0064] In the fifth step, the rope stop rod mounting holes 4 on the two outer webs 2 are processed separately. After the processing is completed, the processing of the rope stop rod mounting holes 4 on the outer webs 2 is stopped. This means: first, the rope stop rod mounting holes 4 on one outer web 2 are processed by boring. When the diameter of the rope stop rod mounting holes 4 on one outer web 2 reaches the requirements of the drawing, the processing of the rope stop rod mounting holes 4 on this outer web 2 is stopped. Then, the rope stop rod mounting holes 4 on the other outer web 2 are processed by boring. When the diameter of the rope stop rod mounting holes 4 on the other outer web 2 reaches the requirements of the drawing, the processing of the rope stop rod mounting holes 4 on the other outer web 2 is stopped.

[0065] In the third step, the mandrel includes a first mandrel 11 and a second mandrel 12. The diameter of the first mandrel 11 matches the aperture of the basic hole 41. The diameter of the first mandrel 11 is 0.5-1.5 mm smaller than the aperture of the basic hole 41.

[0066] The diameter of the second spindle 12 matches the diameter of the pulley shaft mounting hole 3, and the diameter of the second spindle 12 is 0.5-1.5 mm smaller than the diameter of the pulley shaft mounting hole 3;

[0067] The number of the spacers 13 is the same as the number of intervals between the intermediate webs 1 , and the axial length of the spacers 13 is the same as the distance between two adjacent intermediate webs 1 as required by the drawings.

[0068] In the third step, the method of first assembling the multiple processed intermediate webs 1 into one piece by using a plurality of mandrels and a plurality of spacers 13 is as follows: first, the matching first mandrel 11 is sequentially passed through the basic holes 41 and the spacers 13 on all the intermediate webs 1, and the spacers 13 are placed at the basic holes 41 of the intermediate webs 1 and sandwiched between adjacent intermediate webs 1. At the same time, the matching second mandrel 12 is sequentially passed through the pulley shaft mounting holes 3 of all the intermediate webs 1.

[0069] In the third step, the use of a plurality of core shafts and a plurality of spacers 13 to string together the two processed outer webs 2 and the welded middle webs 1 means: spot welding a plurality of spacers 13 on adjacent middle webs 1, and at the same time, passing the second core shaft 12 through the pulley shaft mounting holes 3 of the outer web 2 on the left, all the middle webs 1, and the outer web 2 on the right in turn.

[0070] In the sixth step, the distances between the center of the basic hole 41 on each intermediate web 1 and the center of the rope stop rod mounting hole 4 on the outer web 2 are calculated one by one, which means: taking the rope stop rod mounting hole 4 of the outer web 2 as a reference, drawing a cross center line, and measuring the distances from four symmetrical points of the basic hole 41 of the intermediate web 1 to the rope stop rod mounting hole 4, the distances from two longitudinally symmetrical points to the rope stop rod mounting hole 4 are L1 and L2 respectively, and the distances from two transversely symmetrical points to the rope stop rod mounting hole 4 are L3 and L4 respectively;

[0071] In the sixth step, the center distances are finally compared with their theoretical distance values ​​one by one to obtain the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2: the vertical distance between the basic hole 41 of the intermediate web 1 and the center of the rope stop rod mounting hole 4 of the outer web 2 is (L1-L2) / 2, the horizontal distance between the basic hole 41 of the intermediate web 1 and the center of the rope stop rod mounting hole 4 of the outer web 2 is (L3-L4) / 2, and the eccentricity is

[0072]

[0073] In the seventh step, the eccentric sleeve 23 includes an eccentric sleeve inner hole 21 and an outer circular surface 22;

[0074] The eccentricity of the inner hole 21 of the eccentric sleeve is equal to the eccentricity of the basic hole 41 on the corresponding intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2. The diameter and tolerance of the inner hole 21 of the eccentric sleeve are the same as the diameter and tolerance of the rope stop rod mounting hole 4 required by the drawing.

[0075] The outer circumferential surface 22 matches the hole diameter of the corresponding basic hole 41 on the intermediate web 1 .

[0076] In the eighth step, the eccentric sleeve 23 is embedded into the basic hole 41 of the corresponding intermediate web 1, which means that the eccentric sleeve 23 and the basic hole 41 of the corresponding intermediate web 1 are interference fit, and the theoretical cooling time of the eccentric sleeve 23 is calculated according to the interference fit between the outer cylindrical surface 22 and the basic hole 41, and then the eccentric sleeve 23 is cooled according to the theoretical cooling time, and then the cooled eccentric sleeves 23 are embedded one by one into the basic hole 41 of the corresponding intermediate web 1. When the eccentric sleeve 23 returns to normal temperature, the eccentric sleeve 23 and the basic hole 41 of the intermediate web 1 are interference fit.

[0077] Cooling the eccentric sleeves 23 according to the theoretical cooling time and then fitting the cooled eccentric sleeves 23 into the basic holes 41 of the corresponding intermediate webs 1 one by one means: placing the eccentric sleeves 23 into a heat preservation box filled with coolant to cool, taking out the eccentric sleeves 23 after the cooling time is reached, and fitting them into the basic holes 41 of the corresponding intermediate webs 1;

[0078] The interference fit between the outer cylindrical surface 22 of the eccentric sleeve 23 and the base hole 41 is 0.02-0.04 mm.

[0079] The supplementary description of the present invention is as follows:

[0080] The present invention preferably fixes the middle webs 1 and the outer webs 2 into a whole in a group, which means that the webs are stacked on the machine tool workbench, adjusted in position, and pressed and fixed into a whole with a pressing plate to prevent the multiple webs from moving.

[0081] The present invention preferably uses a marking needle to mark the position center lines and contour lines of the pulley shaft mounting hole 3 and the rope stop rod mounting hole 4 on the boom head web.

[0082] The reason why the present invention preferably sets the single-side machining allowance of the pulley shaft mounting hole 3 to 4.5-10 mm is that the diameter of the pulley shaft mounting hole 3 is 9-20 mm smaller than that required by the drawing and is left for finishing.

[0083] In the present invention, the preferred single-side machining allowance of the pulley shaft mounting hole 3 on the middle web 1 and the outer web 2 is 7.5 mm.

[0084] The reason why the diameter of the basic hole 41 on the middle web 1 is preferably 8-10 mm larger than the theoretical diameter of the rope retaining rod mounting hole 4 in the drawings is that the portion larger than the theoretical diameter in the drawings is for the subsequent embedding of the eccentric sleeve 23 .

[0085] In the present invention, the diameter of the basic hole 41 on the middle web 1 is preferably 10 mm larger than the theoretical diameter of the rope retaining rod mounting hole 4 as shown in the drawing.

[0086] The preferred core shaft of the present invention is a shaft-like part passing through the center of the hole, which can be round steel or a steel pipe.

[0087] In the present invention, the diameter of the first mandrel 11 is preferably 1 mm smaller than the diameter of the basic hole 41 on the middle web 1 , and the diameter of the second mandrel 12 is preferably 1 mm smaller than the diameter of the pulley shaft mounting hole 3 .

[0088] In the present invention, the spacer 13 is preferably a steel pipe.

[0089] The preferred coolant of the present invention is liquid nitrogen.

[0090] In the present invention, the theoretical cooling time of the eccentric sleeve 23 is preferably determined according to the maximum radius, thickness, material and type of coolant of the eccentric sleeve 23 .

[0091] In the present invention, the material of the eccentric sleeve 23 is preferably consistent with that of the web.

[0092] The reason why the interference is preferably 0.02-0.04 mm in the present invention is that a too large interference will increase the difficulty of assembly.

[0093] The preferred interference ratio of the present invention is 0.03 mm.

[0094] The present invention preferably processes the rope stop rod mounting hole 4 on the outer web 2 according to the drawing size, and the reason for not installing the eccentric sleeve 23 is that the processing of the rope stop rod mounting hole 4 on the outer web 2 is simpler than that of the rope stop rod mounting hole 4 on the middle web 1, and the rope stop rod mounting hole 4 on the outer web 2 is the reference for the rope stop rod mounting hole 4 on the middle web 1 to be matched with the eccentric sleeve 23, and the rope stop rod mounting hole 4 on the outer web 2 processed by boring has good precision, which will make all the rope stop rod mounting holes 4 on the web more in line with the drawing requirements.

[0095] In the present invention, the inner diameter of the spacer sleeve 13 is preferably greater than or equal to the diameter of the first mandrel 11 .

[0096] In the present invention, the eccentric sleeve 23 is preferably made of round steel or steel pipe, and the inner hole 21 and outer cylindrical surface 22 of the eccentric sleeve of corresponding diameter are turned on a lathe, and the two end surfaces are processed to achieve the required flatness and roughness.

[0097] Example 1:

[0098] See also Figure 1 — Figure 11 A method for processing a multi-hole web of a boom head includes the following steps:

[0099] The first step: the boom head web includes several middle webs 1 and two outer webs 2; first, fix the middle webs 1 in groups on the lathe, and then, according to the drawing, mark the position center lines of the pulley shaft mounting holes 3 and the rope stop rod mounting holes 4 on the middle webs 1 fixed as one, and then, based on the position center lines of the pulley shaft mounting holes 3, perform rough processing of the pulley shaft mounting holes 3 on the middle webs 1 fixed as one; and based on the position center lines of the rope stop rod mounting holes 4, perform basic hole 41 processing on the rope stop rod mounting holes 4 on the middle webs 1 fixed as one, and remove the middle webs 1 after processing is completed. The second step is to fix the two outer webs 2 as a group on the lathe, and then mark the position center line of the pulley shaft mounting hole 3 on the outer web 2 according to the drawing, and then use the position center line of the pulley shaft mounting hole 3 on the outer web 2 as a reference to perform rough processing of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one. After the processing is completed, remove the two outer webs 2; the third step is to use a number of spindles and a number of spacers 13 to string together the multiple pieces of the processed middle webs 1, and then align the middle webs 1 and the boom head, and then weld them to the boom head one by one until they are After all the middle webs 1 are welded, the mandrels and spacers 13 are removed; then several mandrels and several spacers 13 are used to string the two processed outer webs 2 and the welded middle webs 1, and after determining the position, the two outer webs 2 are welded to the outermost left side and the outermost right side of the middle web 1 respectively; the fourth step: first, based on the rough-machined pulley shaft mounting hole 3 as a reference, the theoretical contour lines of the pulley shaft mounting hole 3 are respectively engraved on the outer end surfaces of the two outer webs 2 according to the drawing, and then the center position line of the engraved pulley shaft mounting hole 3 and the theoretical contour line are used as a reference, and the center position line of the engraved pulley shaft mounting hole 3 and the theoretical contour line are used as a reference, and the center position line of the engraved pulley shaft mounting hole 3 is ... , complete the fine processing of the pulley shaft mounting holes 3 on multiple pieces of the middle webs 1 and the two pieces of the outer webs 2, and stop the fine processing when the inner hole diameter of the pulley shaft mounting hole 3 meets the requirements of the drawing; Step 5: First, use the processed pulley shaft mounting hole 3 as a reference, combine with the drawing, and respectively mark the center position line and the outline line of the drawing on the outer end surface of the two pieces of the outer webs 2, and then use the center position line and outline line of the rope stop rod mounting hole 4 on the marked outer webs 2 as a reference to respectively process the rope stop rod mounting holes 4 on the two pieces of the outer webs 2. After the processing is completed, stop processing the rope stop rod mounting holes 4 on the outer webs 2;Step 6: First, take the rope stop rod mounting holes 4 on the two processed outer webs 2 as a reference, and measure the center position of the basic hole 41 on each intermediate web 1 one by one. Then, based on the measured center position of the basic hole 41 on the intermediate web 1 and the center position of the rope stop rod mounting holes 4 on the two outer webs 2, calculate the measured distance between the center of the basic hole 41 on each intermediate web 1 and the center of the rope stop rod mounting hole 4 on the outer web 2 one by one; finally, compare the center distances one by one with their theoretical distance values ​​to obtain the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2; Step 7: According to the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2, and the aperture of each basic hole 41, make an eccentric sleeve 23 compatible with each intermediate web 1; Step 8: embed the above-mentioned eccentric sleeve 23 into the compatible basic hole 41 of the intermediate web 1. ;

[0100] During application, the pulley shaft mounting holes 3 on multiple pieces of middle webs 1 and two pieces of outer webs 2 and the basic holes 41 of the rope stop rod mounting holes on the middle web 1 are rough-machined in groups by lathe turning, and then the pulley shaft mounting holes 3 of multiple pieces of middle webs 1 and two pieces of outer webs 2 and the rope stop rod mounting holes 4 of the outer webs are fine-machined on a boring machine; because the lathe has a fast turning speed and high group processing efficiency, the boring machine processing can improve the accuracy of the hole diameter. By combining the lathe and the boring machine, compared with the existing technology of using only large-scale CNC boring machine processing, the processing efficiency is improved, the processing cycle is shortened, and the processing cost is reduced. At the same time, since the core shaft and spacer are used during welding, the pulley shaft mounting holes 3 of all webs and the rope stop rod mounting holes 4 of the middle web 1 have high coaxiality.

[0101] Example 2:

[0102] The basic content is the same as that of Example 1, except that: in the first step, the rough machining of the pulley shaft mounting hole 3 on the multiple intermediate webs 1 fixed as one refers to: turning the position of the pulley shaft mounting hole 3 on the multiple intermediate webs 1 fixed as one on a lathe until the single-sided machining allowance of the pulley shaft mounting hole 3 on the multiple intermediate webs 1 reaches 4.5-10mm, and then stopping the rough machining of the pulley shaft mounting hole 3 on the intermediate web 1; in the first step, the machining of the basic hole 41 on the rope stop rod mounting hole 4 on the multiple intermediate webs 1 fixed as one refers to: machining the multiple intermediate webs 1 fixed as one on a lathe The position of the rope stop rod mounting hole 4 on the plate 1 is turned until the diameter of the machined hole is 8-10 mm larger than the theoretical diameter of the rope stop rod mounting hole 4 in the drawing, and then the machining is stopped. The machined hole is the basic hole 41; in the second step, the rough machining of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one is performed, which means: turning the position of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one on a lathe until the single-sided machining allowance of the pulley shaft mounting hole 3 on the two outer webs 2 fixed as one reaches 4.5-10 mm, and then the rough machining of the pulley shaft mounting hole 3 on the outer web 2 is stopped.

[0103] During application, when the pulley shaft mounting holes 3 on the grouped middle webs 1 and the grouped outer webs 2 are roughly machined until the single-side allowance reaches 4.5-10mm, the machining is stopped. This facilitates the subsequent fine machining of the pulley shaft mounting holes 3 and improves the aperture accuracy of the pulley shaft mounting holes 3. At the same time, the basic hole 41 of the rope stop rod mounting hole 4 on the middle web 1 is machined. The diameter of the basic hole 41 is 8-10mm larger than the theoretical diameter in the drawing, which facilitates the subsequent installation of the corresponding eccentric sleeve, thereby improving the coaxiality and aperture accuracy of the rope stop rod mounting hole 4.

[0104] Example 3:

[0105] The basic content is the same as Example 1, except that: in the fourth step, completing the fine processing of the pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2 during one clamping process on the boring machine means: during one clamping process on the boring machine, the boring bar is passed through the rough-machined pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2, and at a position close to the pulley shaft mounting holes 3, the boring machine drives the boring bar to rotate to fine-process the pulley shaft mounting holes 3 on the multiple intermediate webs 1 and the two outer webs 2.

[0106] During application, a boring machine is used to fine-machine the pulley shaft mounting holes 3 on the multiple middle webs 1 and the two outer webs 2 welded to the boom head. The fine-machining of the pulley shaft mounting holes 3 of all webs is completed by one processing, so that the coaxiality of the pulley shaft mounting holes 3 on the multiple middle webs 1 and the two outer webs 2 is higher, and the hole diameter accuracy of the pulley shaft mounting holes 3 is higher.

[0107] Example 4:

[0108] The basic content is the same as that of Example 1, except that: in the fifth step, the rope stop rod mounting holes 4 on the two outer webs 2 are processed separately. After the processing is completed, the processing of the rope stop rod mounting holes 4 on the outer webs 2 is stopped, which means: first, the rope stop rod mounting holes 4 on one outer web 2 are processed by boring. When the diameter of the rope stop rod mounting hole 4 on one outer web 2 reaches the requirements of the drawing, the processing of the rope stop rod mounting hole 4 on this outer web 2 is stopped, and then the rope stop rod mounting holes 4 on the other outer web 2 are processed by boring. When the diameter of the rope stop rod mounting hole 4 on the other outer web 2 reaches the requirements of the drawing, the processing of the rope stop rod mounting holes 4 on the other outer web 2 is stopped. In addition, the processing of the rope stop rod mounting holes 4 on the two outer webs 2 can be carried out by turning, drilling, boring, or any one or more combinations thereof.

[0109] When in use, the rope stop rod mounting hole 4 on one outer web 2 is processed first. After completion, the rope stop rod mounting hole 4 on the other outer web 2 is processed. The rope stop rod mounting holes 4 are processed one by one, which reduces the difficulty of processing the rope stop rod mounting holes 4 with smaller diameters and improves the aperture accuracy of the rope stop rod mounting holes 4.

[0110] Example 5:

[0111] The basic content is the same as that of Example 1, except that: in the third step, the spindle includes a first spindle 11 and a second spindle 12, the diameter of the first spindle 11 matches the aperture of the basic hole 41, and the diameter of the first spindle 11 is 0.5-1.5mm smaller than the aperture of the basic hole 41; the diameter of the second spindle 12 matches the aperture of the pulley shaft mounting hole 3, and the diameter of the second spindle 12 is 0.5-1.5mm smaller than the aperture of the pulley shaft mounting hole 3; the number of the spacers 13 is the same as the number of intervals of the intermediate webs 1, and the axial length of the spacers 13 is the same as the spacing between the two adjacent intermediate webs 1 required by the drawing; in the third step, a plurality of spindles and a plurality of spacers 13 are first used to process the multiple pieces. The above-mentioned intermediate webs 1 are assembled into one after completion, which means: first, the matching first spindle 11 is passed through the basic holes 41 and the spacer sleeves 13 on all the intermediate webs 1 in turn, and the spacer sleeves 13 are placed at the basic holes 41 of the intermediate webs 1, clamped between adjacent intermediate webs 1, and at the same time, the matching second spindle 12 is passed through the pulley shaft mounting holes 3 of all the intermediate webs 1 in turn; in the third step, the use of several spindles and several spacer sleeves 13 to string together the two above-mentioned processed outer webs 2 and the welded intermediate webs 1 means: several spacer sleeves 13 are spot welded on adjacent intermediate webs 1, and at the same time, the second spindle 12 is passed through the outer web 2 on the left, all the intermediate webs 1, and the pulley shaft mounting holes 3 of the outer web 2 on the right in turn.

[0112] When in use, first pass the first spindle 11 through the basic hole 41 that has been machined on the middle web 1 and the spacer 13 between the adjacent middle webs 1. At the same time, pass the second spindle 12 through the pulley shaft mounting holes 3 that have been roughly machined on all the middle webs 1, and then string the middle webs 1 together. After aligning with the boom head, weld the middle webs 1 one by one to the boom head. After completing the welding of all the middle webs 1, remove the first spindle 11, the second spindle 12, and the spacer 13; then spot weld the spacer 13 to the adjacent middle web 1, and at the same time, the second spindle 1 2 passes through the pulley shaft mounting hole 3 of the left outer web 2, all the middle webs 1, and the right outer web 2 in sequence, so that the two outer webs 2 are installed in series with all the welded middle webs 1. After determining the position, the two outer webs 2 are welded to the outermost sides of the middle webs 1 respectively. Due to the use of the mandrel, the coaxiality of the pulley shaft mounting hole 3 and the base hole 41 can be better guaranteed. Since the axial length of the spacer 13 is the same as the spacing between the two adjacent middle webs 1 required by the drawing, the spacing between adjacent middle webs 1 can be better guaranteed.

[0113] Example 6:

[0114] The basic content is the same as that of Example 1, except that: in the sixth step, the distance between the center of the basic hole 41 on each intermediate web 1 and the center of the rope stop rod mounting hole 4 on the outer web 2 is calculated one by one, which means: with the rope stop rod mounting hole 4 of the outer web 2 as a reference, a cross center line is drawn, and the distances from the four symmetrical points of the basic hole 41 of the intermediate web 1 to the rope stop rod mounting hole 4 are measured. The distances from the two longitudinally symmetrical points to the rope stop rod mounting hole 4 are L1 and L2 respectively, and the distances from the two transversely symmetrical points to the rope stop rod mounting hole 4 are L1 and L2 respectively. L3 and L4 respectively; in the sixth step, the center distances are finally compared with their theoretical distance values ​​one by one to obtain the eccentricity of the basic hole 41 on each intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2: the vertical distance between the basic hole 41 of the intermediate web 1 and the center of the rope stop rod mounting hole 4 of the outer web 2 is (L1-L2) / 2, the horizontal distance between the basic hole 41 of the intermediate web 1 and the center of the rope stop rod mounting hole 4 of the outer web 2 is (L3-L4) / 2, and the eccentricity In the seventh step, the eccentric sleeve 23 includes an eccentric sleeve inner hole 21 and an outer cylindrical surface 22; the eccentricity of the eccentric sleeve inner hole 21 is equal to the eccentricity of the basic hole 41 on the corresponding intermediate web 1 relative to the rope stop rod mounting hole 4 on the outer web 2, and the diameter and tolerance of the eccentric sleeve inner hole 21 are the same as the diameter and tolerance of the rope stop rod mounting hole 4 required by the drawing; the outer cylindrical surface 22 matches the aperture of the basic hole 41 on the corresponding intermediate web 1; in the eighth step, the eccentric sleeve 23 is embedded in the basic hole 41 of the corresponding intermediate web 1, which means that the eccentric sleeve 23 and the basic hole 41 of the corresponding intermediate web 1 are interference fit. First, the eccentric sleeve 23 is calculated according to the interference fit between the outer cylindrical surface 22 and the basic hole 41. 3's cooling theoretical time, and then cooling the eccentric sleeve 23 according to the theoretical cooling time, and then embedding the cooled eccentric sleeves 23 one by one into the basic hole 41 of the corresponding intermediate web 1. When the eccentric sleeve 23 returns to room temperature, the eccentric sleeve 23 and the basic hole 41 of the intermediate web 1 achieve interference fit; cooling the eccentric sleeve 23 according to the theoretical cooling time, and then embedding the cooled eccentric sleeves 23 one by one into the basic hole 41 of the corresponding intermediate web 1 means: placing the eccentric sleeve 23 into an insulation box filled with coolant to cool it, taking out the eccentric sleeve 23 after the cooling time is reached, and assembling it into the basic hole 41 of the corresponding intermediate web 1; the interference fit between the outer cylindrical surface 22 of the eccentric sleeve 23 and the above-mentioned basic hole 41 is 0.02-0.04mm.

[0115] When applying, first calculate the eccentricity of the basic hole 41 of each intermediate web 1 relative to the rope stop rod mounting hole 4 of the outer web 2, and then combine the eccentricity and the aperture of the basic hole 41 on each intermediate web 1 to make a corresponding eccentric sleeve 23, and then calculate the theoretical cooling time of the eccentric sleeve 23 based on the interference fit amount of 0.02-0.04mm, and put the eccentric sleeve 23 into an insulation box filled with coolant for cooling. After the cooling time is reached, take it out and assemble it into the basic hole 41 of the corresponding intermediate web 1. Since a suitable eccentric sleeve 23 is made for each intermediate web 1, an interference fit is adopted between the outer cylindrical surface 22 of the eccentric sleeve 23 and the inner wall of the basic hole 41, and the diameter and tolerance of the inner hole 21 of the eccentric sleeve are the same as the theoretical diameter and tolerance of the rope stop rod mounting hole 4, thereby ensuring the coaxiality of the rope stop rod mounting hole 4 and the hole distance between the rope stop rod mounting hole 4 and the pulley shaft mounting hole 3.

[0116] Example 7:

[0117] The basic content is the same as Example 6, except that: when measuring the center distance, the rope stop rod mounting hole 4 of an outer web 2 is used as a reference, and the cross center line of the rope stop rod mounting hole 4 is engraved on each intermediate web 1. Then, a rope stop rod or an axis with the same parameters as the rope stop rod is used to pass through the rope stop rod mounting holes 4 on the left and right outer webs 2. Then, a cross section of the rope stop rod or axis is taken at each intermediate web 1, and the distances from the horizontal and vertical symmetrical points of the base hole 41 to the cross section are measured according to the cross center line. Then, the eccentricity of the base hole 41 of each intermediate web 1 relative to the rope stop rod mounting hole 4 of the outer web 2 is calculated based on the vertical distance and the horizontal distance.

[0118] When in use, because the rope stop rod mounting holes 4 of the two outer webs 2 are processed based on the pulley shaft mounting holes 3, and the pulley shaft mounting holes 3 are processed and formed at one time, the positions and cross center lines of the rope stop rod mounting holes 4 on the left and right outer webs 2 are consistent, that is, they overlap when viewed from the side, and the rope stop rod mounting holes 4 of one outer web 2 can be selected as a reference.

[0119] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for processing a multi-hole web of a boom head, characterized by: The method for processing the porous web of the boom head comprises the following steps: Step 1: The boom head web comprises a plurality of intermediate webs (1) and two outer webs (2); first, the plurality of intermediate webs (1) are fixed on a lathe in a group, and then, according to the drawing, the position center lines of the pulley shaft mounting hole (3) and the rope stop rod mounting hole (4) are engraved on the intermediate webs (1) fixed as one, and then, based on the position center line of the pulley shaft mounting hole (3), the pulley shaft mounting hole (3) of the plurality of intermediate webs (1) fixed as one is rough-machined; based on the position center line of the rope stop rod mounting hole (4), the rope stop rod mounting hole (4) on the plurality of intermediate webs (1) fixed as one is machined as a base hole (41), and after the machining is completed, the plurality of intermediate webs (1) are removed; Step 2: First, fix the two outer webs (2) as a group on a lathe, then, according to the drawing, mark the position center line of the pulley shaft mounting hole (3) on the outer web (2), and then, based on the position center line of the pulley shaft mounting hole (3) on the outer web (2), perform rough processing of the pulley shaft mounting hole (3) on the two outer webs (2) fixed as one, and remove the two outer webs (2) after the processing is completed; Step 3: First, use a number of mandrels and a number of spacers (13) to string together the multiple processed intermediate webs (1), then align the assembled intermediate webs (1) with the boom head, and weld them one by one to the boom head until all the intermediate webs (1) are welded, and then remove the mandrels and spacers (13); then use a number of mandrels and a number of spacers (13) to string together the two processed outer webs (2) and the welded intermediate webs (1), and after determining the positions, weld the two outer webs (2) to the outermost sides of the left side and the outermost sides of the right side of the intermediate web (1). Step 4: First, using the rough-machined pulley shaft mounting hole (3) as a reference, respectively carve the theoretical contour lines of the pulley shaft mounting hole (3) on the outer end surfaces of the two outer webs (2) according to the drawing, and then using the carved center position line of the pulley shaft mounting hole (3) and the theoretical contour line as a reference, complete the fine machining of the pulley shaft mounting holes (3) on the multiple intermediate webs (1) and the two outer webs (2) in one clamping process on the boring machine. When the inner hole diameter of the pulley shaft mounting hole (3) reaches the requirements of the drawing, stop the fine machining; Step 5: First, using the processed pulley shaft mounting hole (3) as a reference, in combination with the drawing, respectively mark the center position line and the outline line of the drawing of the rope retaining rod mounting hole (4) on the outer end surface of the two outer webs (2), and then respectively use the center position line and the outline line of the carved rope retaining rod mounting hole (4) on the outer web (2) as a reference to respectively machine the rope retaining rod mounting hole (4) on the two outer webs (2). After the machining is completed, stop machining the rope retaining rod mounting hole (4) on the outer web (2); Step 6: First, using the rope retaining rod mounting holes (4) on the two processed outer webs (2) as references, measure the center position of the basic hole (41) on each intermediate web (1) one by one, and then calculate the distance between the center of the basic hole (41) on each intermediate web (1) and the center of the rope retaining rod mounting holes (4) on the two outer webs (2) obtained by the measurement one by one; finally, compare the center distances one by one with the theoretical distance values ​​to obtain the eccentricity of the basic hole (41) on each intermediate web (1) relative to the rope retaining rod mounting holes (4) on the outer web (2); Step 7: According to the eccentricity of the basic hole (41) on each intermediate web (1) relative to the rope retaining rod mounting hole (4) on the outer web (2), and the aperture of each basic hole (41), an eccentric sleeve (23) adapted to each intermediate web (1) is manufactured; Step 8: embed the eccentric sleeve (23) into the base hole (41) of the corresponding intermediate web (1).

2. The method for processing a multi-hole web of a boom head according to claim 1, characterized in that: In the first step, the rough machining of the pulley shaft mounting holes (3) on the plurality of the intermediate webs (1) fixed as one body is performed by turning the positions of the pulley shaft mounting holes (3) on the plurality of the intermediate webs (1) fixed as one body on a lathe until the single-side machining allowance of the pulley shaft mounting holes (3) on the plurality of the intermediate webs (1) reaches 4.5-10 mm, and then the rough machining of the pulley shaft mounting holes (3) on the intermediate webs (1) is stopped; In the first step, the processing of the basic hole (41) on the rope stop rod mounting hole (4) of the plurality of intermediate webs (1) fixed as one body comprises: turning the position of the rope stop rod mounting hole (4) on the plurality of intermediate webs (1) fixed as one body on a lathe until the diameter of the processed hole is 8-10 mm larger than the theoretical diameter of the rope stop rod mounting hole (4) in the drawing, and then stopping the processing, wherein the processed hole is the basic hole (41); In the second step, the rough machining of the pulley shaft mounting hole (3) on the two outer webs (2) fixed as one body refers to: turning the position of the pulley shaft mounting hole (3) on the two outer webs (2) fixed as one body on a lathe until the single-side machining allowance of the pulley shaft mounting hole (3) on the two outer webs (2) fixed as one body reaches 4.5-10 mm, and then stopping the rough machining of the pulley shaft mounting hole (3) on the outer web (2).

3. The method for processing a multi-hole boom head web according to claim 1, characterized in that: In the fourth step, the finishing of the pulley shaft mounting holes (3) on the plurality of the intermediate webs (1) and the two outer webs (2) during one clamping process on the boring machine means that: during one clamping process on the boring machine, the boring bar is passed through the pulley shaft mounting holes (3) that have been roughly machined on the plurality of the intermediate webs (1) and the two outer webs (2), and the boring machine drives the boring bar to rotate at a position close to the pulley shaft mounting holes (3) to finish the pulley shaft mounting holes (3) on the plurality of the intermediate webs (1) and the two outer webs (2).

4. The method for processing a multi-hole web of a boom head according to claim 1, characterized in that: In the fifth step, the rope stop rod mounting holes (4) on the two outer webs (2) are processed respectively. After the processing is completed, the processing of the rope stop rod mounting holes (4) on the outer webs (2) is stopped. The method includes: firstly processing the rope stop rod mounting holes (4) on one outer web (2) by boring, and when the diameter of the rope stop rod mounting holes (4) on one outer web (2) reaches the requirements of the drawing, stopping the processing of the rope stop rod mounting holes (4) on this outer web (2), and then processing the rope stop rod mounting holes (4) on the other outer web (2) by boring, and when the diameter of the rope stop rod mounting holes (4) on the other outer web (2) reaches the requirements of the drawing, stopping the processing of the rope stop rod mounting holes (4) on the other outer web (2).

5. A method for processing a multi-hole web of a boom head according to any one of claims 1 to 4, characterized in that: In the third step, the mandrel includes a first mandrel (11) and a second mandrel (12), the diameter of the first mandrel (11) matches the aperture of the basic hole (41), and the diameter of the first mandrel (11) is 0.5-1.5 mm smaller than the aperture of the basic hole (41); The diameter of the second spindle (12) matches the diameter of the pulley shaft mounting hole (3), and the diameter of the second spindle (12) is 0.5-1.5 mm smaller than the diameter of the pulley shaft mounting hole (3); The number of the spacers (13) is the same as the number of intervals between the intermediate webs (1), and the axial length of the spacers (13) is the same as the spacing between two adjacent intermediate webs (1) required by the drawings.

6. The method for processing multiple holes in the web of the boom head according to claim 5, characterized in that: In the third step, the method of first assembling the above-mentioned intermediate webs (1) after multiple processing by using a plurality of mandrels and a plurality of spacers (13) is as follows: first, the matching first mandrel (11) is sequentially passed through the basic holes (41) and the spacers (13) on all the intermediate webs (1), and the spacers (13) are placed at the basic holes (41) of the intermediate webs (1) and clamped between adjacent intermediate webs (1). At the same time, the matching second mandrel (12) is sequentially passed through the pulley shaft mounting holes (3) of all the intermediate webs (1); In the third step, the method of using a plurality of mandrels and a plurality of spacers (13) to string together the two processed outer webs (2) and the welded intermediate webs (1) is as follows: a plurality of spacers (13) are spot-welded on adjacent intermediate webs (1), and at the same time, the second mandrel (12) is sequentially passed through the pulley shaft mounting holes (3) of the outer web (2) on the left, all the intermediate webs (1), and the outer web (2) on the right.

7. The method for machining multiple holes in the web of the boom head according to claim 1, characterized in that: In the sixth step, the distance between the center of the basic hole (41) on each intermediate web (1) and the center of the rope stop rod mounting hole (4) on the outer web (2) is calculated one by one, which means: with the rope stop rod mounting hole (4) of the outer web (2) as a reference, a cross center line is drawn, and the distances from four symmetrical points of the basic hole (41) of the intermediate web (1) to the rope stop rod mounting hole (4) are measured, and the distances from two longitudinally symmetrical points to the rope stop rod mounting hole (4) are L1 and L2 respectively, and the distances from two transversely symmetrical points to the rope stop rod mounting hole (4) are L3 and L4 respectively; In the sixth step, the center distances are finally compared with the theoretical distance values ​​one by one to obtain the eccentricity of the basic hole (41) on each intermediate web (1) relative to the rope retaining rod mounting hole (4) on the outer web (2). The vertical distance between the basic hole (41) of the intermediate web (1) and the center of the rope retaining rod mounting hole (4) of the outer web (2) is (L1-L2) / 2, the horizontal distance between the basic hole (41) of the intermediate web (1) and the center of the rope retaining rod mounting hole (4) of the outer web (2) is (L3-L4) / 2, and the eccentricity is (L1-L2) / 2. .

8. The method for machining multiple holes in the boom head web according to claim 1, characterized in that: In the seventh step, the eccentric sleeve (23) includes an eccentric sleeve inner hole (21) and an outer cylindrical surface (22); The eccentricity of the inner hole (21) of the eccentric sleeve is equal to the eccentricity of the basic hole (41) on the corresponding intermediate web (1) relative to the rope retaining rod mounting hole (4) on the outer web (2), and the diameter and tolerance of the inner hole (21) of the eccentric sleeve are the same as the diameter and tolerance of the rope retaining rod mounting hole (4) required by the drawing; The outer circular surface (22) matches the aperture of the corresponding basic hole (41) on the intermediate web (1).

9. The method for machining multiple holes in the boom head web according to claim 8, characterized in that: In the eighth step, the eccentric sleeve (23) is embedded in the basic hole (41) of the corresponding intermediate web (1), which means that the eccentric sleeve (23) and the basic hole (41) of the corresponding intermediate web (1) are interference-fitted. First, the theoretical cooling time of the eccentric sleeve (23) is calculated according to the interference fit between the outer cylindrical surface (22) and the basic hole (41), and then the eccentric sleeve (23) is cooled according to the theoretical cooling time. Then, the cooled eccentric sleeves (23) are embedded one by one in the basic hole (41) of the corresponding intermediate web (1). When the eccentric sleeve (23) returns to normal temperature, the eccentric sleeve (23) and the basic hole (41) of the intermediate web (1) are interference-fitted.

10. The method for processing multiple holes in the web of the boom head according to claim 9, characterized in that: The step of cooling the eccentric sleeve (23) according to the theoretical cooling time and then fitting the cooled eccentric sleeves (23) into the basic holes (41) of the corresponding intermediate webs (1) one by one means: placing the eccentric sleeve (23) into a heat preservation box filled with a coolant for cooling, taking out the eccentric sleeve (23) after the cooling time is reached, and fitting it into the basic holes (41) of the corresponding intermediate webs (1); The interference fit between the outer cylindrical surface (22) of the eccentric sleeve (23) and the base hole (41) is 0.02-0.04 mm.

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